江西兴国土壤侵蚀动态的研究

利用遥感、GIS和灰色预测模型研究了中国南方典型区土壤侵蚀的状况 .结果表明 ,从 1958— 1988年 ,兴国县的水土流失面积和侵蚀量分别下降了 19 0 9%和 43 0 5% ;灰色预测显示无明显侵蚀区水土流失面积由 1988年的818 0 4km达到 1995年的 12 76 69km2 ;总侵蚀量由 60 7 2 1× 10 4 t a下降到 472 12× 10 4 t a .比较不同土地利用类型的产沙模数显示 ,林地的产沙模数最小 ,为 177 16～ 187 75t (km2 ·a) ,裸地最大 ,为 10 62 6 76～ 112 65 48t (km2 ·a) .由此证明 ,高覆盖植被可以减低水土流失 ,生物措施是治理土壤侵蚀的有效手段

Soil erosion in Xingguo County of Jiangxi Province

The soil erosion in typical areas of south China was studied based on remote sensing, GIS and gray forecasting model. The results of survey on Xingguo Count y showed that the soil erosion area and annual soil erosion amount decreased by 19 09% and 43 05% respectively from 1958 to 1988. The results of gray forecastin g model revealed that the soil and water loss area increased from 818 04 km 2 in 1988 to 1 276 69 km 2 in 1995 in non-erosion areas, in the meantime, total soil erosion amount decre ased from 607 21×10 4 t/a in 1988 to 472 12×10 4 t/a in 1995. Compared wit h the different landuse types, the soil loss modulus of forest was the lowest ( 1 77 16～187 75 t/(km 2·a)); on the contrary,that of the bare land was the hig hest ( 10 626 76 ～ 11 265 48 t/(km 2·a)). Thus it indicated that high vegetation coverage can decrease the soil and water loss,and the biological mea sure is the ef fective method to control soil erosion.