[1]REN Jing,WANG Yu-kuan,XU Pei,et al.Analysis of Water Erosion under Different Precipitation in the Upper Reaches of Yangtze River Basin[J].Research of Soil and Water Conservation,2011,18(04):1-4.
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Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
18
Number of periods:
2011 04
Page number:
1-4
Column:
Public date:
2011-08-20
- Title:
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Analysis of Water Erosion under Different Precipitation in the Upper Reaches of Yangtze River Basin
- Author(s):
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REN Jing1,2, WANG Yu-kuan1, XU Pei1, FU Bin1, CAI Xiong-fei1,2
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1. Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China;
2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China
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- Keywords:
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the upper reaches of Yangtze River Basin; soil erosion; precipitation
- CLC:
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S157.1
- DOI:
-
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- Abstract:
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Based on daily rainfall data recorded by 135 meteorological stations from 1961 to 2009 and multi-year average precipitation data of 225 counties in the Upper Yangtze River Basin, combined with water erosion distribution map calculated by USLE model, the relationship between precipitation and water erosion in the Upper Yangtze River Basin was analyzed through using the spatial analysis function on GIS software. The results show that water erosion accounts for 78% of the whole soil erosion;for the distribution of water erosion and precipitation, although there is significant difference in local area, they are all increasing from west to east. The source region and northwest of Sichuan, where multi-year average precipitation is less than 900 mm, occurs micro-degree water erosion mainly. In central Sichuan, just as uneven precipitation distribution, water erosion is uneven. In the junction of Sichuan and Shaanxi, Sichuan and Gansu, where precipitation grade is 4 to 5 and north of Chongqing where precipitation grade is 7 to 8, water erosion is serious, intensity erosion occurs mainly;middle intensity erosion dominates the region of the northwest of Yunnan, southwest of Chongqing and Yichang of Hubei, where precipitation grade is 7 to 8.The soil erosion index reaches the maximum value (160.5) in precipitation grade 8.This result is close to 2000 Remote Sensing interpretation of soil erosion, revealing the soil erosion distribution features and causes under different precipitation condition in the Upper Yangtze River.