基于GIS的衡阳市生态环境脆弱性研究

Study on the Vulnerability of Ecological Environment in Hengyang City Based on GIS

从研究衡阳市生态环境形成的客观条件入手,研究了衡阳市的7个县或县级市生态环境脆弱性4个方面的影响因素,确定了8个评价指标,利用层次分析法,得到评价指标对应的相对权重,并通过一定的评价模型得出各个评价单元相应的生态环境脆弱性量化值。评价结果将其生态环境分为5类:极端脆弱区(衡阳县)、严重脆弱区(衡南县和祁东县)、中等脆弱区(衡东县)、轻度脆弱区(常宁市)和潜在脆弱区(衡山县和耒阳市),并借助GIS软件得出了衡阳市生态环境脆弱性综合评价图。最后,针对评价结果提出了衡阳市生态环境管理的对策。

Based on the objective conditions which has formed Hengyang ecological environment, this paper studied the impact of the four factors of the ecological environment vulnerability about the seven counties or county-level cities of Hengyang city, and determined eight evaluation indicators, use the analytic hierarchy process, indicators the relative weights of corresponding evaluation, and through the evaluation model, obtaining all quantitative ecological environment vulnerability of the evaluation units. Evaluation results divided the ecological environment into five groups ： extreme frail area （Hengyang County）, serious frail area （Heangnan County and Qidong County）, medium frail area （Hengdong County）, mild frail area （Changning City） and latent frail area （Hengshan County and Leiyang City）, and made the Hengyang ecological environment frail comprehensive evolution map. Finally, the Hengyang ecological environment management measure was proposed in view of the measured results.