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Estimate of Soil Erosion Modulus of the Watershed in Karst Region GIS-based——A Case Study of Maixi River Basin in Guiyang

Bai Peng-fu

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Abstract

Soil erosion is one of the main ecological problems in karst basin.The data on meteorology,soil and land use of Maixi River Basin in Guiyang were collected.3S technology was used to establish the spatial database of soil erosion.Evaluational model of soil erosion was constructed by applying USLE model.The modulus estimates of soil erosion was performed by using GIS spatial data processing method.The results showed that annual soil erosion rate of Maixi River Basin was 1 230.81 t/(hm2·a),the type of erosion intensity was dominated by micro and mild degree,the type of moderate to severe erosion occurred mainly in the location of the slope gradient greater than 25° and poor vegetation coverage,especially dry type.From the point of sub-basin of view,soil erosion of the seventh sub-basin of Mainai River was more serious.

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What this paper is about

Soil erosion is one of the main ecological problems in karst basin.The data on meteorology,soil and land use of Maixi River Basin in Guiyang were collected.3S technology was used to establish the spatial database of soil erosion.Evaluational model of soil erosion was constructed by applying USLE model.The modulus estimates of soil erosion was performed by using GIS spatial data processing method.The results showed that annual soil erosion rate of Maixi River Basin was 1 230.81 t/(hm2·a),the type of erosion intensity was dominated by micro and mild degree,the type of moderate to severe erosion occurred mainly in the location of the slope gradient greater than 25° and poor vegetation coverage,especially dry type.From the point of sub-basin of view,soil erosion of the seventh sub-basin of Mainai River was more serious.

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Available abstract

Soil erosion is one of the main ecological problems in karst basin.The data on meteorology,soil and land use of Maixi River Basin in Guiyang were collected.3S technology was used to establish the spatial database of soil erosion.Evaluational model of soil erosion was constructed by applying USLE model.The modulus estimates of soil erosion was performed by using GIS spatial data processing method.The results showed that annual soil erosion rate of Maixi River Basin was 1 230.81 t/(hm2·a),the type of erosion intensity was dominated by micro and mild degree,the type of moderate to severe erosion occurred mainly in the location of the slope gradient greater than 25° and poor vegetation coverage,especially dry type.From the point of sub-basin of view,soil erosion of the seventh sub-basin of Mainai River was more serious.

Key concepts: Hydrology (agriculture), Erosion, Watershed, Karst, Drainage basin, Environmental science, Structural basin, Vegetation (pathology)

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Estimate of Soil Erosion Modulus of the Watershed in Karst Region GIS-based——A Case Study of Maixi River Basin in Guiyang — Research Paper | ScholarLens