Updated on 2024/05/27

写真a

 
IIMURA Yasuo
 
Organization
Faculty of Environmental Science
Department
School of Environmental Science Department of Biological Resources Management
Title
Lecturer
External link

Message

  • I research how various components within the soil move and what roles they play, based on the biogeochemistry. Also, while deepening our understanding of the mechanisms of nature, I explore ways to utilize these components in agriculture in an environmentally friendly manner.

Degree

  • 博士(農学) ( 2011.3   神戸大学 )

Research Field

  • Soil science

  • Ecosystem ecology

  • Biogeochemistry

  • Priming effect

  • Biochar

Research Experience

  • The University of Shiga Prefecture   School of Environmental Science Department of Biological Resources Management   Lecturer

    2019.4

  • The University of Shiga Prefecture   School of Environmental Science Department of Biological Resources Management   Assistant Professor

    2013.11 - 2019.3

Association Memberships

  • International Humic Substances Society

    2017.4

  • 日本腐植物質学会

    2006.8

  • 日本土壌肥料学会

    2005.8

Research Areas

  • Life Science / Plant nutrition and soil science

  • Environmental Science/Agriculture Science / Environmental dynamic analysis

  • Life Science / Ecology and environment

Committee Memberships

  •   Soil Science and Plant Nutrition編集委員  

    2023.10   

  •   日本腐植物質学会会計監査  

    2023.1   

Available Technology

  • 土壌から地球温暖化問題を考える

Papers

  • Biomass recovery of coastal young mangrove plantations in Central Thailand

    Toshiyuki Ohtsuka, Suthathip Umnouysin, Vilanee Suchewaboripont, Nada Yimatsa, Chadtip Rodtassana, Morimaru Kida, Yasuo Iimura, Shinpei Yoshitake, Nobuhide Fujitake, Sasitorn Poungparn

    Scientific Reports   14 ( 1 )   2024.5

     More details

    Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media LLC  

    Abstract

    Around one-third of the world’s most carbon-rich ecosystems, mangrove forests, have already been destroyed in Thailand owing to coastal development and aquaculture. Improving these degraded areas through mangrove plantations can restore various coastal ecosystem services, including CO<sub>2</sub> absorption and protection against wave action. This study examines the biomass of three coastal mangrove plantations (Avicennia alba) of different ages in Samut Prakarn province, Central Thailand. Our aim was to understand the forest biomass recovery during the early stages of development, particularly fine root biomass expansion. In the chronosequence of the mangrove plantations, woody biomass increased by 40% over four years from 79.7 ± 11.2 Mg C ha<sup>-1</sup> to 111.7 ± 12.3 Mg C ha<sup>−1</sup>. Fine root biomass up to a depth of 100 cm was 4.47 ± 0.33 Mg C ha<sup>−1</sup>, 4.24 ± 0.63 Mg C ha<sup>−1</sup>, and 6.92 ± 0.32 Mg C ha<sup>−1</sup> at 10, 12, and 14 year-old sites, respectively. Remarkably, the fine root biomass of 14-year-old site was significantly higher than those of the younger sites due to increase of the biomass at 15–30 cm and 30–50 cm depths. Our findings reveal that the biomass recovery in developing mangrove plantations exhibit rapid expansion of fine roots in deeper soil layers.

    DOI: 10.1038/s41598-024-61979-3

    Other Link: https://www.nature.com/articles/s41598-024-61979-3

  • Decrease in Inorganic Nitrogen and Net Nitrogen Transformation Rates with Biochar Application in a Warm-Temperate Broadleaved Forest Reviewed

    2024

  • The Nitrogen Cycle of a Cool-Temperate Deciduous Broad-Leaved Forest Reviewed

    Ruoming Cao, Siyu Chen, Shinpei Yoshitake, Takeo Onishi, Yasuo Iimura, Toshiyuki Ohtsuka

    2024

  • Effect of livestock manure and compost on the quality and quantity of humic substances in soil Reviewed

    Kato T, Kondo M, Iimura Y, Ohshima H, Maeda Y, Fujitake N

    Humic Substances Research   19   9 - 15   2023

     More details

    Language:English  

  • Organic carbon stock and composition in 3.5-m core mangrove soils (Trat, Thailand) Reviewed

    Kida M, Watanabe I, Kinjo K, Kondo M, Yoshitake S, Tomotsune M, Iimura Y, Umnouysin S, Suchewaboripont V, Poungparn S, Ohtsuka T, Fujitake N

    Science of the Total Environment   801   149682 - 149682   2021.12

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Science of the Total Environment  

    Mangroves are increasingly recognized as an important component of regional and global carbon cycles especially for their high carbon storage capacity. Global estimation of mangrove soil organic carbon (SOC) storage requires detailed regional studies, but estimates of SOC data in deep soils are currently missing in many countries. Furthermore, little is explored on the molecular composition of mangrove SOC. Here, we assessed the SOC stock in a Trat mangrove forest (Thailand) by collecting deep soils (3.5 m) and analyzed the SOC composition for better understanding its potential sources and influencing factors. The Trat mangrove forest had four times higher SOC stock than has been considered for Thai mangrove forests, with the per-area SOC stock of nearly 1000 Mg C ha–1 which rivals that of Indo-Pacific mangrove forests. The SOC composition analyzed by C/N ratios and spectroscopic techniques differed by tree species and depth. Compositional data principal component analysis revealed that a biological factor (root abundance) had stronger influences than the soil texture (sand versus clay) on the abundance and composition of mangrove SOC. Although surface soil (~1 m) C density was largely controlled by the recent vegetation, deep soil C density reflected other historical processes. This study contributed to a refined estimate of Thailand mangrove SOC stock and revealed that factors influencing SOC abundance and composition differ by tree species and depth.

