新疆伊犁河谷表层土壤容重的空间变异性分析

发布时间：2018-12-14 08:09

【摘要】：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。
[Abstract]:Bulk density is one of the most basic physical properties of soil, and it is the core index to measure soil degradation. In this paper, the spatial variation characteristics of bulk density of surface soil (0~20cm) were analyzed by using traditional statistics, GIS spatial technique and Kriging spatial interpolation of geostatistics. The results showed that the bulk density frequency distribution of surface soil was normal distribution. The K-S single sample test showed that the kurtosis was 0.14, the deviation was 0.15, and the range of variation was (1.01 ~ 1.50) g / cm ~ (3), the average value was 1.25 g / cm ~ (-1), the average value was 1.25 g / cm ~ (-1). The coefficient of variation is 7.6, which belongs to weak variability. The bulk gold value of surface soil is 0.0056, the base bed value is 0.0083, the block gold effect is 32.5, and the bulk density of surface soil decreases gradually from south to north and from west to east on spatial scale. The common Kriging (Ordinary Kriging) interpolation showed that the bulk density of the topsoil was striped in the north direction and plastered in the east-west direction. Natural factors such as climate and parent material are internal factors of the change of bulk density of surface soil, and land use accelerates the change of soil bulk density.
【作者单位】：新疆大学资源与环境科学学院;中国科学院新疆生态与地理研究所荒漠与绿洲生态国家重点实验室;河西学院历史文化与旅游学院;伊犁哈萨克自治州水利局;
【基金】：国家科技支撑计划项目(2014BAC15B03) 中国科学院“西部之光”一般项目(YB201302) 新疆维吾尔族自治区青年科技创新人才培养工程(2013721050)
【分类号】：S152.5

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