[1]YAO Kun,ZHOU Bing,LI Xiaoju,et al.Evaluation of Ecological Environment Vulnerability in the Upper-Middle Reaches of Dadu River Basin Based on AHP-PCA Entropy Weight Model[J].Research of Soil and Water Conservation,2019,26(05):265-271.
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Evaluation of Ecological Environment Vulnerability in the Upper-Middle Reaches of Dadu River Basin Based on AHP-PCA Entropy Weight Model
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
26
Number of periods:
2019 05
Page number:
265-271
Column:
Public date:
2019-09-06
- Title:
- Evaluation of Ecological Environment Vulnerability in the Upper-Middle Reaches of Dadu River Basin Based on AHP-PCA Entropy Weight Model
- Keywords:
- environment vulnerability; characteristics of spatial-temporal differentiation; GIS; Dadu River Basin
- CLC:
- X826
- DOI:
- -
- Abstract:
- The middle-upper reaches of the Dadu River Basin are important ecological barriers and functional areas in the upper reaches of the Yangtze River, and it is helpful to realize the protection of regional ecological environment to grasp the real situation of its ecological environment vulnerability in time. We select nine indexes from topography, climate, vegetation and so on, and combine GIS technology and AHP-PCA entropy combination weight model to complete the evaluation and analysis of ecological environment vulnerability in the study area in different period 2000-2015. The following results are obtained. (1) The vulnerability of ecological environment in watershed area shows obvious vertical gradient change, and the vulnerability of south to north gradually decreases. (2) In the study, the vulnerability index can be divided into five grades, the difference of the area between the different grades are obvious, the degree of mild and the potential to moderate, and the area of light and following vulnerable areas reach up to more than 80% of the whole region, which is at the level of the medium vulnerability. (2) During the study period, the comprehensive indexes of ecological environment vulnerability in different periods were 2.552 1, 2.541 0, 2.517 0 and 2.494 9, respectively, and the overall development trend of the region showed the obvious improvement. (4) The improvement of ecological environment in the middle and upper reaches of the basin was mainly due to the implementation of the national series of ecological environmental protection and reconstruction projects, and the extensive development of hydropower resources also had a certain impact on the intensification of its vulnerability. (5) Finally, the study aims at the restoration and reconstruction of ecological environment in this area, the area can be divided into 3 harnessing regions in terms of the situation of the area, and corresponding suggestions on each harnessing region are put forward.
- References:
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1900-01-01