    DOI: 10.1016/j.scitotenv.2021.149682

    Scopus

  • Plant Species and biomass, soil respiration, soil environment data on Whapmagoostui-Kuujjuarapik, Quebec, Canada Reviewed

    Masumoto S, Kitagawa R, Nishizawa K, Kaneko R, Osono T, Hasegawa M, Iimura Y, Moti AS, Uchida M

    Polar Data Journal   5   80 - 88   2021

  • Lateral export of dissolved inorganic and organic carbon from a small mangrove estuary with tidal fluctuation Reviewed

    Ohtsuka T, Onishi T, Yoshitake S, Tomotsune M, Kida M, Iimura Y, Kondo M, Suchewaboripont V, Cao R, Kinjo K, Fujitake N

    Forests   11 ( 10 )   1 - 15   2020.10

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Forests  

    © 2020 by the authors. Licensee MDPI, Basel, Switzerland. The significance of aquatic lateral carbon (C) export in mangrove ecosystems highlights the extensive contribution of aquatic pathways to the net ecosystem carbon budget. However, few studies have investigated lateral fluxes of dissolved organic carbon (DOC) and inorganic carbon (DIC), partly due to methodological difficulty. Therefore, we evaluated area-based lateral C fluxes in a small mangrove estuary that only had one exit for water exchange to the coast. We sampled water from the mouth of the creek and integrated discharge and consecutive concentration of mangrove-derived C (∆C). Then, we estimated the area-normalized C fluxes based on the inundated mangrove area. DIC and DOC concentrations at the river mouth increased during ebb tide during both summer and winter. We quantified the ∆C in the estuary using a two-component conservative mixing model of freshwater and seawater. DIC and DOC proportions of ∆C concentrations at the river mouth during ebb tide was between 34% and 56% in the winter and 26% and 42% in the summer, respectively. DIC and DOC fluxes from the estuary were estimated to be 1.36 g C m−2 d−1 and 0.20 g C m−2 d−1 in the winter and 3.35 g C m−2 d−1 and 0.86 g C m−2 d−1 in the summer, respectively. Based on our method, daily fluxes are mangrove area-based DIC and DOC lateral exports that can be directly incorporated into the mangrove carbon budget.

    DOI: 10.3390/f11101041

    Scopus

  • Integrative assessment of the effects of shrub coverage on soil respiration in a tundra ecosystem Reviewed

    Masumoto S, Kitagawa R, Nishizawa K, Osono T, Hasegawa M, Iimura Y, Matsuoka S, Kaneko R, Uchida M, Mori A.S

    Polar Science   27   2020

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Polar Science  

    © 2020 Elsevier B.V. and NIPR Shrub encroachment and soil respiration (SR) are predicted to increase in the tundra ecosystem under climate warming, but little is known regarding potential causal relationships between shrubs and SR at a local scale. Multiple and complex belowground processes exist between the two phenomena, and consolidation is logistically difficult. Our study aimed to identify and integrate multiple belowground processes to elucidate the impact of shrub coverage on SR, using structural equation modeling (SEM). Results indicated that shrub coverage enhanced SR through root biomass, fungal community composition and soil temperature. SEM also revealed a potential indirect effect via interactions among those soil factors. Soil factors relating heterotrophic respiration affected on SR through more complex interaction among the factors. However, total effect sizes on SR were similar between factors relating autotrophic respiration and that relating heterotrophic respiration, suggesting that SR increases with shrub coverage would be unlikely to result from decreases in soil organic matter.

    DOI: 10.1016/j.polar.2020.100562

    Web of Science

    Scopus

  • The mineralization rate of black soil carbon in the deep layers of Japanese volcanic ash soil may be easily accelerated by labile carbon supply Reviewed

    Iimura Y, Tanaka D, Nagao S, Fujitake N, Ohtsuka T

    Soil Science and Plant Nutrition   2020

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Soil Science and Plant Nutrition  

    © 2020, © 2020 Japanese Society of Soil Science and Plant Nutrition. The stability of black soil carbon in the deep layers of Japanese volcanic ash soil (i.e., buried A horizons) is often explained by its unique chemical (molecular structure) and physical (associated with short-range-order minerals) recalcitrance. However, the stability of black soil C in buried A horizons may be changed by labile C supply for soil microbes. Here, we hypothesized that the mineralization of black soil C in buried A horizons of Japanese volcanic ash soil could be easily accelerated by a supply of labile C (i.e., a priming effect; PE). To test our hypothesis, we investigated the direction and magnitude of the PE with a buried A horizon in Japan using 13C-labeled glucose (2.188 atom %) in a short-term (21 days) incubation study. We also investigated the effect of mineral nitrogen (N), which could contribute to microbial activity in this incubation study. We found that a positive PE occurred by glucose supply with (182%) or without (181%) mineral N input over the 21-day incubation, and its values were very similar to the PE ratios previously reported in other deep soils. The estimated mean residence time (MRT) of black soil C considering PE was clearly accelerated by glucose supply, regardless of mineral N input, compared with the initial soil MRT. These results strongly support our hypothesis that the mineralization rate of black soil C in buried A horizons is easily accelerated by a labile C supply, and it also demonstrates important implications for the effects of global warming on buried A horizons (e.g., increased root exudation, fine root biomass supply, and N deposition) in Japanese volcanic ash soils.

    DOI: 10.1080/00380768.2020.1753481

    Scopus

  • Spatial variation of soil net nitrogen mineralization and nitrification in an old-growth beech-oak forest on Mt. Hakusan Reviewed

    2019.8

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

  • Effects of dense understory dwarf bamboo (Sasa senanensis) on net nitrogen mineralization at a Japanese volcanic ash soil in a cool-temperate deciduous broadleaved forest Reviewed

    2019.7

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

  • Stand dynamics and aboveground net primary productivity of a mature subtropical mangrove forest on Ishigaki Island, south-western Japan Reviewed

    Ohtsuka T, Tomotsune M, Suchewaboripont V, Iimura Y, Kida M, Yoshitake S, Kondo M, Kinjo K

    Regional Studies in Marine Science   27   2019.3

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Regional Studies in Marine Science  

