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容重是土壤最基本的物理性状之一,是衡量土壤退化的核心指标,研究其空间变化对防治土壤侵蚀具有重要意义。本文以伊犁河谷为研究对象,运用传统统计学、GIS空间技术和地统计学的Kriging空间插值等方法,分析了表层土壤(0~20cm)容重的空间变异特征。结果表明:表层土壤容重频率分布为正态分布,K-S单样本检验表明,其峰度为0.14,偏度为0.15,变化范围为(1.01~1.50)g/cm~3,平均值为1.25g/cm~3,变异系数为7.6%,属于弱变异性;表层土壤容重的块金值为0.0056,基台值为0.0083,块金效应为32.5%,为中等相关性;空间尺度上,表层土壤容重由南向北和由西向东逐渐减小;普通克里金(Ordinary Kriging)插值表明,表层土壤容重南北走向呈条带状,东西走向呈斑块状分布格局;气候、母质等自然因素是表层土壤容重变化的内在因素,土地利用加速土壤容重的变化。
Bulk density is one of the most basic physical properties of soils, and is the core index for measuring soil degradation. It is of great significance to study the spatial variation of soil bulk density to prevent and control soil erosion. In this paper, the Ili Valley as the research object, the use of traditional statistics, GIS space technology and geostatistics Kriging spatial interpolation and other methods to analyze the spatial variability of surface soil (0 ~ 20cm) bulk density. The results showed that the bulk density of the topsoil was normal distribution, KS single sample test showed that the kurtosis was 0.14, skewness was 0.15, the range of variation was (1.01 ~ 1.50) g / cm ~ 3, the average was 1.25 g / cm ~ 3 and the coefficient of variation was 7.6%, belonging to the weak variability. The nugget value of topsoil bulk density was 0.0056, the abutment value was 0.0083, and the nugget effect was 32.5%, which was moderately correlated. On the spatial scale, Ordinary Kriging interpolation shows that the bulk density of topsoil varies from south to north to strip and east to west are patchy. The natural factors such as climate and parent material are the surface layer The inherent factors of soil bulk density change, land use speed up the change of soil bulk density.