基于景观格局的福州LUCC与生态安全响应

LUCC Ecological Security Analysis of Fuzhou Based on Landscape Pattern

以1988年、2000年和2008年福州的土地利用数据为基础,基于GIS空间分析功能,以破碎度、分离度和优势度景观格局指数和景观类型脆弱度为指标,计算生态安全指数,评价研究区景观生态安全的变化趋势.研究结果表明:研究区景观结构变化导致生态安全指数随时间变化,耕地、林地景观生态安全指数有所下降,由于建设用地面积扩大,逐渐占据优势景观地类,由此计算出的区域整体生态安全指标上升.从景观指数看,耕地、林地、水域和未利用地的破碎度、分离度指数变化呈上升或不稳定状态,建设用地的破碎度和分离度指数有所减小;优势景观类型份额有所改变,建设用地对于区域景观的控制作用逐渐加强;景观干扰指数与生态安全指数存在负相关.

Based on the land use data of Fuzhou five districts in 1988,2000 and 2008,supported by the function of GIS spatial analysis,and with the indexes of fragmentation,isolation and dominance,and of vulnerability of landscape types,it was introduced the indexes of ecological security to analyze that temporal characteristic of ecological security.The result shows： the change in landscape structure can strongly influence the indexes of ecological security in the region,which might result in the creasing of the degree of ecological security with the indexes of cultivated land and woodland landscape ecological security decreasing and construction land＇s contrary.The indexes of fragmentation and isolation of cultivated land,woodland,water area and unutilized land are increasing or unstable,and of the construction land decrease;the share of dominance landscape has changed and the control action of construction land to the landscape is being strong;the interference index of landscape and the index of ecological security are negative correlation.