    © 2019 Elsevier B.V. There are insufficient data regarding forest productivity of mature mangroves near the northern limit of mangrove distribution in subtropical East Asia. We conducted the present study to determine the stand dynamics and net primary production (NPP) of a mature mangrove forest on Ishigaki Island in south-western Japan over three successive years, using a large permanent plot. The two mangrove species present were Bruguiera gymnorrhiza and Rhizophora stylosa. The aboveground biomass in the plot was high, despite the high latitude (24 ∘ 29 ′ N) of the site, gradually increasing from 158.4 Mg ha −1 to 164.6 Mg ha −1 over the three-year study period. This increase was attributable to an increase in the biomass of B. gymnorrhiza. The biomass of R. stylosa, however, decreased during the same period because of a threefold-higher mortality rate and a lower relative growth rate of this species compared with B. gymnorrhiza. The mangrove forest was in the late successional stage, following a pioneer R. stylosa forest that was widely distributed throughout the study plot as standing dead trees and logs. The aboveground NPP of the mangrove forest was 10.66 ± 1.46

    DOI: 10.1016/j.rsma.2019.100516

    Scopus

  • Soil carbon stocks and their primary origin at mature mangrove ecosystems in the estuary of Fukido River, Ishigaki Island, southwestern Japan Reviewed

    Iimura Y, Kinjo K, Kondo M, Ohtsuka T

    Soil Science and Plant Nutrition   65 ( 5 )   435 - 443   2019

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Soil Science and Plant Nutrition  

    © 2019, © 2019 Japanese Society of Soil Science and Plant Nutrition. Mangrove ecosystems play an important role in carbon (C) accumulation in tropical and subtropical regions. Below-ground deep anoxic soil is especially important for C accumulation. However, quantitative data on below-ground soil C stocks in mangrove ecosystems are lacking compared with data on above-ground biomass. In addition, soil C accumulation processes in mangrove ecosystems have not been sufficiently clarified. In this study, we quantified soil C stocks and focused on the mass of fallen litter and below-ground roots, which are produced by tree and that may directly influence soil C stocks in a mature subtropical mangrove in the estuary of Fukido River, Ishigaki Island, southwestern Japan. The principal species in this study site were Bruguiera gymnorhiza and Rhizophora stylosa, and total above-ground biomass at the site was 80.7 ± 1.3 (mean ± SD) Mg C ha−1 over the period from 2014 to 2016. Litter was collected in six litter traps from May 2013 to November 2016, it ranged from 7.8 to 11.5 Mg C ha−1, with the major proportion of litter being from foliage (leaves and stipules). The root C density at 90

    DOI: 10.1080/00380768.2019.1660589

    Scopus

  • Harmonized data on early stage litter decomposition using tea material across Japan Reviewed

    Satoshi N. Suzuki, Mioko Ataka, Ika Djukic, Tsutomu Enoki, Karibu Fukuzawa, Mitsuru Hirota, Takuo Hishi, Tsutom Hiura, Kazuhiko Hoshizaki, Hideyuki Ida, Akira Iguchi, Yasuo Iimura, Takeshi Ise, Tanaka Kenta, Yoshifumi Kina, Hajime Kobayashi, Yuji Kominami, Hiroko Kurokawa, Kobayashi Makoto, Michinari Matsushita, Rie Miyata, Hiroyuki Muraoka, Tatsuro Nakaji, Masahiro Nakamura, Shigeru Niwa, Nam J. Noh, Takanori Sato, Tatsuyuki Seino, Hideaki Shibata, Ryo O. Suzuki, Koichi Takahashi, Tomonori Tsunoda, Tasuhiro Ustumi, Kenta Watanabe

    Ecological Research   34   575 - 576   2019

  • Priming effect of Miscanthus sinensis derived biochar on brown forest soil Reviewed

    Iimura Y, Natsuhara M, Ohtsuka T, Tomotsune M, Yoshitake S, Koizumi H

    Soil Science and Plant Nutrition   65 ( 6 )   550 - 556   2019

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Soil Science and Plant Nutrition  

    © 2019, © 2019 Japanese Society of Soil Science and Plant Nutrition. The role of biochar in the mitigation of CO2 emissions has been extensively studied in agricultural soils but is not well understood in Japanese forest soils, especially in relation to CO2 emissions from applied biochar and native soil C (i.e., the priming effect; PE). We hypothesized that the type of biochar and/or the application method (mixed or sprinkled) affect the direction and magnitude of PE in forest soil, and in particular, negative PE can be achieved relatively easily if biochar produced under higher temperature conditions were sprinkled on the soil surface. To test our hypothesis, we measured CO2 emissions from biochar-amended brown forest soil in Japan and examined its PE by conducting a medium-term (~4 months) incubation study. As substrates, we used plain straw from the C4 grass Miscanthus sinensis (SU) and two qualities of biochar produced from it at either 300°C (BC300) or 800°C (BC800) and compared two application methods: mixed into or sprinkled onto the soil. BC800 had a greater C content and C:N ratio as well a lower volatile matter content and higher nonvolatile matter content than BC300

    DOI: 10.1080/00380768.2019.1672101

    Scopus

  • Priming effect of the addition of maize to a Japanese volcanic ash soil and its temperature sensitivity: a short-term incubation study Reviewed

    Iimura Y, Tabara I, Izumitsu K, Fujitake N

    Soil Science and Plant Nutrition   2019

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Soil Science and Plant Nutrition  

    © 2019, © 2019 Japanese Society of Soil Science and Plant Nutrition. The response of soil organic matter (SOM) to global warming is a crucial subject. However, the temperature sensitivity of SOM turnover remains largely uncertain. Changes in the mineralization of native SOM, i.e., priming effect (PE) may strongly affect the temperature sensitivity of SOM turnover in the presence of global warming. We investigated the direction and magnitude of the PE in a Japanese volcanic ash soil at different temperatures (15°C, 25°C, and 35°C) using a natural 13C tracer (C4-plant, maize leaf) in a short-term (25 days) incubation study. In addition, we evaluated the temperature sensitivity expressed as Q10 value with and without the addition of maize to the soil and their relations to PE. We found that positive PE occurred at each temperature condition and tended to increase with decreased temperature, and these PE results were consistent with the microbial biomass at the end of the incubation period. CO2 emission from control soil (without maize) increased with increasing temperature (Q10 = 2.6), but CO2 emission from the soil with added maize did not significantly change with increasing te

