漓江流域土地石漠化空间分布及驱动因子分析

doi:10.16088/j.issn.1001-6600.2020052702

Abstract

Abstract: Karst rocky desertification of land is the most serious ecological problem in Southwest China, which threatens and restricts the sustainable development of the region. Taking the typical karst landform-Lijiang River basin as the study area, combining 6 natural environmental factors with 3 social environmental factors, based on GIS method and geographical detector method, the spatial distribution and key driving factors of karst rocky desertification in Lijiang River basin were analyzed. The results show that the total area of karst rocky desertification in Lijiang River basin is 1 547.6 km², accounting for 8.9% of the total land area of the Lijiang River basin, and the proportion of light, medium and severe karst rocky desertification in the total area of karst rocky desertification is 50.0%, 34.2% and 15.8%, respectively. In terms of space, Yangshuo County and Qixing District have the most extensive karst rocky desertification distribution, accounting for more than 18% of the total land area of their respective administrative regions. The middle and lower reaches of the Lijiang River are significantly more karst rocky desertification than the upper reaches. The contribution of natural environmental factors to karst rocky desertification is greater than that of social environmental factors. The influences of environmental factors from large to small are lithology, geomorphology, NDVI, elevation, road distance, population density, average annual precipitation, slope, and GDP. Lithology (0.34) and geomorphology (0.28) are the key driving factors of karst rocky desertification, and their explanatory power for the interaction of karst rocky desertification reaches 0.45.

Key words: karst rocky desertification, spatial analysis, geographical detector, Lijiang River basin, driving factors

CLC Number:

X144

ZHU Bailu, YANG Qiyong, XIE Yunqiu, DENG Yan, TANG Meirong, LIU Dacun, ZENG Hongchun. Spatial Distribution and Driving Factors of Karst Rocky Desertification in Lijiang River Basin[J].Journal of Guangxi Normal University(Natural Science Edition), 2021, 39(3): 139-150.

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Spatial Distribution and Driving Factors of Karst Rocky Desertification in Lijiang River Basin

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