湖北省潜江市土地生态脆弱性时空分析

Spatio-Temporal Analysis on the Land Ecological Vulnerability in Qianjiang City, Hubei Province

研究目的:为土地生态系统脆弱性的定量评价提供借鉴方法,构建扰动力指数和适应力指数耦合关系的评价模型,研究县级资源枯竭型城市土地生态时空演化状况。研究方法:集对分析方法、景观指数分析法、RS/GIS。研究结果:2000—2009年潜江市土地生态扰动力指数由0.449上升至0.546,石油天然气产值占规模以上产值比重是首要影响因素;土地生态适应力指数由0.663持续下降至0.337,其中分离度和多样性指数的变化是关键因素;土地生态脆弱性指数由0.380上升至0.617,脆弱性不断升高。研究结论:"十五"、"十一五"计划期间,资源开采业对资源枯竭型城市土地生态环境的压力明显,土地生态的适应力和脆弱性不容乐观。

The purpose of the paper is to develop a model to assess the vulnerability of land ecological system combining the disturbance index and the response capacity index, and further analyze the spatio-temporal change of land ecological system in a resource-exhansted city. Methods of set pair analysis, landscape pattern indices, RS/GIS were employed. The results show that the land ecological disturbance index increased from 0.449 to 0.546, and ratio of oil ＆ gas output to scale industrial output is the dominant factor. Meanwhile the response capacity index decreased from 0.663 to 0.337, and the SPLIT and SHDI were the key factors. In general, land ecological vulnerability index increased from 0.380 to 0.617, which indicated that land ecosystem became worse and worse. It is concluded that during the tenth and eleventh five-year plan, industrial resource exploitation had obvious pressure on the ecological environment of recourse-exhansted city, and that the adaptation capacity and ecological vulnerability of land ecosystem were hardly optimistic.