    DOI: 10.1080/00380768.2019.1665969

    Scopus

  • Contribution of humic substances to dissolved organic matter optical properties and iron mobilization Reviewed

    Morimaru Kida, Nobuhide Fujitake, Vilanee Suchewaboripont, Sasitorn Poungparn, Mitsutoshi Tomotsune, Miyuki Kondo, Shinpei Yoshitake, Yasuo Iimura, Kazutoshi Kinjo, Chatree Maknual, Toshiyuki Ohtsuka

    Aquatic Sciences   80 ( 3 )   2018.7

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Birkhauser Verlag AG  

    Humic substances (HS) are the primary constituents of dissolved organic matter (DOM) and play pivotal roles in aquatic systems. Optical indices of DOM, such as specific UV absorbance (SUVA254), the fluorescence index (FI) and biological index (BIX), have gained wide interest because of their ease of use. In this study, we explored the relationship between HS and the indices in the Trat River Basin (eastern Thailand) from headwaters to the river mouth through the distinct dry and rainy seasons to examine whether changes in index values reflect variability in the relative contribution of HS to DOM, or %HS. The results show that %HS and the indices did not exhibit significant linear relationships (FI and BIX, P &gt
    0.05), or the relationships changed seasonally (SUVA254). However, analyzing the indices versus %HS did show clear DOM composition changes by season with more humic-like or terrestrial material in the rainy season. Relationships between DOM and dissolved iron (dFe) concentrations were also explored. Separating the relationships of DOM versus dFe into HS versus dFe and non-HS versus dFe provides us the opportunity to better understand which fraction contributes more to dFe mobilization. The results indicate stronger positive linear relationships between HS and dFe concentrations independent of river tributary. Overall, this study highlights the importance of quantifying HS for the study of DOM dynamics or compositional changes along a river transect as well as for DOM-induced iron mobilization.

    DOI: 10.1007/s00027-018-0578-z

    Scopus

  • Soil microbial succession along a chronosequence on a High Arctic glacier foreland, Ny-Ålesund, Svalbard: 10 years’ change Reviewed

    Shinpei Yoshitake, Masaki Uchida, Yasuo Iimura, Toshiyuki Ohtsuka, Takayuki Nakatsubo

    Polar Science   16   59 - 67   2018.6

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Elsevier B.V.  

    Rapid glacial retreat in the High Arctic causes the expansion of new habitats, but the successional trajectories of soil microbial communities are not fully understood. We examined microbial succession along a chronosequence twice with a 10-year interval in a High Arctic glacier foreland. Soil samples were collected from five study sites with different ages and phospholipid fatty acids analysis was conducted to investigate the microbial biomass and community structure. Microbial biomass did not differ significantly between the two sampling times but tended to increase with the chronosequence and showed a significant correlation with soil carbon (C) and nitrogen (N) content. Microbial community structure clearly differed along the chronosequence and was correlated with C and N content. The largest shift in community structure over 10 years was observed in the newly exposed sites after deglaciation. The accumulation of soil organic matter was regarded as an important determinant both of microbial biomass and community structure over the successional period. In contrast, the initial microbial community on the newly exposed soil changed rapidly even in the High Arctic, suggesting that some key soil processes such as C and N cycling can also shift within the relatively short period after rapid glacial retreat.

    DOI: 10.1016/j.polar.2018.03.003

    Scopus

  • Effects of soil temperature and tidal condition on variation in CO2 flux from soil sediment in a subtropical mangrove forest Reviewed

    Tomotsune M, Yoshitake S, Iimura Y, Kida M, Fujitake N, Koizumi H, Ohtsuka T

    Journal of Tropical Ecology   34 ( 268 )   275   2018

  • Dissolved organic carbon (DOC) input to the soil: DOC fluxes and their partitions during the growing season in a cool-temperate broad-leaved deciduous forest, central Japan Reviewed

    Siyu Chen, Shinpei Yoshitake, Yasuo Iimura, Chiyuki Asai, Toshiyuki Ohtsuka

    ECOLOGICAL RESEARCH   32 ( 5 )   713 - 724   2017.9

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:SPRINGER JAPAN KK  

    Dissolved organic carbon (DOC) plays an important role in C cycling in forest ecosystems. Here we measured the concentrations and fluxes of DOC in a cool-temperate broad-leaved deciduous forest (Takayama Forest) to quantify the contribution of DOC from different forest water flux conditions. Mean DOC concentration during the growing season increased in the sequence from bulk precipitation (2.98 +/- 0.45 mg L-1), throughfall above dwarf bamboo (6.84 +/- 0.45 mg L-1), throughfall below dwarf bamboo (7.08 +/- 0.42 mg L-1), stemflow (15.05 +/- 0.98 mg L-1), and litter leachate (21.33 +/- 1.01 mg L-1). Litter leachate DOC concentration, being high in spring and autumn, which was fairly correlated with the amount of litterfall of bamboo and trees. In stemflow, the DOC concentration was high during early summer and gradually decreased, in addition, it also showed dramatic variation among different plant species. Litter leachate (72.5%) accounted for most of the DOC input to the soil during the growing season (311.5 kg C ha(-1) 7 months(-1)), while stemflow (1.6%) contributed the least. A great quantity of precipitation at the study site was associated with a subsequent high atmospheric contribution of DOC flux (8.6%), which was more than half of throughfall (16.5%). The high input of DOC to the soil and andisol soil characteristics at the Takayama Forest suggest that the DOC fluxes are vital to the soil carbon sequestration. Therefore, DOC fluxes should be taken into account when the carbon balance is assessed at forest ecosystems.

