The paper introduces the process of soil erosion evolution of the region after founding of new China.
介绍了新中国建立后区内土壤侵蚀演变的过程。
Thus, influences of vegetation on soil erosion and geomorphic evolution can be positive or negative.
因此，植被对土壤侵蚀和地貌演变，既有正的作用，也有负的作用。
Ravine density, which is an important factor indicating the extent of the fragmentation of the Earth surface, plays a significant role in the research of soil erosion and landform evolution, etc.
沟壑密度是反映地表破碎程度的重要因子，在土壤侵蚀、地貌演变等研究中有重要作用。
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