基于景观异质性的云南省红河县生态风险评价研究

Ecological risk assessment of Honghe County in Yunnan Province based on landscape heterogeneity

【目的】对云南省红河县的生态风险进行评价.【方法】以云南省红河县景观生态系统为研究对象,借助GIS技术,应用多样性指数、分离度指数、破碎度指数、分维数倒数等一些基于异质性的指标对各研究单元的景观干扰度和景观脆弱度进行特征化分析,并以此为依据,确定风险受体、生态终点,进而计算各研究单元的生态风险值并对其评价.【结果】研究区域各单元破碎度介于0.1-0.4之间,多样性介于0.75-1.36之间,均匀度指数介于0.38-0.65之间.整个研究区域生态风险值介于4.22-13.6之间,迤萨镇最大为13.6,石头寨乡最小为4.22;红河县高、较高等级的风险区占到全县面积的36.9%.【结论】云南省红河县生态风险防范的任务相对繁重.

【Objective】To assess ecological risk of Honghe County in Yunnan Province.【Method】Taking landscape ecosystem of Honghe County as research object,based on GIS technology,applying some indicators related to heterogeneity such as diversity index,separation index,fragmentation index and reciprocal of fractal dimension to analyze landscape disturbance and landscape vulnerability characteristics of each study unit,thereby determine risk receptors and ecological endpoints,then calculate and assess ecological risk value.【Result】The fragmentation index was between 0.1to 0.4,diversity index was between 0.75to1.36,evenness index was between 0.38 to 0.65,ecological risk values of the whole region was between4.22to13.6,the maximum was 13.6in Yisa Town,the minimum was in Shitouzhai Township.The highgrade and relatively high-grade risky area accounted for 36.9percent of the entire research area.【Conclusion】Ecological risk management is a heavy task in Honghe County.