综合兼顾流域因子的云南省星云湖健康评价

Health Assessment of Xingyun Lake in Yunnan Province Taking Account of Basin Impact Factors

[目的]以云南省星云湖为例,尝试兼顾流域因子进行湖泊健康评价,以期为滇中高原湖泊健康评价提供示范和指导作用。[方法]在面向湖泊环境驱动因素调查分析基础上,考虑了来自于流域方面驱动因素对湖泊环境的影响,构建兼顾流域因子的云南省星云湖健康评价的修正指标体系,综合利用遥感与GIS技术,对星云湖的健康状况进行具体量化评价与特性分析。[结果]获得了星云湖在水文水资源、湖泊物理结构、水质、生物和社会服务功能等5个准则层下各指标的量化评价分值;星云湖的健康状况一般,主要制约条件依次是水质、生物、水文水资源的健康状况不理想。[结论]兼顾流域因子的评价方法,在一定程度上改进了目前滇中高原湖泊生态系统健康评价中普遍存在的"就湖评湖"所存在的空间局限,以及由此对相关驱动指标考虑不足的问题;综合兼顾了流域因子的星云湖案例研究,可为滇中高原区域其他湖泊健康评价提供技术路线与评价方法。

[Objective]Taking Xingyun Lake in Yunnan Province as an example,the lake health evaluation,with basin impact factors were taken account to provide reference and demonstration for the health evaluation of the plateau lakes in Central Yunnan Province.[Methods]Based on the investigation and analysis of the driving factors of the lake condition,considering the influence of the impact factors from the basin scale on the lake environment,the revised evaluation index system of the plateau lake considering the basin impact factors was constructed,and the specific quantitative evaluation and characteristics of recognition of Xingyun Lake health status in Yunnan Province were carried out under the support of remote sensing and GIS technology.[Results]The quantitative values of the evaluation indexes under the 5 criterion layers of the Xingyun Lake that include hydrology and water resources,the physical structure of the lake,the water quality,the biological and social service functions were obtained.The overall health status of the Xingyun Lake belongs to the general level.The main constraints originated from water quality,biological,hydrology and water resources.[Conclusion]The assessment index system and method used in this work overcome the spatial scalerestriction that conventionally understand and assess lake degradation problem only from the lake itself and the subsequent insufficient consideration about driving indexes problem.The method and technique applied in the Xingyun Lake health evaluation will give benefit to other plateau lake assessment in Central Yunnan Province.