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《Journal of Arid Land Resources and Environment》 2017-09
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Assessment of soil erosion sensitivity in the upper reaches of Minjiang River

GONG Xuemei;FENG Wenlan;ZHENG Jie;HUANG Yuqian;WANG Fengjie;Chengdu University of Information Technology,College of Resources and Environment;  
The upper reaches of Minjiang River belong to a typical fragile ecosystem in southwestern mountainous areas of China. The assessment of soil erosion sensitivity could provide scientific basis for the protection of the ecological environment and the maintenance of ecological security in the mountains. The combination method of GIS,RS and RUSLE was used to calculate the sensitivity index of soil erosion in 1995,2000,2005,2010 and 2014,and the dynamic effects of the human disturbance and Wenchuan Earthquake on the soil erosion sensitivity were analyzed. The results showed that:( 1) soil erosion sensitivity of the upper reaches of Mingjiang River was mainly dominated by slightly sensitive and moderately sensitive,while some highly sensitive and extremely sensitive areas mainly distributed in the arid valley area and mountain bare soil area of the upper reaches of Minjiang River. From 1995 to 2004,the soil erosion sensitive was relatively stable as a whole and the mean coefficient of variation was 0. 05,but the comprehensive index of the soil erosion sensitivity displayed a general downward trend.( 2) Wenchuan earthquake enhanced the sensitivity of soil erosion in places where the seismic intensity was relatively high. By 2014,area proportion of the highly sensitive areas reduced and the ecological restoration was obvious.( 3) The land use changes caused by the human disturbance could enhance the soil erosion sensitivity,while those caused by environmental protection engineering reduced the sensitivity.
【Key Words】: soil erosion sensitivity RUSLE land use upper reaches of Minjiang River
【Fund】: 国家自然科学基金项目(41301653)资助
【CateGory Index】: S157.1
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