| 泰国东部土地由森林转化为玉米地引起土壤有机碳流失及其储量的降低 |
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| 作者姓名： | S. JAIARREE A. CHIDTHAISONG N. TANGTHAM C. POLPRASERT E. SAROBOL S. C. TYLER |
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| 作者单位： | Joint Graduate School of Energy and Environment, King Mongkut’s University of Technology Thonburi, Bangkok 10140 (Thailand);Joint Graduate School of Energy and Environment, King Mongkut’s University of Technology Thonburi, Bangkok 10140 (Thailand);Faculty of Forestry, Kasetsart University, Bangkok 10900 (Thailand);Sirindhorn International Institute of Technology, Thammasat University, Pathum Thani 12121 (Thailand);Faculty of Agriculture, Kasetsart University, Bangkok 10900 (Thailand);Department of Chemistry, Norco College, Norco, CA 92860-2600 (USA) |
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| 基金项目： | Supported by the National Research University Project of Thailand's Office of the Higher Education Commission (HEC) |
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| 摘 要： | Soil organic carbon(SOC) content and its stable carbon isotopic composition(within the upper 1 m) were measured to determine the e?ect of land-use changes from dry evergreen forest to maize fields in eastern Thailand.Digital land cover maps,derived from aerial photography and satellite images for years 1989,1996,and 2002 were used in association with field surveys and farmer interviews to derive land-use history and to assist in study site selection.Conversion from forest to maize cultivation for the duration of 12 years reduced SOC stocks at the rate of 6.97 Mg C ha-1 year-1.Reduction was most pronounced in the top 10 cm soil layer,which was 47% after 12 years of cultivation.Stable carbon isotope data revealed that the main fraction lost was forest-derived C.Generally low input rates of maize-derived C were not sufficient to maintain SOC at the level prior to forest conversion.After 12 years of continuous maize cultivation,the maize-derived C fraction made up about 20% of total SOC(5 Mg ha-1 of the total 25.31 Mg ha-1).
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| 关 键 词： | C stocks forest-derived C land-use change maize-derived C stable carbon isotope |
| 收稿时间： | 21 December 2010 |
Soil organic carbon loss and turnover resulting from forest conversion to maize fields in eastern Thailand |
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| S. JAIARREE,A. CHIDTHAISONG,N. TANGTHAM,C. POLPRASERT,E. SAROBOL,S. C. TYLER.Soil organic carbon loss and turnover resulting from forest conversion to maize fields in eastern Thailand[J].Pedosphere,2011,21(5):581-590. |
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| Authors: | S JAIARREE A CHIDTHAISONG N TANGTHAM C POLPRASERT E SAROBOL and S C TYLER |
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| Institution: | aJoint Graduate School of Energy and Environment, King Mongkuts University of Technology Thonburi, Bangkok 10140 (Thailand);bFaculty of Forestry, Kasetsart University, Bangkok 10900 (Thailand);cSirindhorn International Institute of Technology, Thammasat University, Pathum Thani 12121 (Thailand);dFaculty of Agriculture, Kasetsart University, Bangkok 10900 (Thailand);eDepartment of Chemistry, Norco College, Norco, CA 92860-2600 (USA) |
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| Abstract: | Soil organic carbon (SOC) content and its stable carbon isotopic composition (within the upper 1 m) were measured to determine the effect of land-use changes from dry evergreen forest to maize fields in eastern Thailand. Digital land cover maps, derived from aerial photography and satellite images for years 1989, 1996, and 2002 were used in association with field surveys and farmer interviews to derive land-use history and to assist in study site selection. Conversion from forest to maize cultivation for the duration of 12 years reduced SOC stocks at the rate of 6.97 Mg C ha-1 year-1. Reduction was most pronounced in the top 10 cm soil layer, which was 47% after 12 years of cultivation. Stable carbon isotope data revealed that the main fraction lost was forest-derived C. Generally low input rates of maize-derived C were not sufficient to maintain SOC at the level prior to forest conversion. After 12 years of continuous maize cultivation, the maize-derived C fraction made up about 20% of total SOC (5 Mg ha-1 of the total 25.31 Mg ha-1). |
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| Keywords: | forest-derived C land-use change maize-derived C C stocks stable carbon isotope |
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