    DOI: 10.1007/s11284-017-1488-6

    Web of Science

    Scopus

  • High salinity leads to accumulation of soil organic carbon in mangrove soil Reviewed

    Morimaru Kida, Mitsutoshi Tomotsune, Yasuo Iimura, Kazutoshi Kinjo, Toshiyuki Ohtsuka, Nobuhide Fujitake

    CHEMOSPHERE   177   51 - 55   2017

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:PERGAMON-ELSEVIER SCIENCE LTD  

    Although mangrove forests are one of the most well-known soil organic carbon (SOC) sinks, the mechanism underlying SOC accumulation is relatively unknown. High net primary production (NPP) along with the typical bottom-heavy biomass allocation and low soil respiration (SR) have been considered to be responsible for SOC accumulation. However, an emerging paradigm postulates that SR is severely underestimated because of the leakage of dissolved inorganic carbon (DIC) in groundwater. Here we propose a simple yet unique mechanism for SOC accumulation in mangrove soils. We conducted sequential extraction of water extractable organic matter (WEOM) from mangrove soils using ultrapure water and artificial seawater, respectively. A sharp increase in humic substances (HS) concentration was observed only in the case of ultrapure water, along with a decline in salinity. Extracted WEOM was colloidal, and &lt;= 70% of it re-precipitated by the addition of artificial seawater. These results strongly suggest that HS is selectively flocculated and maintained in the mangrove soils because of high salinity. Because sea salts are a characteristic of any mangrove forest, high salinity may be one of mechanisms underlying SOC accumulation in mangrove soils. (C), 2017 Published by Elsevier Ltd.

    DOI: 10.1016/j.chemosphere.2017.02.074

    Web of Science

    Scopus

  • Spatial Upscaling of Soil Respiration under a Complex Canopy Structure in an Old-Growth Deciduous Forest, Central Japan Reviewed

    Vilanee Suchewaboripont, Masaki Ando, Shinpei Yoshitake, Yasuo Iimura, Mitsuru Hirota, Toshiyuki Ohtsuka

    FORESTS   8 ( 2 )   2017

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:MDPI AG  

    The structural complexity, especially canopy and gap structure, of old-growth forests affects the spatial variation of soil respiration (Rs). Without considering this variation, the upscaling of Rs from field measurements to the forest site will be biased. The present study examined responses of Rs to soil temperature (Ts) and water content (W) in canopy and gap areas, developed the best fit model of Rs and used the unique spatial patterns of Rs and crown closure to upscale chamber measurements to the site scale in an old-growth beech-oak forest. Rs increased with an increase in Ts in both gap and canopy areas, but the effect of W on Rs was different between the two areas. The generalized linear model (GLM) analysis identified that an empirical model of Rs with the coupling of Ts and W was better than an exponential model of Rs with only Ts. Moreover, because of different responses of Rs to W between canopy and gap areas, it was necessary to estimate Rs in these areas separately. Consequently, combining the spatial patterns of Rs and the crown closure could allow upscaling of Rs from chamber-based measurements to the whole site in the present study.

    DOI: 10.3390/f8020036

    Web of Science

    Scopus

  • Change in biomass of an old-growth beech-oak forest on the eastern slope of Mt. Hakusan over a 17-year period. Reviewed

    Suchewaboripont V, Iimura Y, Yoshitake S, Kato S, Komiyama A, Ohtsuka T

    Journal of Forest Environment   2015

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  • The effect of canopy structure on soil respiration in an old-growth beech forest in central Japan. Reviewed

    Suchewaboripont V, Ando M, Iimura Y, Yoshitake S, Ohtsuka T

    Ecological Research   2015

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  • Role of coarse woody debris in the carbon cycle of Takayama forest, central Japan. Reviewed

    Ohtsuka T, Shizu Y, Hirota M, Yashiro Y, Jia S, Iimura Y, Koizumi H

    Ecological Research   2014

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  • Investigations of environmental changes based on chemical analyses of humic substances. Reviewed

    Kawahigashi M, Ono K, Iimura Y, Fujitake N

    Humic Substances Research   2013

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  • Carbon cycling and sequestration in a Japanese red pine (Pinus densiflora) forest on lava flow of Mt Fuji. Reviewed

    Ohtsuka T, Negishi M, Sugita K, Iimura Y, Hirota M

    Ecological Research   2013

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Participation form:Joint(The vice charge)  

  • Comparison of quantity and quality of soil organic carbon between matured and gap areas in an old-growth beech forest. Reviewed

    Iimura Y, Hirota M, Ida H, Ohtsuka T

    Journal of Geography   2013

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Participation form:Joint(The main charge)  

  • Investigation of the composition and origin of particle organic matter in a forested river. Reviewed

    Li W, Numata T, Kobayashi S, Yamada T, Li F, Ohtsuka T, Iimura Y

    Journal of Water and Environment Technology   2013

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Participation form:Joint(The vice charge)  

  • Black humic acid dynamics during natural reforestation of Japanese pampas grass (Miscanthus sinensis). Reviewed

    Iimura Y, Fujimoto M, Tamura K, Higashi T, Kondo M, Uchida M, Yonebayashi K, Fujitake N

    Soil Biology and Biochemistry   2013

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Participation form:Joint(The main charge)  

  • Characterization of DAX-8 adsorbed soil fulvic acid fractions by various types of analyses. Reviewed

    Iimura Y, Ohtani T, Chersich S, Tani M, Fujitake N

    Soil Science and Plant Nutrition   2012

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  • The effect of dense dwarf bamboo (Sasa senanensis) understory on soil respiration before and after clearcutting of cool temperate deciduous broad-leaved forest. Reviewed

    Yashiro Y, Shizu Y, Adachi T, Ohtsuka T, Lee N, Iimura Y, Koizumi H

    Ecological Research   2012

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  • Molecular size fractionation of soil humic acids using preparative high performance size-exclusion chromatography. Reviewed

    Asakawa D, Iimura Y, Kiyota T, Yanagi Y, Fujitake N

    Journal of Chromatography A   2011

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  • Effects of ecological succession on surface mineral horizons in Japanese volcanic ash soil. Reviewed

    Iimura Y, Fujimoto M, Hirota M, Tamura K, Higashi T, Yonebayashi K, Fujitake N

    Geoderma   2010

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

▼display all

Books etc

  • Ecological significance of throughfall and stemflow to he carbon cycle in forest ecosystems

    Chen S, Cao R, Yoshitake S, Iimura Y, Ohtsuka T( Role: Joint author)

    Springer  2022 

     More details

    Language:English   Book type:Scholarly book

  • Biometric-Based Estimations of Net Primary Production (NPP) in Forest Ecosystems.

