渭河流域土壤侵蚀时空特征及其地理探测

doi:10.19741/j.issn.1673-4831.2020.0266

Abstract

Abstract: Based on GIS and RS technology, the spatial and temporal differentiation characteristics of soil erosion risk in the Weihe River basin from 2000 to 2015 were examined by using the RUSLE model. Influencing factors of soil erosion in the river basin were investigated by using the geographical detector. Results from this study indicate that: (1) the soil erosion modulus of the Weihe River basin shown a decreased trend from 2000 to 2015; average soil erosion moduli for the four periods were 50.724, 42.270, 39.716 and 35.944 t·hm^-2·a^-1 in 2000, 2005, 2010 and 2015, respectively, and with the total erosion declined by 1.959×10⁸ t. The soil erosion intensity in the majority of areas was transformed to a low level; (2) areas with a large soil erosion intensity were mainly distributed in the Loess Plateau of Longdong and the Loess Hilly area of Longzhong; areas with smaller erosion intensity were mainly distributed in the Guanzhong Plain and the Valley Plain; (3) vegetation cover, afforestation area and rainfall were the main factors affecting the spatial distribution of soil erosion risk in the basin, and the interaction of different factors enhanced the explanatory power of soil erosion risk; and (4) areas with a vegetation cover less than 0.3, rainfall between 481.27-547.75 mm, elevation between 3 282-3 874 m and slope between 20° and 25° are high-risk areas of soil erosion in the basin.

Key words: Weihe River basin, soil erosion, RUSLE model, GeoDetector

CLC Number:

S157.1

JIA Lei, YAO Shun-bo, DENG Yuan-jie, LI Yuan-yuan, HOU Meng-yang, GONG Zhi-wen. Temporal and Spatial Characteristics of Soil Erosion Risk in Weihe River Basin and Its Geographical Exploration[J]. Journal of Ecology and Rural Environment, 2021, 37(3): 305-314.

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Temporal and Spatial Characteristics of Soil Erosion Risk in Weihe River Basin and Its Geographical Exploration

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