邛海流域生态脆弱性及其评价研究

Ecological fragility of Qionghai Lake basin and its asssessment

目前,邛海流域生态环境问题日趋严重,表现出明显的生态脆弱特征。本文对其特征表现作了阐述,从自然和人为因素两方面对其成因进行了综合分析,指出流域存在四类结构型脆弱因子及三种人为型胁迫因子。在此基础上,建立了一套流域生态脆弱性评估指标体系,运用层次分析法(AHP)对流域生态脆弱性作了定量评估。评估结果显示,邛海流域生态脆弱度综合指数为3.035,已呈中-强脆弱程度。评估亦识别出影响脆弱性的主次因子,并据此探讨了流域生态环境改善的途径。

At present, the problem of ecological fragility is becoming more serious in Qionghai Lake basin, Sichuan Province. In this paper, the fragile characteristics of Qionghai lake basin were analyzed, with four structurally vulnerable factors and three artificially menacing factors which caused the problem put forward. The index system of fragility was set up, and the assessment of fragile degree was further implemented by means of AHP. The results showed that the value of integrated index was 3. 035, and the fragility degree reached mediumstrong level. The assessment identified the primary and secondary factors, with which, the related restoration and control strategies were approached based on the current conditions of the eco-environment.