黄河流域土壤侵蚀时空演变与格局特征

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黄河流域土壤侵蚀时空演变与格局特征

2023-06-05 08:10| 来源: 网络整理| 查看: 265

The soil erosion in China was characterized by various types and complicated processes. It is of great significance to accurately quantify the temporal variation and spatial patterns of soil wind erosion and water erosion intensity in watersheds, to identify regional dominant erosion types for reasonable arrangement of soil and water conservation measures. This study quantified the temporal and spatial patterns and evolution of soil wind erosion and water erosion intensity in the Yellow River Basin from 2000 to 2020 combined remote sensing monitoring, field survey, and model simulation, revealed soil erosion type area, and its significance to zoning control of soil erosion. The results showed that: (1) The intensity of soil wind erosion and water erosion in the region showed a downward trend as a whole, while the wind erosion and water erosion showed a fluctuation and continuous decrease, respectively. In the past 20 years, the modulus of soil wind erosion and soil water erosion have respectively decreased at a rate of 18.88 t·km-2·a-1 and 34.98 t·km-2·a-1. (2) The type zones dominated by soil wind erosion and soil water erosion accounted for 16.35% and 83.65% of the total land area of the region, respectively, and the overall performance of soil erosion type zoning from north to south was the transition from soil wind erosion to water erosion. The areas dominated by soil wind erosion were distributed in the upper reaches of the main stream of the Yellow River and the Ordos inland flow area, accounting for 41.53% and 28.57% of the area of soil wind erosion area, respectively. Moderate erosion intensity of soil wind erosion accounted for the largest proportion, 24.72%. The areas dominated by soil water erosion were distributed in the middle reaches of the Yellow River (25.04%), the Wei River-Yiluo River system (22.06%), the source water system of the Yellow River (18.60%), the upper reaches of the Yellow River (15.49%), Huangshui-Taohe River System (13.35%). Soil water erosion was mainly micro-erosion intensity, accounting for 49.30% of the soil water erosion area, and light (17.28%), moderate (14.98%) and strong erosion intensity (11.95%) were widely staggered. (3) Desertification control project and soil and water conservation engineering made soil erosion modulus and erosion intensity decrease significantly in areas with strong wind and water erosion. According to the zoning characteristics of soil erosion types, the measures of vegetation restoration and agricultural oases in the soil wind erosion area were discussed. Agricultural cultivation measures, forest and grass measures and engineering measures are used to protect and control soil water erosion areas, in order to provide scientific guidance for the high-quality development of the ecosystem in the Yellow River Basin.

Keywords: soil wind erosion ; soil water erosion ; spatio-temporal evolution ; dominant erosion type ; Yellow River Basin



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