河南省土壤侵蚀时空分异特征及土壤保持经济价值OA北大核心CSTPCD

Mastering the spatio-temporal variations in soil erosion and its economic value is of great significance for the comprehensive management of river basins and the stable performance of soil conservation functions.Most existing studies tend to use the superposition of multi temporal soil erosion spatial distribution maps and equivalence method to explore the spatio-temporal pattern and economic value of soil erosion,but the spatial differentiation and dynamics of soil erosion were often overlooked.Taking Henan Province as an example,based on the RUSLE model,the parameter factors in the model were determined through data such as rainfall,soil particle composition,land use type,digital elevation,and remote sensing images to quantitatively analyze the spatio-temporal distribution characteristics of soil erosion in the region from 2000 to 2020.Exploratory Spatial Data Analysis(ESDA)and the geographical detector method were employed to explore hotspot areas of soil erosion and their driving factors.The economic value of soil conservation was assessed using the replacement cost method.The results show that:1)the overall erosion area of moderate to mild and above in Henan Province showed a decreasing trend,reaching its lowest point in 2015.2)The spatial distribution and evolution of soil erosion in Henan Province displayed an obvious spatial aggregation effect,with soil erosion intensity showing a positive spatial correlation(the global Moran's I index ranged from 0.450 to 0.705).The area of the"high-high"aggregation zones has significantly decreased,and the aggregation trend has shown an overall weakening with slight expansion.The hotspots of soil erosion were primarily distributed in Anyang,Hebi,Jiyuan and Sanmenxia cities.3)Rainfall and slope were primary environmental drivers affecting soil erosion,with single-factor q values ranging from 77.7%to 79.1%for rainfall and from 43.7%to 82.2%for slope,respectively.Areas with rainfall of 3.28×102‒6.43×102 mm and steep slopes greater than 29.0° were high-risk areas for soil erosion.Vegetation coverage was found to have a significant inhibitory effect on the soil erosion process,with single-factor q values ranging from 16.1%to 19.4%,and the q values for the interaction of any two factors ranging from 40.0%to 83.9%.4)The economic values of soil conservation were notably fluctuating,with values of 8.36×109,8.21×109,9.26×109,3.52×109 and 7.17×109 yuan from 2000 to 2020,respectively.The research results can provide theoretical reference and decision-making basis for improving soil conservation function and economic value by clarifying the current situation and driving factors of regional soil erosion.