红壤丘陵区土壤有机质空间异质性分析——以长沙市为例

以红壤丘陵区典型区域长沙市为例,在地理信息系统和遥感技术的支持下,研究了长沙市土壤有机质的空间分异规律及其与土地利用之间的关系.分析结果表明,长沙市土壤中有机质含量总体较高,有机质含量大于1%的区域占研究区域总面积的85%以上.空间异质性研究表明,长沙市土壤有机质的破碎程度不明显,其最大的破碎度指数仅为0.078 09,而分离度指数则较明显,最大达到0.8372.土壤有机质和土地利用方式关系研究表明,土地利用和土壤有机质之间有着非常密切的关系,是导致土壤有机质空间分异的关键因素.

Analysis of the Spatial Heterogeneity of the Soil Organic Matter in Hilly Red Soil Region——A Case Study in Changsha City

Supported by GIS and RS,this paper studied the spatial heterogeneity of the soil organic matter and the relationship with land use in Changsha city. The result showed that the soil organic matter content of soil was much higher in Changsha city as a whole.The area of land with an organic matter content higher than 1.00% reached 10 328.60 km~2,constituting 87.86% of the total area.According to the spatial heterogeneity analysis,it could be concluded that the fragmentation index for each type of soil organic was small,and the maximum index was only 0.07809;while the separation index was big,and the maximum index was(0.873()2).The analysis for the relation between soil organic matter and land use showed that land use was one of the critical factors which contributed to the spatial heterogeneity of soil organic matter.