连云港市土地生态安全动态评价

Dynamic Evaluation of Land Ecological Security in Lianyungang City

在国内关于土地生态安全研究成果的基础上,针对连云港市土地资源利用特点,运用"压力─状态─响应"模型,构建了连云港市土地生态安全评价指标体系,采用熵权法确定指标权重,通过加权求和对2000～2009年连云港市的土地生态安全进行了评价。结果表明:土地生态安全综合指数由2000年的0.4139提高到0.6069,土地生态安全状况整体呈上升趋势。从各子系统看,连云港市土地生态压力指数处于波动下降的趋势,土地生态压力不断增大;土地生态安全现状有所恶化;随着投入的增加,响应系统安全状况有逐步上升趋势。耕地面积比重、城市化水平、单位耕地农机动力、人均GDP、人均耕地面积对连云港土地生态安全影响较大。

According to domestic research results of land ecological security and the utilization characteristics of land resources in Lianyungang city, the paper built land ecological security assessment index system based on the ＂ pressure - state - response＂ model, and the entropy weight method was used to determine the weight of each index. The land ecological security of Lianyungang city during 2000 ～ 2009 was evaluated by using weighted summation. The results showed that the comprehensive index of land eco- logical security increased from 0.4139 to 0. 6069 during 2000 ～ 2009, indicating that the overall land ecological security had a rising trend. As for each subsystem, the land ecological pressure index in Lianyungang city gradually declined with fluctuation, and the land ecological pressure was constantly increasing. The land ecological security status became deteriorated. With the increase of input, the security situation of the response system revealed a gradual rising trend. The arable land area proportion, urbanization level, power of agricultural machinery per hectare cultivated land, per capita GDP and per capita arable land area had great influence on land ecological security in Lianyungang.