飯村 康夫 (イイムラ ヤスオ)

IIMURA Yasuo

写真a

職名

講師

メールアドレス

メールアドレス

出身大学院 【 表示 / 非表示

  • 神戸大学  自然科学研究科  修士課程  2007年03月

  • 神戸大学  農学研究科  博士課程  2010年03月

取得学位 【 表示 / 非表示

  • 博士(農学)  神戸大学  2011年03月

学内職務経歴 【 表示 / 非表示

  • 滋賀県立大学  環境科学部  生物資源管理学科  講師   2019年04月 ~ 現在

  • 滋賀県立大学  環境科学部  生物資源管理学科  助教   2013年11月 ~ 2019年03月

所属学会・委員会 【 表示 / 非表示

  • 日本土壌肥料学会  

  • 日本腐植物質学会  

  • 日本地球惑星科学連合  

  • International Humic Substances Society  

委員歴・役員歴 【 表示 / 非表示

  • 日本土壌肥料学会常任編集委員   2016年04月 ~ 2018年03月

  • 日本腐植物質学会常任評議員   2018年01月 ~ 現在

研究分野(科研費分類) 【 表示 / 非表示

  • 環境動態解析

  • 植物栄養学・土壌学

 

研究テーマ 【 表示 / 非表示

  • 土壌有機物の実態と機能に関する研究

    土壌 生態系 有機物 炭化物 資源

論文 【 表示 / 非表示

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

    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  Science of the Total Environment  801    2021年12月

    10.1016/j.scitotenv.2021.149682  共著  

    [概要]

    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.

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

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

    Forests  Forests  11 (10)   1 ~ 15  2020年10月

    10.3390/f11101041  共著  

    [概要]

    © 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.

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

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

    Polar Science  Polar Science    2020年01月

    10.1016/j.polar.2020.100562  共著  

    [概要]

    © 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.

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

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

    Soil Science and Plant Nutrition  Soil Science and Plant Nutrition    2020年01月

    10.1080/00380768.2020.1753481  共著  

    [概要]

    © 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.

  • 大白川ブナ・ミズナラ成熟林(old-growth forest)における土壌窒素無機化速度の空間変動解析

    飯村 康夫, Vilanee Suchewaboripont, 廣田 充, 吉竹 晋平, 大塚 俊之

     日本土壌肥料学雑誌    2019年08月

    共著  

  • 冷温帯落葉広葉樹林における林床ササ群落(Sasa senanensis)の有無が火山灰土壌の窒素無機化速度に及ぼす影響

    飯村 康夫, 森田 悠介, 大塚 俊之

     日本土壌肥料学雑誌    2019年07月

    単著  

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

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

    Regional Studies in Marine Science  Regional Studies in Marine Science  27    2019年03月

    10.1016/j.rsma.2019.100516  共著  

    [概要]

    © 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 Mg ha −1 y −1 , partitioned into 3.10 ± 0.51 Mg ha −1 y −1 as woody NPP (net increase in aboveground woody parts, SI), and 7.56 ± 0.99 Mg ha −1 y −1 as foliage NPP (litter production, including foliage and reproductive organs, L n ). The mature mangrove forest had a relatively low SI/L n ratio (0.41 ± 0.03), although litter fall production was within the range previously recorded for mangroves. The lower woody NPP in the mature mangroves was due to the exclusion of R. stylosa once the stand was in a late successional stage dominated by B. gymnorrhiza.

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

    Iimura Y., Tabara I., Izumitsu K., Fujitake N.

    Soil Science and Plant Nutrition  Soil Science and Plant Nutrition    2019年01月

    10.1080/00380768.2019.1665969  共著  

    [概要]

    © 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 temperature (Q10 = 1.0). This was caused by the suppression of CO2 emission from the soil with increasing temperature (Q10 = 0.9). On the other hand, soil-originated CO2 emission clearly increased with increasing temperature (Q10 = 3.4) when Q10 values were calculated on the assumption that the temperature and substrate supply increase at the same time (from 25°C). These results suggest that not only the temperature increase but also the labile carbon supply may be important for the temperature sensitivity of Japanese volcanic ash soil.

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

    Iimura Y., Kinjo K., Kondo M., Ohtsuka T.

    Soil Science and Plant Nutrition  Soil Science and Plant Nutrition    2019年01月

    10.1080/00380768.2019.1660589  共著  

    [概要]

    © 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-cm depth was 27.1 ± 11.3 Mg C ha−1. The soil C stock in the mangrove forest at a depth of 90 cm at the study site was 251.0 ± 34.8 Mg C ha−1, and it seems to be lower value in the tropical region but it to be higher in subtropical East Asian mangrove sites. Dead roots, especially dead fine roots, but not fallen litter, were significantly positively correlated with soil C stocks. The δ13C values obtained from soils ranged from −29.3‰ to −27.0‰; these values are consistent with those for below-ground fine roots. These results strongly suggest that dead fine roots could be a main factor controlling soil C stocks at this study site.

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

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

    Soil Science and Plant Nutrition  Soil Science and Plant Nutrition    2019年01月

    10.1080/00380768.2019.1672101  共著  

    [概要]

    © 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. SU had the lowest C content and C:N ratio of all the substrates. We found that biochar quality (volatile and nonvolatile matter content) was clearly related to the decomposition rate when mixed into the soil, but we could not find this relationship when biochar was sprinkled onto the soil. The addition of biochar to the soil induced a positive PE in the early stages (except for BC800 sprinkled) but suppressed CO2 emissions from native soil organic matter (negative PE) in the later stages, whereas the PE with SU application was always positive regardless of application method. Our results suggest that when biochar is sprinkled onto soil it is more likely to suppress soil-derived CO2 emission than when mixed in soil; however, the trend based on biochar quality was unclear.

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著書 【 表示 / 非表示

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

    Ohtsuka T, Muraoka H, Saigusa N, Iimura Y, Koizumi H

    Springer, UK.  2015年

    単行本(学術書)  共著

研究シーズ 【 表示 / 非表示

  • 土壌から地球温暖化問題を考える