| Citation: |
HAN Nianlong, JI Jiahui. Study on the Temporal and Spatial Variation and Influencing Factors of Soil and Water Conservation Function Services Supply and Demand in the Dongjiang River Basin[J]. Journal of South China Normal University (Natural Science Edition), 2024, 56(5): 91-101. DOI: 10.6054/j.jscnun.2024067
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Accurately identifing the spatial and temporal relationship between the supply and demand of soil and water conservation function services and its influencing factors can provide an valuable basis for the prevention and management of regional soil erosion. Taking the Dongjiang River Basin as an example, the supply and demand of soil and water conservation services from 2000 to 2020 were quantified based on the RUSLE model, and the geographically weighted regression model was further used to explore the influence of the dominant factors on the relationship between the changes in the supply and demand of soil and water conservation services. The results show that: (1)The supply and demand of soil and water conservation services in most areas of the Dongjiang Basin (about 64.46%) show a surplus, with deficits mainly in the central and southern parts of the basin, with the supply-demand ratio showing a downward and then an upward trend from 2000 to 2020 (the supply-demand ratio for 2000, 2010 and 2020 are 0.042, 0.037 and 0.044, respectively). (2)The areas with the "L-H"(low supply-high demand) spatial match type of soil and water concervation services are mainly distributed in the southeastern of the Dongjiang Basin. which is a key area for improving the imbalance between the supply of and demand for soil and water conservation services. (3)NDVI had the greatest influence on the supply and demand of soil and water conservation ser- vices in the Dongjiang Basin and showed a global positive effect, while the effects of average annual rainfall, population density, DEM and GDP have both positive and negative, with obvious spatial heterogeneity. The findings of the study indicate that soil and water conservation services in the Dongjiang Basin are exhibiting a gradual improvement, but it is still necessary to pay attention to the "L-H" type of areas, focusing on the influence of NDVI, and at the same time fully considering the spatial non-stationarity of other factors, in order to formulate more targeted spatial management strategy for soil and water conservation.
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