    Ohtsuka T, Muraoka H, Saigusa N, Iimura Y, Koizumi H( Role: Joint author)

    Springer, UK.  2015 

     More details

    Language:English   Book type:Scholarly book

MISC

  • 伊吹山のヨモギと黒色火薬の生産・琵琶湖集 水域の環境メタロミクス連載第 12 回

    飯村康夫・水野隆文・原田英美子

    金属   92   1092 - 1099   2022

  • 水稲インディカ品種 Kasakath に由来する 2 種類の低リン応答性 QTL のコシヒカリへの集積

    山本竜也・小梶裕之・田端友樹・飯村康夫・清水顕史

    作物研究   60   2015

  • 日本の土壌炭素賦存量を量・質の両面から考える

    川東正幸・高橋正・藤井一至・高橋正通・三浦覚・石塚成宏・金子進司・白戸康人・矢 ケ崎秦海・高田祐介・和穎郎太・岸本文紅・米村正一郎・平館俊太郎・渡邊眞紀子・泉 岳樹・藤嶽暢英・飯村康夫

    日 本土壌肥料学会誌   84   145 - 150   2013

  • 野外研究サイトから(23) 高山(たかやま) サイト

    飯村康夫・大塚俊之・村岡裕由

    日本生態学会誌   2013

  • 志賀高原カヤノ平ブナ成熟林における 土壌有機物の特徴

    飯村康夫・廣田充・井田秀行・大塚俊之

    信州大学教育学部付属志賀自然教育研究施設研究業績   49   1 - 5   2012

  • 志賀高原カヤノ平ブナ成熟林における 土壌有機物の特徴

    飯村康夫・廣田充・井田秀行・大塚俊之

    信州大学教育学部付属志賀自然教育研究施設研究業績   49   1 - 5   2012

     More details

    Language:Japanese  

  • Potential of soil carbon sequestration at Takayama flux site

    Iimura Y, Ohtsuka T

    Proceedings of the 3th ASIA HORCs joint symposium   2011

  • 志賀高原カヤ の平ブナ林における炭素循環モニタリング I. 時空間的に不均一な土壌呼吸量の測定法 の検討

    廣田充・八代裕一郎・飯村康夫・志津庸子・大塚俊之・井田秀行

    信州大学教育学部付属志賀自然教育研究施設研究業績   48   9 - 14   2011

  • Effects of ecological succession on chemical characteristics of humic and fulvic acids in a Japanese volcanic ash soil

    Iimura Y, Hirota M, Tamura K, Higashi T, Fujitake N

    Proceedings of the 19th World Congress of Soil Science, Soil Solutions for a changing   2010

  • Effects of ecological succession on the characteristics of soil humic substances in a Japanese volcanic ash soil II. Chemical properties and stabilities of different size fractions of humic acids

    Iimura Y, Hirota M, Tamura K, Higashi T, Fujitake N

    Proceedings of the International Symposium on Soil Organic Matter Dynamics: Land use, Management and Global Change, p196 in Abstract book   2009

  • Effects of ecological succession on the characteristics of soil humic substances in a Japanese volcanic ash soil I. Concentration and chemical properties of humic substances

    Fujitake N, Iimura Y, Hirota M, Tamura K, Higashi T

    Proceedings of the International Symposium on Soil Organic Matter Dynamics: Land use, Management and Global Change   2009

▼display all

Research Projects

  • 降水レジーム変動を考慮した複合影響因子による土壌炭素の温暖化ダイナミクス

    2024.4 - 2027.3

    科研費 

      More details

    Authorship:Principal investigator 

  • 重炭酸化に着目したマングローブ林における新たな二酸化炭素吸収経路の探究

    2024.4 - 2025.3

    アサヒグループ財団学術研究助成 

      More details

    Authorship:Principal investigator 

  • How much can biochar application in paddy fields improve net CO2 absorption?

    2023.4 - 2024.3

      More details

    Authorship:Principal investigator 

  • 森林へのバイオ炭施用によるCO2放出の削減と生態系サービスの強化に関する関する研究

    2022.4 - 2025.3

    環境研究総合推進費 

      More details

    Authorship:Coinvestigator(s) 

  • Hou much mangrove plantations in abandoned shrimp ponds increase ecosystem carbon storage

    2021.4 - 2026.3

      More details

    Authorship:Coinvestigator(s) 

  • Next-generation rice farming with biochar: improving ecosystem services.

    2020.4 - 2023.3

      More details

    Authorship:Principal investigator 

  • Effects of comprehensive environmental impacts on soil carbon dynamics: focusing on priming effects

    2020.4 - 2023.3

      More details

    Authorship:Principal investigator 

  • Soil carbon mineralization by priming effect: Temperature sensitivity mechanism of soil carbon mineralization

    2017.4 - 2020.3

      More details

    Authorship:Principal investigator 

  • The effects of vegetation history on the biosphere in grasslands: the historical value of old grasslands

    2017.4 - 2020.3

      More details

    Authorship:Coinvestigator(s) 

  • Creating next-generation paddy soils using biochar.

    2017.4 - 2018.3

      More details

    Authorship:Principal investigator 

  • Effect of biochar on carbon sequestration and ecosystem responses in a broad-leaved deciduous forest

    2015.4 - 2019.3

      More details

    Authorship:Coinvestigator(s) 

  • Dynamics of soil organic carbon in a mangrove forest on an estuary of Trat River, eastern Thailand

    2015.4 - 2018.3

      More details

    Authorship:Collaborating Investigator(s) (not designated on Grant-in-Aid) 

  • Missing carbon from mangrove forests through tidal exchange

    2015.4 - 2017.3

      More details

    Authorship:Coinvestigator(s) 

  • Relationship between temperature sensitivity and priming effect in soil

    2015.4 - 2017.3

      More details

    Authorship:Principal investigator 

  • Scientific verification of paddy rice farming with biochar: is it possible to achieve both high productivity and reduced environmental impact?

