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Geoscience ›› 2024, Vol. 38 ›› Issue (03): 683-693.DOI: 10.19657/j.geoscience.1000-8527.2024.031

• Observation Simulation and Prediction Evaluation of Superbiotic Resources • Previous Articles     Next Articles

Spatial-temporal Variations of Soil Erosion and Quantitative Attribution Analysis in the Dry-hot Valleys of the Jinsha River: A Case Study of Yuanmou County, Yunnan

WEI Zong1,2,3,4(), YANG Chaolei1,2,3,4(), TIAN Yufeng1,2,3,4, YANG Jinjiang1,2,3, HUANG Yong1,2, HE Feng1, ZHU Zhiping1   

  1. 1. Kunming General Survey of Natural Resources Center, China Geological Survey, Kunming, Yunnan 650100, China
    2. Yunnan Provincial Field Science Observation and Research Station on the Evolution of Soil and Water Resources and the Carbon Sequestration Enhancement Effects in the Alpine Gorge Area of the Jinsha River, Chuxiong, Yunnan 651400, China
    3. Natural Ecosystem Carbon Sink Engineering Technology Innovation Center, Kunming, Yunnan 650100, China
    4. Key Laboratory of Natural Resource Coupling Process and Effects, Beijing 100055, China
  • Online:2024-06-10 Published:2024-07-04

Abstract:

The temporal and spatial evolution of soil erosion in the dry-hot valley of Jinsha River is of great significance for ecological safety and safe operations of downstream water conservancy and hydropower. We analyzed the spatial and temporal changes of soil erosion using GIS technology and RUSLE model in Yuanmou County, Yunnan, from 2015 to 2021. The main factors affecting the distribution pattern of soil erosion in Yuanmou County were ide.pngied by using the geographical detector model. The results showed that (1) the average annual soil erosion modulus and total soil erosion show decreasing trends from 2015 to 2021, and the soil erosion modulus was decreased by 16.53% during the period. (2) The spatial variation of soil erosion was pronounced, with being high erosion in the north and low in the south along the Jinsha River. In terms of erosion intensity, the area of slight and mild erosion accounts for more than 95% and other erosion areas are relatively smaller. (3) During the study period, the areas with high soil erosion intensity in Yuanmou County shows a trend of slight erosion transformation, indicating that the implementation of regional farmland conversion to forest and grassland and soil erosion control projects in small watershed have alleviated the soil erosion intensity. (4) Slope was the dominant factor affecting the distribution pattern of soil erosion in Yuanmou County, with the strongest explanation of 25.66%. Along the Jinsha river, the regions at the elevation of 1,200-1,800 m with the slope >25°, 30%-40% vegetation coverage zone are in high risk of soil erosion, therefore ecological restoration and protection of soil and water should be strengthened in those areas.

Key words: soil erosion, dry-hot valley, RUSLE, geographic detector

CLC Number: