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《Chinese Journal of Soil Science》 2007-05
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Effects of Water Content on Decomposition of Soil Organic Carbon

LI Hai-ying1,PAN Jian-jun1,SUN Bo2 (1.College of Resource and Environmental Sciences,Nanjing Agricultural University,Nanjing 210095,China; 2.Institute of Soil Science,Chinese Academy of Sciences,Nanjing 210008,China)  
The paddy soil and vegetable garden soil were adjusted into 5 gradients of water contents:20%~100% and incubated at 25℃ for 100d. Results showed that the decomposition rates of soil organic carbon in cropland at the 5 gradients of water contents increased significantly in the beginning,then kept at steady and lower levels throughout the 100d incubation period. Low-water content was not beneficial to soil organic carbon decomposition of paddy soil and vegetable garden soil,medium-water content was good for decomposing soil organic carbon of vegetable garden soil,high-water content benefited the one of paddy soil. The power function was fit for the curve of soil organic carbon cumulative amount,and there was a better correlation between b0,b1 and water content,respectively.
【Fund】: 国家重点基础研究发展计划(973计划)资助(2005CB121108)
【CateGory Index】: S152.7
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