土地生态系统位置型关键地段识别--以无锡市为例

以长江三角洲地区(简称"长三角"地区)的无锡市2005年土地利用数据为基础,采用GIS技术和最小累积阻力面模型,分析了岛屿型和网络型源对应形态特征产生的空间运动潜在趋势,识别出位置型关键地段。结果表明:(1)无锡市有源间连接型关键地段3片23处。入侵用地面积上,宜兴片入侵面积最大,江阴片次之,滨湖片最小;入侵破坏程度上,江阴片最严重,滨湖片次之,宜兴片最少;(2)网络控制型关键地段2片40处。入侵面积和受破坏程度上,滨宜片均大(强)于江阴片;(3)位置型关键地段56处,可划分为2类8种,其中重要地段13处,一般地段43处。位置型关键地段空间分布上均与研究区地貌特征紧密相关。

Identification of Positional Critical Portion of Land Ecosystem -A Case Study of Wuxi City in the Yangtze River Delta Area

Based on land use data of Wuxi City in 2005,the GIS technology and the Minimum Cumulative Resistance Model(MCR model) are applied to analyze the spatial potential developing trends of the sources of archipelago type and network type and identify positional critical portion.Results are as follows:(1) In Wuxi City,the critical portions of sources connecting type are arranged in three parts with amount of 23 patches.The area of invasion in Yixing part is the biggest;Jiangyin part,in the middle;and Binhu part,the smallest.The destroyed degree of invasion in Jiangyin part is the worst;Binhu part,in the middle;and Yixing part,the least.(2) The critical portions of network controlled type are arranged in two parts with amount of 40 patches.From both views of area of invasion and destroyed degree of invasion,Biyi part are bigger or worse than Jiangyin part.(3) The positional critical portions are in amount of 56 patches,which can be classified as two groups and eight sub-groups.Among these portions,the portions with key importance are in amount of 13 patches and the portions with common sense are in amount of 43 patches.The spatial arrangement of positional critical portions has a close relationship with that of physical geographic traits of studied area.