长江中游稻田土壤有机碳计算机模拟

分别用作者建立的土壤有机碳计算机模拟模型 (简称SCNC模型 )和英国洛桑模型 (ROTHC 2 6 .3)对长江中游 (湖南桃江和南县 )稻田土壤有机碳变化进行了模拟比较研究。结果表明 ,用SCNC模型模拟平衡时土壤有机碳含量与实际监测值较接近 ,相差分别为 0 .1和 0 .4 5t/hm2 ,误差分别为 0 .2 4 %和 0 .98% ;对稻田土壤有机碳变化的模拟 ,SCNC模型的拟合结果较好 ,利用相对标准误差法计算的误差为 4 .84 %～ 11.0 9% ,其中 6个处理有 5个处理的误差小于 10 %。对模拟结果进行误差概率统计 ,<± 5的占 5 2 .8% ,<± 10的占 81.9%。而洛桑模型不适合长江中游稻田土壤有机碳的模拟 ,按实际投入有机碳模拟平衡时土壤有机碳含量与实际监测值相比 ,分别低 11.4 1和13.32t/hm2 ,误差分别为 2 7.12 %和 2 9.0 1%。同时 ,对模型模拟结果的评价方法也进行了比较研究

SIMULATING OF ORGANIC CARBON CHANGES IN PADDY SOILS IN THE MIDDLE BASIN OF YANGTZE RIVER

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.