Effects of vegetation and cultivation on δ^<13>C values of soil organic carbon and estimation of its turnover in Asian tropics : A case study in Thailand(Environment)
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概要
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The carbon (C) content and natural ^<13>C abundance (δ^<13>C) of soil organic matter were analyzed in soils collected from forests and agricultural fields in Thailand to determine the origin and turnover of soil organic carbon in the Asian tropics. The δ^<13>C values of the soil horizons in two forests were in the range of C3 plant values. Soil δ^<13>C values in fields with continuous cultivation of lowland rice (C3 plant) and sugarcane (C4 plant) were less negative than those in the forests. The organic carbon contents and δ^<13>C values in 226 top-soils from agricultural fields varied in four regions of Thailand and were affected by the cultivation of preceding crops and weeds. The δ^<13>C values of two series of top-soils from forests and sugarcane fields were investigated in the Northeastern and Central Plain Regions. Conversion of forest land to fields for sugarcane cultivation led to a rapid decrease in the content of soil organic carbon and an increase in the soil δ^<13>C values. The calculated forest-derived carbon rapidly decreased with a half-life of 0.35 years (in the Northeastern Region) after conversion to fields for sugarcane cultivation, and sugarcane-derived carbon steadily accumulated. Rapid changes in the δ^<13>C values of soil organic carbon after land conversion to fields with vegetation with different photosynthetic types may result from low organic carbon content and rapid turnover in the tropics.
- 社団法人日本土壌肥料学会の論文
著者
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YONEYAMA Tadakatsu
Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The U
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OKADA Hideki
University of Tsukuba
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CHONGPRADITNUM Prapasri
Soil Science Division, Department of Agriculture
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ANDO Shotaro
National Institute of Livestock and Grassland Science
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PRASERTSAK Praphan
Suphan Buri Field Crops Research Centre
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HIRAI Keizo
Forest Products Research Institute
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Yoneyama Tadakatsu
Department Of Applied Biological Chemistry Graduate School Of Agricultural And Life Sciences The Uni
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Yoneyama Tadakatsu
Department Of Applied Biological Chemistry The University Of Tokyo
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Yoneyama Tadakatsu
Department Of Agricultural Chemistry University Of Tokyo:(present Address)division Of Environmental
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YAMAGUCHI Tomoya
Tohoku Natl. Agri. Exp. St.
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Chongpraditnum Prapasri
Soil Science Division Department Of Agriculture
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Yoneyama Tadakatsu
Department Of Agricultural Chemistry University Of Tokyo
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