Faculty Profiles - IIMURA Yasuo

Papers - IIMURA Yasuo

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Root exudates in mangrove forests accelerate bicarbonate production in the soil environment Reviewed

Norihiro Kato, Ken’ichi Osaka, Toshiyuki Ohtsuka, Yasuo Iimura

Scientific Reports 14 ( 1 ) 2024.12

Effects of the co-application of glucose, nitrogen, and elevated temperature on buried black soil carbon in a cool temperate deciduous broad-leaved forest Reviewed

Iimura Y, Tanaka D

Forests 2024.6

Biomass recovery of coastal young mangrove plantations in Central Thailand Reviewed

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

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 CO2 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-1 to 111.7 ± 12.3 Mg C ha−1. Fine root biomass up to a depth of 100 cm was 4.47 ± 0.33 Mg C ha−1, 4.24 ± 0.63 Mg C ha−1, and 6.92 ± 0.32 Mg C ha−1 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

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

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

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

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

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

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

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

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

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

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

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

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

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

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Papers - IIMURA Yasuo