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[1]GAO Feng,HUA Cui,LU Yuan,et al.Assessment of Soil Erosion in Qinjiang Watershed Based on GIS and USLE[J].Research of Soil and Water Conservation,2014,21(01):18-22,28.

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Assessment of Soil Erosion in Qinjiang Watershed Based on GIS and USLE

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 21 Number of periods: 2014 01 Page number: 18-22,28 Column: Public date: 2014-02-28

Title:: Assessment of Soil Erosion in Qinjiang Watershed Based on GIS and USLE

Author(s):: GAO Feng¹, HUA Cui¹, LU Yuan¹, TAO Yan-cheng^2,3; 1. College of Resources and Environmental Sciences, Guangxi Teachers Education University, Nanning 530001, China;;
2. Guangxi Mangrove Research Center, Guangxi Academy of Sciences, Beihai, Guangxi 536000, China;
3. Guangxi Key Laboratory of Mangrove Conservation and Utilization, Beihai, Guangxi 536000, China

Keywords:: soil erosion intensity; GIS; RS; USLE; Qinjiang watershed

CLC:: S157.1

DOI:: -

Abstract:: Soil erosion intensity of Qinjiang watershed was evaluated based on USLE model by applying GIS and RS technology, and analyzing characteristics and disciplines of different elevation, slope and land use types. The results show that: (1) the average soil erosion rate in the whole year was 2 608.87 t/(km²·a), belonging to the moderate erosion, but this level was larger than the soil loss tolerance of 500 t/(km²·a) in north red soil region ruled by the Ministry of Water Resources; (2) based on different altitude gradient in the research area, soil erosion intensity was in reverse proportion to the increase of the elevation gradient, so, the 0～240 m elevations was the key area of soil erosion prevention; (3) based on different slope gradient in the study area, soil erosion intensity was in reverse proportion to the increase of the slope gradient, the slope less than 15° was the key area of soil erosion prevention and management；(4) soil erosion intensity differences under different land use types in study area were significant. Dry farmland, grassland and unused land mainly distributed in the serious erosion area, which was the key land use type to control the whole soil erosion intensity in watershed.

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