基于熵权物元模型的三峡库区生态敏感性评价

Evaluation of Eco-environmental Sensitivity in Three Gorges Reservoir Area Based on the Entropy-Weighted Matter-Element Model

以三峡库区丰都段为例,选取土壤侵蚀、地质灾害、土地覆被和生境环境作为评价指标,基于熵权物元模型确定各指标权重,利用GIS进行矢量叠加分析,从单因素和多因素对三峡库区丰都段土地生态环境进行了评价及空间分布研究.研究发现研究区域内不敏感、轻度敏感、中度敏感、高度敏感和极敏感5个等级分别为0.01%,19.96%,55.23%,24.65%和0.15%,以中度敏感为主;从空间分布上表现为长江北岸敏感性高于南岸地区.最后提出了相应的保护对策,为区域生态环境保护提供科学依据.

In order to conducted at the Fen provide useful information for regional eco-environment protection, a case study was gdu section of the Three Gorges Reservoir area. With soil erosion, geological disaster, land cover and eco-environment as evaluation indexes, their weights were determined with Information Entropy and Matter-element Model. The local eco-environment and its spatial distribution were evaluated with GIS, using single and multivariate factor analyses. The results showed that the five degrees of eco-environmental sensitivity （insensitive, slightly sensitive, moderate sensitive, highly sensitive and most sensitive） at Fengdu accounted for 0.01%, 19. 96%, 55.23%, 24. 65% and 0. 15% of the total, perceptively. Spatially, the part north to the Yangtze River was more eco-environmentally sensitive to the part south to it. Accordingly, some protection policy options are put forward in this paper.