福建顺昌林地生态脆弱性评价

Forestland Ecological Vulnerability Evaluation in Shunchang County,Fujian Province

以福建省顺昌县林地为对象,通过相关性分析,构建顺昌县林地生态脆弱性评价指标体系;采用主成分分析法和综合指数法实现对顺昌县林地生态脆弱性的定量评价,进而分析其生态脆弱性空间分布特征.结果表明:以坡度、土壤K因子、年均降雨量、NDVI和人口密度5个因子作为生态脆弱性评价指标的权重分别为0.195 5,0.140 9,0.119 2,0.302 1,0.242 3;研究区微度脆弱区、轻度脆弱区、中度脆弱区、强度脆弱区和重度脆弱区的面积分别占15.83%,40.92%,24.50%,13.25%和5.50%,整体处于轻度脆弱水平;顺昌县脆弱等级强度以上的区域主要分布在低坡度、低海拔、低植被盖度、人为干扰强度大的区域,是预防山体滑坡和水土流失的重点区域.

This paper established an ecological vulnerability assessment index system by correlation analysis taking Shunchang County in Fujian Province as sample. Quantitative assessment of ecological vulnerability on the study area was realized through principal component analysis method and comprehensive index method. Then the spatial distribution characteristics of ecological vulnerability was analyzed. The results showed that there were 5 factors selected as evaluation index including slope, soil k-factor, the average annual precipitation, NDVI and population density,their weights were 0. 195 5,0. 140 9,0. 119 2,0. 302 1,0. 242 3 ,respectively. The grades of ecological vulnerability were divided into micro level, light level, moderate level, heavy and extreme level, the vulnerability area of which covered 15.83% ,40.92% ,24.50% , 13.25% and 5.50% ,respectively. The results also demonstrated the overall was in the light level of vulnerability. The area was in the over heavy level mainly distributing the area of low slope,low altitude, low vegetation coverage and human disturbance, which is the key area to prevent landslides and soil erosion.