植被盖度在土壤侵蚀模数计算中的应用

中国东北黑土区是重要商品粮基地，长期的自然侵蚀和过度人为开垦，引起的黑土退化、水土流失日趋严重，限制了粮食产量的提高。植被具有截留降水，增强土壤抗蚀性，抗击减流等作用，能够有效控制水土流失。植被盖度也对水土流失的强度产生直接影响。采用遥感与GIS技术结合的方法，通过高分辨率影像WorldView提取植被盖度，用以计算中国土壤侵蚀方程(CSLE)中生物措施因子B值的范围，并将其应用于黑龙江省克山县古城小流域土壤侵蚀量的估算中，对该小流域的土壤侵蚀状况进行了定性和定量分析。结果显示，土壤侵蚀状况与植被盖度关系密切，说明植被在治理土壤侵蚀中有巨大作用，同时体现出该方法精度高，可信度大，在同类研究中具有适用性。

Application of Vegetation Cover in Soil Erosion Modulus Calculation

The phaeozem region of Northeast China is an important commodity grain base.The phaeozem degradation and soil erosion caused by long-term natural erosion and overexploitation limit the increasing of production.Vegetation not only plays an important role in controlling soil erosion,intercepting precipitation and improving soil erosion resistance,but also has a direct effect on erosion degree.The amount of soil erolion in Uucheng watershed of Keshan County,Heilongjiang Province is estimated using bilogical control fate for method by which vegetation coverage is extracted from high-resolution remote sensing images with RS and UIS technology and makes qualitative and quantitative analysis.Results show that soil erosion has a close relation with vegetation coverage,which means that vegetation plays an important role in controlling soil erolion and demonstrates that the method used in the study is applicable in similar studies,depending on its accuracy and credibility.