喀斯特石漠化生态系统恢复力评估——以广西环江毛南族自治县为例

Evaluation of Resilience of Karst Rocky Desertification Ecosystem:A Case Study of Huanjiang Maonan Autonomous County,Guangxi

为探明喀斯特石漠化地区生态系统的恢复力,本研究以广西典型喀斯特石漠化地区——环江毛南族自治县为研究区域,运用指标评价法,从影响生态系统恢复力大小的自然因素和人为因素中筛选出11个指标,构建喀斯特石漠化生态系统恢复力指标评价体系;采用专家打分法和变异系数法(组合赋权法)确定评价指标的权重,并运用空间加权叠加的方法定量计算出环江喀斯特石漠化生态系统恢复力的大小,同时使用自然断点法对评价结果进行等级划分。结果表明:环江喀斯特石漠化生态系统恢复力为0.35-0.71,整体为中等水平;在空间分布上,环江喀斯特石漠化生态系统恢复力表现出南北低、西中高的分布状况,特别是北部和南部喀斯特地貌分布地区的恢复力较低。研究结果可为有关部门对石漠化生态系统的有效管理提供重要参考信息。

In order to explore the resilience of ecosystem in karst rocky desertification area,this study takes Huanjiang Maonan Autonomous County,a typical karst rocky desertification area in Guangxi,as the research area.By using the method of index evaluation,11 indexes are selected from the natural factors and human factors affecting the ecosystem resilience,and the evaluation index system of karst rocky desertification ecosystem resilience is constructed.The expert scoring method and the coefficient of variation method(combined weighting method)are used to determine the weight of the evaluation index,and the spatial weighted superposition method is used to quantitatively calculate the resilience of the karst rocky desertification ecosystem in the Huanjiang,and the natural breakpoint method is used to classify the evaluation results.The results showed that the resilience of karst rocky desertification ecosystem in Huanjiang was 0.35-0.71,and the overall level was medium.In terms of spatial distribution,the resilience of karst rocky desertification ecosystem in Huanjiang is low in south and north and medium in west,especially in the northern and southern karst landform distribution areas,the resilience is low.The research results can provide important reference for relevant departments to effectively manage rocky desertification ecosystem.