WEPP模型在砒砂岩地区土壤侵蚀模拟的适用性研究

The applicability of WEPP in simulating the soil erosion in soft rock region

以内蒙古自治区准格尔旗西黑岱沟小流域为研究区,基于研究区2004～2009年的气象和土壤侵蚀资料,选取林地、草地和休闲地三种不同土地利用方式的坡面,研究了WEPP模型在三种坡面土壤侵蚀过程模拟中的适用性。结果表明:WEPP模型对研究区三种管理方式下的土壤侵蚀模拟中总体结果较好,模拟值与实测值的相关系数均较高,分别为0.915、0.889和0.899;WEPP模型模拟林地和草地土壤侵蚀的纳什模型效率分别为0.661和0.775,说明WEPP模型适用性较强,而模拟休闲地侵蚀量时效率为负值,可能与休闲地受人为活动影响较大,导致模型不能很好地模拟实际情况有关。

Taking small watershed of Xiheidai gully,Zhungeer Banner in Inner Mongolian Autonomous Region as the study area,on the base of the weather and soil erosion data of the study area from 2004 to 2009,we selected three kinds of slopes of different land use types： forestland,grassland and fallow to study the suitability of WEPP in the simulating of the soil erosion amounts of the three kinds of slopes.The results showed that the general result of WEPP in the simulating of the soil erosion amounts of the three kinds of slopes was sastisfactory,the correlation coefficients between the simulation values and measured values of the three kinds of slopes were 0.915,0.889 and 0.899,respectively;The nash bargaining model efficiencies of WEPP for forestland and grassland reached 0.661 and 0.775,and showed a strong applicability,but for the fallow,the nash bargaining model efficiencies of WEPP was negative value,it may be affected by human activities greatly,which lead to WEPP could not simulate the actual situation well.