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《Resources and Enuironment In The Yangtza Basin》 2002-03
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SIMULATING OF ORGANIC CARBON CHANGES IN PADDY SOILS IN THE MIDDLE BASIN OF YANGTZE RIVER

TONG Cheng li\+1,WU Jin shui\+1,XIANG Wan sheng\+1,LIU Zi yong\+2,JIANG Ping\+2,LIU Shou long\+1 (1.Changsha Institute of Agricultural Modernization,The Chinese Academy of Sciences, Changsha 410125,China;2.Station of Soil and Fertilizer, Department  
SCNC model,a soil organic carbon simulation model developed in Changsha, was being compared with the model developed at Rothamsted (ROTHC 26.3) in this study. Both models were used to simulate the dynamic changes of organic carbon in paddy soils in the Middle Basin of the Yangtze River. It was showed that SCNC model was suitable for simulating the changes of organic carbon in paddy soils and ROTHC 26.3 model was not fit in the Middle Basin of the Yangtze River. The error of equilibrium simulating and measured values is separately 0.1 t/hm\+2 and 0.45 t/hm\+2, the relative error is separately 0.24% and 0.98%, and the total relative error of dynamics change is less than 10% using SCNC model in two experimental sites. However, the error of equilibrium simulating and measured values is separately 11.41 t/hm\+2 and 13.32 t/hm\+2, the relative error is separately 27.12% and 29.01% by using ROTHC 26.3 model in two experimental sites. It was also suggested that relative standard error method could be used for evaluating the effect of simulation.
【Fund】: 国家杰出青年基金 (4 992 5 10 2 );; 中国科学院知识创新工程重大项目(KZCX1 SW 0 1 14 );; 国家自然科学基金(4 98710 47);; 国家重点基础研究发展规划(G19990 1180 2 )项目资助
【CateGory Index】: S158
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