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Journal Articles

Formation and mobility of soil organic carbon in a buried humic horizon of a volcanic ash soil

Wijesinghe, J. N.*; Koarashi, Jun; Atarashi-Andoh, Mariko; Kokubu, Yoko; Yamaguchi, Noriko*; Sase, Takashi*; Hosono, Mamoru*; Inoue, Yuzuru*; Mori, Yuki*; Hiradate, Shuntaro*

Geoderma, 374, p.114417_1 - 114417_10, 2020/09

 Times Cited Count:2 Percentile:44.21(Soil Science)

Oral presentation

Physicochemical and isotopic characteristics of charred plant fragments in Japanese soils

Nishimura, Shusaku; Hiradate, Shuntaro*; Atarashi-Andoh, Mariko; Koarashi, Jun

no journal, , 

no abstracts in English

Oral presentation

Quantitative understanding of the heterogeneity of soil organic carbon degradability for predicting long-term response of soil carbon to warming

Koarashi, Jun; Atarashi-Andoh, Mariko; Ishizuka, Shigehiro*; Hiradate, Shuntaro*; Kokubu, Yoko

no journal, , 

Microbial decomposition of soil organic carbon (SOC) is an important component of the global carbon (C) cycle, and even a small warming-driven change in the size and decomposition rate of SOC pools could significantly impact the atmospheric CO$$_{2}$$ concentration and thus the global C cycle. A quantitative understanding of heterogeneity of SOC degradability is essential for a reliable prediction of the response of soils to warming. While fast-cycling SOC pools dominate C fluxes from soils, the longer-term response of soils to warming will be largely determined by the sizes and turnover times of slow-cycling SOC pools in the soils, which can hardly be identified by conventional analytical and incubation methods. We attempted to characterize SOC pools with respect to their sizes and specific turnover times in Japanese forest soils, by a combinatorial use of SOC fractionation and $$^{14}$$C analysis. We represent the soils as a mixture of SOC pools with different turnover times ranging from years to more than a millennium, and on the basis of this representation and simple model calculations, we show the potential importance of slow-cycling SOC pools with turnover times of several decades to 200 years for the prediction of positive feedback to climate change over the next century.

Oral presentation

What kind of effect does warming have on soil organic carbon?

Koarashi, Jun; Atarashi-Andoh, Mariko; Takagi, Kentaro*; Kondo, Toshiaki*; Teramoto, Munemasa*; Nagano, Hirohiko; Kokubu, Yoko; Takagi, Masahiro*; Ishida, Sachinobu*; Hiradate, Shuntaro*; et al.

no journal, , 

no abstracts in English

Oral presentation

Transition of soil organic carbon in a volcanic ash soil derived from Towada volcano, Japan

Wijesinghe, J.*; Koarashi, Jun; Atarashi-Andoh, Mariko; Kokubu, Yoko; Yamaguchi, Noriko*; Sase, Takashi*; Hosono, Mamoru*; Inoue, Yuzuru*; Mori, Yuki*; Hiradate, Shuntaro*

no journal, , 

Oral presentation

Source of nitrogen acquired by plants grown on Nakoudojima Island, Ogasawara, Japan, estimated from $$delta$$$$^{15}$$N value

Hiradate, Shuntaro*; Miyakuni, Ryo*; Sato, Nozomu*; Atarashi-Andoh, Mariko; Koarashi, Jun; Kachi, Naoki*

no journal, , 

no abstracts in English

Oral presentation

Warming effects on the quantity and quality of organic carbon in Japanese forest surface soils

Koarashi, Jun; Atarashi-Andoh, Mariko; Takagi, Kentaro*; Kondo, Toshiaki*; Teramoto, Munemasa*; Nagano, Hirohiko; Kokubu, Yoko; Takagi, Masahiro*; Ishida, Sachinobu*; Hiradate, Shuntaro*; et al.

no journal, , 

It is possible that global warming will promote the decomposition of soil organic carbon (SOC) and cause further global warming. In this study, the quantity and quality of SOC (carbon and nitrogen content, stable and radioactive carbon isotope composition, etc.) were investigated in warming and control plots at five forest sites in Japan, where long-term soil warming experiments have been conducted. Results show no remarkable difference in the quantity and quality of SOC stored in surface (0-20 cm) soils between the warming and control plots, suggesting the warming-induced increase in the soil respiration will continue over the next decade, probably due to the abundant SOC storage in Japanese forest surface soils.

Oral presentation

The Rate of vertical translocation of soil organic carbon fractions stored in buried humic horizon from an Andosol

Wijesinghe, J.*; Koarashi, Jun; Atarashi-Andoh, Mariko; Kokubu, Yoko; Yamaguchi, Noriko*; Sase, Takashi*; Hosono, Mamoru*; Inoue, Yuzuru*; Mori, Yuki*; Hiradate, Shuntaro*

no journal, , 

Oral presentation

Stocks and dynamics of organic carbon in Japanese forest surface soils and their response to long-term experimental warming

Koarashi, Jun; Atarashi-Andoh, Mariko; Takagi, Kentaro*; Kondo, Toshiaki*; Teramoto, Munemasa*; Nagano, Hirohiko; Kokubu, Yoko; Takagi, Masahiro*; Ishida, Sachinobu*; Hiradate, Shuntaro*; et al.

no journal, , 

no abstracts in English

Oral presentation

Estimation of carbon accumulation rate in a volcanic ash soil in Aomori

Hiradate, Shuntaro*; Wijesinghe, J. N.*; Koarashi, Jun; Atarashi-Andoh, Mariko; Sase, Takashi*; Hosono, Mamoru*; Inoue, Yuzuru*; Mori, Yuki*

no journal, , 

no abstracts in English

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