华东地区农田土壤有机碳时空格局动态模拟研究

基于已建成的农田土壤有机碳模型与GIS空间数据库的耦合,对华东6省(市)1980—2000年农田土壤有机碳时空变化进行模拟。结果表明:20年来该区土壤有机碳总体呈增加趋势,其中增加、持平和减少的面积分别占89.3%9、.5%和1.2%。1980—1985年土壤有机碳增加迅速,1985—1991年增加速率最快,其后趋缓。20年来农田土壤有机碳储量累计增加166 Tg,范围为140~193 Tg。其中安徽和江苏SOC储量增加量约占总增量的59.3%,上海、福建、江西和浙江占40.7%。

Modeling Farmland Soil Organic Carbon Dynamics in Eastern China:Spatio-Temporal Pattern

Eastern China is the most developed region and main area of food production.An evaluation on the changes of soil organic carbon(SOC) in this region is of great importance to insure national food security and to make regional sustainable development.By linking a soil organic carbon model developed by the authors to GIS database,the changes of SOC in eastern China was simulated from 1980 to 2000.Model estimates indicated that SOC increased in general over the 20 years.The acreage of SOC increase,balance and decrease accounts for 89.3%,9.5% and 1.2% of the total arable area,respectively.Rapid increase occurred from 1980 to 1985 and higher increase rates appeared during 1985 and 1991.The annual increase rate decreased after 1991.An overall increase was estimated to be 166 Tg,ranging from 140 Tg to 193 Tg over the 20 years.The quantity of SOC increased in the provinces of Anhui and Jiangsu accounts for 59.3% of the total,and that in the provinces of Fujian,Jiangxi and Zhejiang and Shanghai City accounts for 40.7%.