武汉市江夏区土地利用程度的垂直分异

QUANTITATIVELY STUDY ON HEIGHT DIFFERENTIATION OF LAND USE DEGREE OF JIANGXIA DISTRICT OF WUHAN CITY BASED ON EXPENDED COMPREHENSIVE INDEX

利用DEM和中国资源环境数据库中该区域的土地利用空间数据库进行叠置分析 ,得到武汉市江夏区不同高程下的土地利用信息 ,以高差 10m为指标划分为若干高程带经统计分析得到各带的土地利用结构数据 ,以增加分级的形式 ,利用所建县级小尺度土地利用研究的土地利用程度扩展指数 ,对土地利用程度的垂直分异规律进行了定量研究。结果表明 ,在 40m之上 ,该指数随着海拔高度自然对数的增加而下降 ,而且与海拔高度的相关程度很高 ;在 40m以下 ,却随着海拔高度的增加而增加。作者认为水分过多是土地利用的最大限制因素 ,该区的土地利用存在着一个最适宜海拔高度 ,即 40m左右。

Through increasing land use grades,the expended model of land use degree was built,based on the land use degree comprehensive index.The land use degree expended comprehensive was applied to the study of land use height differentiation of Jiangxia District of Wuhan City,in which the height belt divided by 10 m.It was found that the index changes in different trends under or above 40 m about.Above 40 m about,the land use degree index decreases with the increasing the nature logarithm of height.However,under the 40 m about,the index increases with the increasing of height.Through the land use type and soil category analyses,it was fount that too much water is the biggest restrictive factor of land use under soil category analyses,it was fount that too much water is the biggest restrictive factor of land use under the 40 m about.And,with the increasing of height under 40 m about.At the meanwhile,there is the most suitable height of land use and 40 m about is the height of Jiangxia District.