中文摘要：

【目的】掌握林地脆弱性空间分布状况的基础数据,为指导森林经营管理、提高区域森林生态系统稳定性奠定基础。【方法】以福建省永安市的林地为研究对象,对林地脆弱性评价指标进行相关分析和筛选处理,咨询相关专家并采用模糊层次分析法确定各林地脆弱性指标权重,结合综合指数法实现对林地脆弱性的测定,最后通过模糊聚类、加权分析划分了林地脆弱性的5个等级。【结果】干扰指数、地形起伏度、坡度、降雨侵蚀力R因子和土壤可蚀性K因子为林地脆弱性测定指标,其权重分别为0.374 9,0.301,0.215 5,0.0791,0.029 5。永安市林地脆弱性等级为1～5级的林地面积分别为20 559.96,76 930.58,109 373.63,35 572.96和7 065.81hm2。【结论】福建永安市的林地脆弱性处于等级3以下的林地面积为206 864.17hm2,占林地总面积的82.9%,总体处于较稳定状态。

英文摘要：

【Objective】 Obtaining the basic data of forestlands fragility distributions was essential for guiding forest management and increasing the stabilities of regional forest ecosystems.【Method】 The factors of forestland fragility in Yong＇an City were selected using correlation analysis.The weights of these factors were decided by the Fuzzy Analytic Hierarchy and advices from the relevant experts.The forestland fragilities were classified into 5 grades by the Fuzzy clustering analysis and the weight processed.【Result】 Human disturbance index,amplitude of landforms,slope,rainfall R factor and soil erosion K were selected as evaluation factors for forestland fragilities and their weights were 0.374 9,0.301,0.215 5,0.079 1,0.029 5,respectively.The areas of fragility grades from 1 to 5 were 20 559.96,76 930.58,109 373.63,35 572.96 and 7 065.81 hm2,respectively.【Conclusion】 The forestland below grade 3 is 206 864.17 hm2,accounting for 82.9% of the total forest land,which indicates that the forestlands in Yong＇an City are stable.