基于空间分析的土地利用垂直分异研究

QUANTITATIVE STUDY ON HEIGHT DIFFERENTIATION OF LAND USE DEGREE IN THE SUBURBAN COUNTY OF WUHAN CITY BASED ON SPATIAL OVERLAYING ANALYSIS

土地利用现状DTM与DEM进行叠置分析,可以得到不同高程下的土地利用类型数据。依据上述数据对武汉市江夏区的土地利用垂直分异规律进行了研究,内容包括土地利用的垂直结构对比分析及垂直分异规律的定量研究。对不同高程带下的土地利用构成分析可见,土地利用结构呈现明显的垂直变化规律。各种土地类型的绝对数量在区域低海拔段占有绝对优势。而随着高程的增加,土地利用类型明显减少,土地利用的多样性变差。同时,利用刘纪远的土地利用程度综合指数对土地利用垂直分异规律进行定量研究,发现在40m之上和之下土地利用程度呈现出不同的规律性:40m以上土地利用程度随着高程的增加明显下降,高程的自然对数每增加1,土地利用程度扩展综合指数下降42.718;40m以下,土地利用程度综合指数随着高程的增加反而上升。与把空间数据"粗化"和"离散化"到行政单元上的传统作法相比,该研究方法空间信息的损失很小。

The data of land use composition in different height zones can be obtained through the spatial overlaying analysis of the land use with the DEM. Based on the data, the height differentiation of small scale landuse degree in Jiangxia area of Wuhan was studied.The land use structure in different height zones and the quantitative height differentiation of land use degree were analyzed.It is found that the land use structures obviously change vertically through the land use composition in different height zones.The amount of every land use type in lower zones is absolutely more than that of higher zones. And, with the increase of height, the types and the diversification of land use decrease obviously. Meanwhile, it is found that the land use degree appears in different regularity at above 40m or below 40m through the analysis by comprehensive index of land use degree. Above 40m, the land use degree declines with the increase of height. When the nature logarithm of the height increases 1,land use degree index declines 42.718. Below 40m, the land use degree increases with the increase of height.In contrast with the traditional method to coarsen and disperse the spatial data to administration unit, the spatial overlaying analysis can greatly diminish the loss of spatial information.