摘要
以土壤基本性状、气候条件、作物产量和耕作措施等为基本输入数据 ,将土壤有机碳分解模型与GIS技术耦合 ,模拟江苏省农田土壤有机碳含量分布的现状及未来变化趋势。对典型农区土壤有机碳测定数据的验证表明 ,所采用的模型能较好地描述土壤有机碳的动态变化。模拟结果指出 ,自第二次土壤普查以来 ,全省 77%的农田土壤有机碳含量有所增加。至 2 0 0 0年 ,苏北和沿海地区土壤有机碳含量增加量为 1.0～ 3.0g·kg-1,苏南太湖地区增加量为 3.5～ 5 .0g·kg-1。但苏中的江淮平原和宁镇丘陵区略有下降 ,仅增加约 0 .5～ 1.5g·kg-1。预测 2 0 10年在不同秸秆还田量条件下 ,江苏省农田土壤有机碳含量将继续增加 。
Based on the databases of soil, climate, crop production and agricultural management, changes of soil organic carbon of agroecosystems in Jiangsu province were simulated, using a soil organic carbon model with a linkage of GIS. Four data sets of soil organic carbon measured from various field experiments in Jiangsu province were used to validate the model. It was demonstrated that the model simulation in general agreement with the field measurements. Model simulation indicated that the soil organic carbon content in approximately 77% of the agricultural soils in Jiangsu province has increased since the 2nd national soil survey completed in the early 1980s. Compared with the values in 1985, the soil organic carbon content in 2000 was estimated to increase by 1.0～3.0 g·kg -1 for the north and the coastal areas of the province, and by 3.5～5.0 g·kg -1 for the region of Taihu lake in the south. A slight decrease (about 0.5～1.5 g·kg -1) was estimated for the central region of Jiangsu and the Nanjing-Zhenjiang hilly area. Model prediction for the 2010, assuming under two scenarios, i.e., with 30% and 50% of the harvested crop straw incorporation, suggested that the soil organic carbon in Jiangsu province would increase, and thus that the agricultural soils would have potential as organic carbon storage. The incorporation of crop straw into soils is of great benefit to increase soil carbon storage, consequently to benefit the control of the rise of atmospheric CO 2 concentration and to maintain the sustainable development of agriculture.
出处
《中国农业科学》
CAS
CSCD
北大核心
2003年第11期1312-1317,共6页
Scientia Agricultura Sinica
基金
中国科学院知识创新工程重大资助项目 (KZCX1 SW 0 1 13 )
中国科学院"百人计划"资助项目
