The landform evolution of Xianyang since the end of Qin Dynasty contains two aspects, the northward moving of the Weihe River bed and the changing of the edge slope of Xianyang tableland.
秦末以来，秦都咸阳地貌演变包括渭河河道北移和咸阳原边坡地貌变化两个方面。
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。
Organisms control landform evolution at different scales, but effects of organisms on geomorphology are different in scales.
生物在不同的空间尺度上控制着地貌的发育，但空间尺度不同，生物影响地貌的作用是不相同的。
Organisms control landform evolution at different scales, but effects of organisms on geomorphology are different in scales.
生物在不同的空间尺度上控制着地貌的发育，但空间尺度不同，生物影响地貌的作用是不相同的。
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