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soil Organic Carbon Loss and Turnover Resulting from Forest Conversion to Maize Fields in Eastern Thailand

Pedosphere 2011年第5期21卷 581-590页

作者： s.jaiarree A.CHIDTHAIsONG N.TANGTHAM C.POLPRAsERT E.sAROBOL s.C.TYLER Joint Graduate school of Energy and Environment King Mongkut's University of Technology Thonburi Faculty of Forestry Kasetsart University sirindhorn International Institute of Technology Thammasat University Faculty of Agriculture Kasetsart University Department of Chemistry Norco College

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 *** 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 *** from forest to maize cultivation for the duration of 12 years reduced sOC stocks at the rate of 6.97 Mg C ha-1 *** was most pronounced in the top 10 cm soil layer,which was 47% after 12 years of *** carbon isotope data revealed that the main fraction lost was forest-derived *** low input rates of maize-derived C were not sufficient to maintain sOC at the level prior to forest *** 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).

关键词： C stocks forest-derived C land-use change maize-derived C stable carbon isotope

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