    2014.4 - 2015.3

      More details

    Authorship:Principal investigator 

  • Responses of organic carbon in a variety of soils controlled by cellulose supply

    2013.4 - 2015.3

      More details

    Authorship:Principal investigator 

  • Evaluation of carbon dynamics in the old-growth forest in relation to stand structure

    2012.4 - 2016.3

    科研費 

      More details

    Authorship:Coinvestigator(s) 

  • Quantitative assessment of the effect of forest nitrogen uptake rates on persistent soil organic matter decomposition processes.

    2012.4 - 2013.3

      More details

    Authorship:Principal investigator 

  • Quantitative assessment of the effect of plant-soil nitrogen cycling on changes in humus characteristics.

    2011.4 - 2012.3

      More details

    Authorship:Principal investigator 

▼display all

Presentations

  • タイ王国トラート川河口マングローブ林における植生・深度別土壌有機物の分光学的特徴

    渡邉育弥, 木田森丸, SUCHEWABORIPONT Vilanee, POUNGPARN Sasitorn, 友常満利, 友常満利, 近藤美由紀, 吉竹晋平, 飯村康夫, 金城和俊, MAKNUAL Chatree, 大塚俊之, 藤嶽暢英

    日本土壌肥料学会講演要旨集(Web)  2019 

     More details

    Event date: 2019

  • マングローブの生態系純生産量(NEP)は本当に大きいのか?

    大塚俊之, 荒井秀, 友常満利, 吉竹晋平, 大西健夫, 藤嶽暢英, 木田森丸, 近藤美由紀, 飯村康夫, 金城和俊

    日本生態学会大会講演要旨(Web)  2018 

     More details

    Event date: 2018

    Language:Japanese  

  • 石垣島吹通川マングローブ林における炭素循環と生態系純生産量

    大塚俊之, 大西健夫, 吉竹晋平, 荒井秀, 友常満利, 藤嶽暢英, 木田森丸, 近藤美由紀, 飯村康夫, 金城和俊

    日本地球惑星科学連合大会予稿集(Web)  2018 

     More details

    Event date: 2018

    Language:Japanese  

  • 異なる植生,地形および地質特徴のマングローブ林内の堆積炭素

    金城和俊, 木田森丸, 飯村康夫, 藤嶽暢英, SASITORN Poungparn, 大塚俊之

    日本土壌肥料学会講演要旨集  2018 

     More details

    Event date: 2018

  • マングローブ林内土壌への海水塩によるフミン酸の選択的蓄積

    木田森丸, 田邉舞, 友常満利, 飯村康夫, 金城和俊, 近藤美由紀, POUNGPARN Sasitorn, 大塚俊之, 藤嶽暢英

    日本土壌肥料学会講演要旨集  2016 

     More details

    Event date: 2016

  • 高緯度北極湿原におけるCH4,N2Oフラックスの空間および季節変動

    大浦典子, 岸本(莫)文紅, 米村正一郎, 廣田充, 飯村康夫, 内田雅己, 内田雅己, 増本翔太, 中坪孝之

    日本生態学会大会講演要旨(Web)  2016 

     More details

    Event date: 2016

    Language:Japanese  

  • 北極ツンドラ湿地生態系における生態系純生産量の推定

    内田雅己, 廣田充, 岸本(莫)文紅, 神田啓史, 大浦典子, 飯村康夫, 中坪孝之

    日本生態学会大会講演要旨(Web)  2016 

     More details

    Event date: 2016

    Language:Japanese  

  • Tea Bagを用いた分解活性指標:標高・土壌温暖化・リター量処理の影響

    鈴木智之, 井田秀行, 小林元, 高橋耕一, NOH Nam‐Jin, 村岡裕由, 廣田充, 清野達之, 鈴木亮, 田中健太, 飯村康夫, 角田智詞, 丹羽慈, 日浦勉

