Soil Erosion and Its Spatial Distribution Characteristics in Three-River-Source National Park
Journal Title: Bulletin of Soil and Water Conservation - Year 2023, Vol 43, Issue 5
Abstract
[Objective] The Three-River-Source National Park (TRSNP) is considered to be the “water tower of China”, and is an important ecological security barrier in China. The soil erosion distribution law of TRSNP was studied to provide a basis for implementing ecological protection policy, soil and water conservation, and ecological civilization construction in TRSNP. [Methods] Based on the Chinese soil loss equation (CSLE), wind erosion model and freeze-thaw erosion intensity model, the soil erosion status and its distribution characteristics at different space and surface of TRSNP were analyzed by superposition analysis. [Results] In 2020, an area of 2.64×104 km2 suffered from soil erosion in TRSNP. Among the three sub-parks, the Yellow-River-Source Park exhibited the most extensive soil erosion, whereas the Yangtze-River-Source Park was subject to severe erosion comparatively. Soil erosion and its spatial distribution varied significantly at different elevations. Water erosion occurred mainly in the area with elevations above 4 900 m, which occupied 70% of the land area. However, 85% of the wind erosion occurred in zones with elevations less than 4 900 m. The wind erosion area with slopes between 0° and 5° accounted for 60%, which is the relatively concentrated distribution area of wind erosion. And three-quarters of water erosion areas were concentrated in regions where the slope ranged from 8° to 25°, all of which require urgent conservation measures. Grassland was the most important land cover in TRSNP, occupying about 80% of the area, with low and medium-low vegetation cover being responsible for significant soil losses. Additionally, sandy land and bare land were prone to high intensity soil erosion, which deserved special attention. [Conclusion] Two-thirds of water erosion areas were primarily located in zones where the elevation was above 4 900 m, slope gradients were between 8° and 35°, and grassland cover was below medium-low cover. Wind erosion was primarily located at elevations ranging from 4 200 m to 4 900 m, slopes were less than 5°, and grassland coverage was below medium-low cover.
Authors and Affiliations
Tingting Huang, Hui Zhao, Yuan Zhao, Jingyu Ren, Zixuan Li, Binbin Li
Keywords
Related Articles
- EP ID EP762692
- DOI 10.13961/j.cnki.stbctb.20231016.001
- Views 7
- Downloads 0
Effects of Erosion Gully Evolution on Particle Size Distribution and Water Storage Properties in Sloping Cropland of a Black Soil Area
[Objective] The effects of erosion on the surface soil of erosion gullies in sloping cropland soils in a black soil area were studied in order to provide theoretical support for the rational utilization of soil resources...
Estimating Soil Erosion Under Different Soil and Water Conservation Engineering Measures Using LSTM model
[Objective] The soil erosion under different conservation engineering measures was precisely predicted in order to provide a technical and theoretical basis for formulating appropriate conservation measures in Northwest...
Monitoring and Evaluating Carbon Sink Capacity for Comprehensive Management of Soil and Water Conservation in Small Watersheds
[Objective] The carbon sinks of soil and vegetation were monitored and evaluated in order to provide technology and methodology for implementing dynamic monitoring and evaluation of carbon sinks for soil and water conser...
Effects of Freeze-thaw Time and Moisture Content on Shear Strength of Loess Reinforced with Sophora Japonica Roots
[Objective] The reinforcing effects of Sophora japonica roots on soil at different water contents and different thawing times were studied in order to provide a design basis for the soil consolidation effect of Sophora j...
Comprehensive Evaluation of Rural Revitalization Performance in Fujian Province During 2011—2020
[Objective] The rural revitalization performance evaluation index system was constructed based on five dimensions: thriving businesses, pleasant living environments, social etiquette and civility, effective governance, a...