基于DEM的广东省赤红壤全氮含量与地形特征相关分析

以土壤类型图、地形图、全氮图等资料为数据源,利用ArcGIS9.2建立广东省赤红壤数字高程模型(DEM),提取海拔高度、坡度、坡向和地势起伏度,探索大尺度下全氮分布与地形特征的关系.研究表明:全氮含量与海拔高度、坡度和地势起伏度呈负相关关系,并随着海拔高度、坡度和地势起伏度的上升分布面积迅速下降,在坡向上,则主要分布于平坦区域和东南坡.

The Correlation Analysis on the Soil Total Nitrogen Content of Lateritic Red Soil and Terrain Characteristics in Guangdong Province Based on DEM

DEM of lateritic red soil in Guangdong Province was set up by using ArcGIS 9.2 based on soil type map,topographic map,and total nitrogen map data.Altitude,slope,aspect and undulating terrain were extracted to explore the correlation in large-scale between topographic factors and total nitrogen content of lateritic red soil in Guangdong Province.The results show that total nitrogen content of lateritic red soil had high correlation with the distribution area of the indices of height,slope and relief amplitude.The distribution area of total nitrogen content in soil was decreased as those terrain indices increased.As for aspect,the distribution area of soil total nitrogen content was mainly in flat region and south-east slope.