湖北省耕地生态安全时空演变特征研究

Spatiotemporal Variation Characteristic of Cultivated Land Ecological Security in Hubei Province

耕地生态安全评价是改善耕地生态系统状况、促进耕地可持续利用的重要基础。以湖北省为研究区域,借助DPSIR模型构建耕地生态安全评价指标和熵权法确定指标权重,运用GIS对湖北省耕地生态安全水平和空间分布特征进行定量研究。研究结果表明:1)2002-2011年湖北省耕地生态安全水平总体不断提高,安全等级经历了2002-2006年"风险-敏感"阶段和2007-2011年"临界安全-比较安全"阶段的演变历程;2)2002-2011年的Moran′s I值表明湖北省耕地生态安全水平具有较明显的空间聚集特征,其中2008年Moran′s I值最高;17个单元的局部自相关指数表明湖北省各行政单元的耕地生态安全水平在空间上也具有一定的集聚或分异特征。研究结果可为湖北省耕地生态安全态势的预测与预警、促进耕地可持续利用提供决策参考。

Evaluation of cultivated land ecological security is greatly helpful for improving the state of cultivated land ecosystem and sustainable cultivated land utilization. Taking Hubei Province as the study area, establishes an evaluation index system based on DPSIR and entropy weight method, then uses GIS technology to make a quantitative research of the ecological security level and spatial characteristics of cultivated land. The results indicate that the level of cultivated land ecological security continuously improved from 2002 to 2011. The degree of cultivated land ecological security are generally divided into two stages, which are risk-sensitive stage in 2002-2006 and critical-fairly safety stage in 2007-2011. Moran＇s I indicates that the level of cultivated land ecological security in Hubei Province has spatial gathered characteristics. Moran＇s I in 2008 is highest. The partial self correlation indexes of 17 units show the ecological security level of cultivated land of each administration unit have spatial gathered and differential characteristics. The results are important to provide scientific basis and decision-making reference for ecological security alarm and prediction of cultivated land, and can improve cultivated land sustainable utilization.