Research on the spatiotemporal distribution and control degree of soil erosion in Dali River Basin.

(3) As the slope increases, the area proportion of SECD within the 0.2-0.3 range in each slope zone shows an increasing trend, while that of SECD within the 0.5-1 range gradually decreases; (4) In the case of vegetation coverage greater than 80%, SECD is still concentrated between 0.3-0.5, which indicates that vegetation coverage is not the only factor affecting soil erosion control.

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The sand transport at Baijiachuan out showed an increasing and then decreasing trend from 2008 to 2010; an increasing trend from 2011 to 2013; a decreasing trend from 2013 to 2015; and an increasing and then decreasing trend from 2015 to 2020, which is consistent with the trend of the annual average soil erosion modulus of the Dali River Basin from 2008 to 2020.

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