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《Journal of Agro-Environment Science》 2008-04
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Modeling the Effect of Marshland Conversion to Cropland on Soil Organic Carbon

SU Yan-hua1, 2, HUANG Yao1 (1.LAPC, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100083, China;2.Graduate University of Chinese Academy of Sciences, Beijing 100049, China)  
The conversion of wetland to cropland is believed to induce soil organic carbon(SOC)loss.To simulate the changes in SOC due to marshland conversion, an existing model(Soil-C)was modified in this paper.Soil-C was originally developed to simulate SOC dynamics in cropland, in which SOC was simply viewed as a mono-component.Modification to the original model was made by splitting SOC pool into two components of light fraction(LF)and heavy fraction(HF).Decomposition of LF and HF pool was simulated by a first-order kinetics equation, and the first-order decay rate was positively correlated to SOC density.The modified and the original model were validated against independent data sets with temporal and spatial difference.Model validation indicated that the modified model is capable of simulating the changes in LF and HF pool and can well capture the changes in SOC when the marshland was converted into cropland.A further simulation suggested that significant SOC loss occurred in the early several years after marshland conversion was greatly attributed to a rapid decomposition of LF pool with higher first-order decay rates, while the original model could not capture the signal due to a lower first-order decay rate.
【Fund】: 国家自然科学基金重点项目“三江平原沼泽湿地垦殖对地—气碳交换和土壤碳库影响的研究”(40431001)
【CateGory Index】: S153
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