中国农业科学（英文版）2002，Vol.1Issue(3)：307-312,6.
Model Establishment for Simulating Soil Organic Carbon Dynamics
Model Establishment for Simulating Soil Organic Carbon Dynamics
摘要
Abstract
Assuming that decomposition of organic matter in soils follows the first-order kinetics reaction,a computer model was developed to simulate soil organic matter dynamics. Organic matter in soils is divided up into two parts that include incorporated organic carbon from crop residues or other organic fertilizer and soil intrinsic carbon. The incorporated organic carbon was assumed to consist of two components, labile-C and resistant-C. The model was represented by a differential equation of dCi/dt = Ki× fT × fw × fs × Ci ( i = l,r, S ) and an integral equation of Cit = Cio × EXP ( Ki X fT X fw X fs X t ). Effect of soil parameters of temperature, moisture and texture on the decomposition was functioned by the fT, fw and fs, respectively.Data from laboratory incubation experiments were used to determine the first-order decay rate Ki and the fraction of labile-C of crop residues by employing a nonlinear method. The values of K for the components of labile-C and resistant-C and the soil intrinsic carbon were evaluated to be 0. 025,0. 080 × 10-2 and 0. 065 ×10-3d-1, respectively. The labile-C fraction of wheat straw, wheat roots, rice straw and rice roots were0.50, 0.25, 0.40 and 0.20, respectively. These values are related to the initial residue carbon-to-nitrogen ratio ( C/N) and lignin content.关键词
Agricultural soils/Organic carbon/Decomposition/Simulation modelKey words
Agricultural soils/Organic carbon/Decomposition/Simulation model引用本文复制引用
HUANG Yao,LIU Shi-liang,SHEN Qi-rong,ZONG Liang-gang..Model Establishment for Simulating Soil Organic Carbon Dynamics[J].中国农业科学（英文版）,2002,1(3):307-312,6.基金项目
This project was supported by the Hundred Talents Program, the Chinese Academy of Sciences and the Natural Science Foundation of China (No.30030090 （）
39830220) （）
