基于GIS的冀西北高原土壤性状空间变异性研究

运用地理信息系统(GIS)技术和地统计学方法,研究了冀西北波状高原地貌下小流域农田土壤养分的空间变异性,探讨了地形因子与土壤砾石、养分含量空间分布的相关关系。结果表明:各种养分要素均表现明显的空间相关性,并不同养分均具有小变程特点:土壤中>5 mm和5~2 mm砾石分布与海拔为正相关关系,除速效磷外,各养分要素与海拔为负相关关系。各粒径砾石及各土壤养分含量的空间分布都与坡度和坡向的相关性很小。明确地形因子与土壤性状空间变异的相关特性,为区域合理进行土地保护与植被配置提供了理论及技术依据。

GIS-based study on spatial variability of soil characteristics in north- west plateau of Hebei

By using the technology of geographical information systems(GIS) and geostatistic,the study explored the spatial variability of the soil nutrients of undulant valleys in north-west plateau,and the correlation between topographical factors and soil gravel and nutrients.The results showed that the factors of soil nutrients had significant spatial correlation while the nutrients featured small change.The gravel of >5 mm and 5～2 mm were positively correlated with altitude and the factors of nutrient were negatively correlated with altitude except the available P.The spatial distribution of the granular diameter and the content of soil nutrients were slightly correlated with the slope and aspect.The study aims to provide the theoretical and technological evidence for soil protection and regional vegetation configuration,and to identify the definite correlation between topographical factors and spatial variability of soil.