基于P-S-R模型的汕头市土地生态安全评价

Evaluation on Land Ecological Security in Shantou Based on P-S-R Model

汕头作为中国首批经济特区之一,人多地少是其一大特点,经历30a特区的建设和发展,在经济发展同时其生态环境也发生了较大的变化。以经济特区汕头市社会经济发展特点为出发点,基于P—S—R模型构建了一套包含3个准则19个指标的土地生态安全评价指标体系,采用主成分分析法确定指标权重,依据土地生态安全综合指数法对2001—2008年汕头土地生态安全状况进行了评价。结果表明:2001—2008年汕头市土地生态安全值在0.65上下摆动,变化幅度不大(不超过0.034 8),介于临界安全和较安全等级,说明研究期内汕头市土地生态环境总体较好,土地生态系统结构较完整,土地生态系统服务功能基本完善,受干扰后一般可恢复。该研究可为了解汕头市土地生态安全现状,及未来生态环境质量改善和生态安全规划管理提供依据。

As one of the first Special Economic Zones in China,Shantou has a large population,with relatively little （arable） land. During the past 30 years,with the rapid economic growth,the ecological environment of Shantou also got through great changes. Using the Socio-economic development characteristics of Shantou as a case,we established land ecological security assessment system which was based on the ＇P-S-R＇ concep tual framework mode, with the main data sources of 2001--2008 Shantou Statistical Yearbook, 2001-2008 Shantou Environmental Bulletin, etc. Then 19 indexes according to the concrete features of Shantou City were selected by using principal components analysis method and analytical hierarchy process theory, with referring to related literatures and studying achievements to confirm the weight of indexes, so as to evaluate the safe condition of land ecological security at Shantou from 2001 to 2008. Finally, the result of calculation showed that the integrated value of the land ecological security at Shantou was between adjacent safety and comparative safety statement, yet, with the trend of slight decline, which indicated that it was necessary to take measures to improve Shantou＇s land ecological environments. This research showed the current situation of Shantou, which was a reference for land ecological security planning and ecological security management.