RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2017, Vol. 26 >> Issue (03): 471-479.doi: 10.11870/cjlyzyyhj201703018

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ECO-ENVIRONMENTAL VULNERABILITY EVALUATION IN THE UPPER REACHES OF MINJIANG RIVER

CHEN Jin-yue, WANG Shi-ying   

  1. College of Geography and Resource Science, Sichuan Normal University, Chengdu 610101, China
  • Received:2016-06-22 Revised:2016-09-28 Online:2017-03-20
  • Supported by:
    The analysis and evaluation of Loss Control effect scenario (2013BAC08B03-4), the sub project 3 of China National Science and Technology Support Program "The technology research and demonstration of Southern Red Soil Loss Control"

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Abstract: Eco-environmental vulnerability assesous contradiction between people and land. The paper used the method of weights of evidence (WOE) to assess the landslide vulnerability and used method of Analytic Hierarchy Process (AHP) to assess water and soil erosion, destruction of landscape and pollution vulnerability. The landslide vulnerability evaluation model contains four landslide evaluation factors including slope, aspect, soil properties and rainfall. The paper chose slope, rainfall, soil type and plant cover types as water and soil erosion vulnerability index. Due to the larger landscape of environmental damage by vandalism and greater population density can reflect the extent of the development of land and other natural landscapes, the paper selected population density, plant cover type, slope, rainfall as the main indicators of landscape destruction and pollution. According to the numerical results, three eco-environmental theme's vulnerability was classified into five levels:potential, slight, light, medium, and heavy level by means of the natural breaks law. On this basis, the paper conducted a comprehensive analysis of the study area on each ecological theme. Furthermore, the paper discussed the distribution of ecological fragility of upper reaches of Minjiang River and its spatial distribution under influences of different factors. The results showed that:the landslide vulnerability, water and soil erosion vulnerability, landscape destruction and pollution vulnerability in the study area are generally slight, with a level of 80.43%, 70.44%, and 73.52% respectively. Comprehensive analysis showed that 57.14% of the study area is facing at least one of the ecological problems. 16.6% of the area is facing two or more problems and 1.8% is facing three issues. The paper completed analyses of ecological problems and the underlying influencing factors. The results are expected to benifit ecological security and sustainable development of the Minjiang River Valley and the Yangtze River Basin.

Key words: the upper reaches of Minjiang River, eco-environmental vulnerability, evaluation, WOE, AHP

CLC Number: 

  • X171.1
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