    日本生態学会大会講演要旨(Web)  2015 

     More details

    Event date: 2015

    Language:Japanese  

  • 高緯度北極のコケツンドラにおけるCO<sub>2</sub>フラックスの推定

    内田雅己, 内田雅己, 廣田充, 岸本(莫)文紅, 神田啓史, 大浦典子, 飯村康夫, 増本翔太, 中坪孝之

    極域科学シンポジウム講演予稿集(CD-ROM)  2015 

     More details

    Event date: 2015

    Language:Japanese  

  • 成熟林では林冠構造によって土壌呼吸の日変化の制御要因が異なる―カヤノ平ブナ林における研究―

    西村貴皓, 飯村康夫, 井田秀行, 廣田充

    日本生態学会大会講演要旨(Web)  2015 

     More details

    Event date: 2015

    Language:Japanese  

  • マングローブ林内土壌における脱塩洗浄が溶存有機物の溶出に及ぼす影響

    木田森丸, 田邉舞, 加藤拓, 飯村康夫, 金城和俊, 大塚俊之, 友常満利, 藤嶽暢英

    日本土壌肥料学会講演要旨集  2015 

     More details

    Event date: 2015

  • 植生構造に着目した冷温帯ブナ成熟林における土壌呼吸とその空間変動

    西村貴皓, 飯村康夫, 井田秀行, 廣田充

    日本生態学会大会講演要旨(Web)  2014 

     More details

    Event date: 2014

    Language:Japanese  

  • 高緯度北極湿原における群集レベルのCO<sub>2</sub>フラックス特性と炭素吸収量の推定

    廣田充, 飯村康夫, 岸本(莫)文紅, 大浦典子, 内田雅己, 中坪孝之

    極域科学シンポジウム講演予稿集(CD-ROM)  2014 

     More details

    Event date: 2014

    Language:Japanese  

  • 高緯度北極湿原における大気‐湿原間CO<sub>2</sub>フラックスの空間変動

    廣田充, 飯村康夫, 岸本文紅, 大浦典子, 内田雅己, 中坪孝之

    日本生態学会大会講演要旨(Web)  2014 

     More details

    Event date: 2014

    Language:Japanese  

  • 山岳森林河川水中の粒径別有機物濃度とその季節変化

    加藤慎紹, 山田俊郎, 中鋪美香, 李富生, 大塚俊之, 飯村康夫

    全国会議(水道研究発表会)講演集  2013.9 

     More details

    Event date: 2013.9

    Language:Japanese  

  • チベット高山草原における標高差に沿った土壌有機物の諸特性

    飯村康夫, 大塚俊之, 曹广民, 賀金生, 廣田充, 下野綾子, 唐艶鴻

    日本生態学会大会講演要旨集  2013.3 

     More details

    Event date: 2013.3

    Language:Japanese  

  • 冷温帯ブナ成熟林における土壌呼吸の季節変化

    西村貴皓, 飯村康夫, 井田秀行, 廣田充

    日本生態学会大会講演要旨集  2013.3 

     More details

    Event date: 2013.3

    Language:Japanese  

  • P1-11 極相ブナ林のギャップ構造が土壌圏有機物分解に及ぼす影響(S1.土壌-植物系の窒素動態研究における安定同位体比の利用,1.物質循環・動態,2012年度鳥取大会)

    飯村 康夫, 廣田 充, 井田 秀行, 大塚 俊之

    日本土壌肥料学会講演要旨集  2012  一般社団法人 日本土壌肥料学会

     More details

    Event date: 2012

    Language:Japanese  

  • 二次遷移の進行が黒ボク土腐植物質の諸特性に及ぼす影響

    飯村康夫, 廣田充, 田村憲司, 東照雄, 米林甲陽, 藤嶽暢英

    日本生態学会大会講演要旨集  2010.3 

     More details

    Event date: 2010.3

    Language:Japanese  

  • P1-13 生態遷移の進行が黒ボク土の炭素集積機能に及ぼす影響 : 炭素・窒素安定同位体比から見た植生変化パターンと土壌炭素集積機能の関係(ポスター紹介,S1.安定・放射性同位体を用いた土壌炭素動態研究 -何がどこまで分かるのか?-,2010年度北海道大会)

    飯村 康夫, 廣田 充, 大塚 俊之

    日本土壌肥料学会講演要旨集  2010  一般社団法人 日本土壌肥料学会

     More details

    Event date: 2010

    Language:Japanese  

  • 2-3 二次遷移の進行に伴い黒ボク土腐植物質の諸特性はどうなるのか? : 腐植酸の炭素および窒素安定同位体比(2.土壌有機・無機化学,2009年度京都大会)

    飯村, 康夫, 米林, 甲陽, 田村, 憲司, 東, 照雄, 藤嶽, 暢英

    Abstracts of the meeting, the Society of the Science of Soil and Manure  2009.9  Japanese Society of Soil Science and Plant Nutrition

     More details

    Event date: 2009.9

    Language:Japanese  

  • 2-4 各種土壌フルボ酸の相違性に関する研究(2.土壌有機・無機化学,2008年度愛知大会)

    飯村 康夫, 大谷 知也, 谷 昌幸, 藤嶽 暢英

    日本土壌肥料学会講演要旨集  2008.9  一般社団法人日本土壌肥料学会

     More details

    Event date: 2008.9

    Language:Japanese  

  • 2-3 HPSECで細分画した黒ボク土腐植酸の^<13>C NMR特性(2.土壌有機・無機化学,2007年度東京大会)

    飯村 康夫, 藤本 麻里, 藤嶽 暢英

    日本土壌肥料学会講演要旨集  2007.8  一般社団法人日本土壌肥料学会

     More details

    Event date: 2007.8

    Language:Japanese  

  • 関東地方の暖温帯コナラ林における溶存有機窒素と溶存無機窒素による窒素沈着

    近藤美由紀・久司雅登・篠原隆一郎・中島知里・飯村康夫・藤嶽愓英・吉竹晋平・大塚俊之

    第71回日本生態学会  2024.3 

  • 森林へのバイオ炭施用が土壌微生物群集に及ぼす短期的影響

    吉竹晋平。佐宗若奈・安木奈津美・飯村康夫・大塚俊之・近藤美由紀・友常満利・藤嶽愓英・橋本麗優・小泉博

    日本土壌肥料学会  2023.9 

  • 水田へのバイオチャー施用が玄米の収量及び品質に及ぼす影響

    高野光・桒原裕也・尾坂兼一・飯村康夫

    日本土壌肥料学会  2023.9 

  • 森林でのバイオ炭散布が表層土壌の栄養塩動態に及ぼす中長期的影響

    飯村康夫・前田大和・大塚俊之・近藤美由紀・藤嶽愓英・吉竹晋平

    日本土壌肥料学会  2023.9 

  • 森林土壌におけるバイオ炭の添加がpH緩衝能に及ぼす影響

    仙波成都・飯村康夫・吉竹晋平・藤嶽愓英

    日本土壌肥料学会  2023.9 

  • 縄文期黒色土壌層が有する溶存有機物(DOM)収着機能の解明

    久司雅登・眞家永光・飯村康夫

    日本土壌肥料学会  2023.9 

  • バイオ炭施用した暖温帯コナラ林における林内雨による窒素沈着と土壌への浸透

    近藤美由紀・久司雅登・篠原隆一郎・中島知里・飯村康夫・藤嶽愓英・吉竹晋平・大塚俊之

    日本土壌肥料学会  2023.9 

  • 森林へのバイオ炭施用が7年間の従属栄養生物呼吸に及ぼす影響

    岡田駿・月森勇気・恵日格也・友常満利・小泉博・飯村康夫・大塚俊之・近藤美由紀・藤嶽愓英・吉竹晋平

    日本土壌肥料学会  2023.9 

  • 森林へのバイオ炭施用にともなう土壌水分の中長期的な応答性

    藤崎綾音・飯村康夫・大塚俊之・近藤美由紀・吉竹晋平・藤嶽愓英

    日本土壌肥料学会  2023.9 

▼display all