Analysis of spatial heterogeneity of soil substrate in mountainous plain transition area: A case study of Eastern Yi County of Hebei Province
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摘要: 当前地表基质调查工作刚刚起步,多个环节处于探索阶段,其中查清土质地表基质类型及其分布是地表基质调查工作中的一项基本任务。通过对河北省易县东部的山区平原过渡地区开展土质地表基质调查,从分析土质地表基质质地组分(砂粒、黏粒)的空间异质性入手,运用经典统计学和地统计学方法,确定砂粒和黏粒的含量为中等程度的变异,拟合的最优半变异函数模型均为球面模型,在相应变程(7 km)内具有中等程度的空间自相关性,进而确定了研究区最合理的采样网度为6.5 km2/点。分别对砂粒和黏粒组分进行克里金插值,得到研究区土质地表基质的分布格局,总结出土质地表基质的空间异质性特征及规律为: 受高程、坡度、距河流距离等地形因素的影响,偏砂质的土质地表基质出现在高程低、坡度缓、距离河流近的区域; 偏黏质的土质地表基质出现在高程大、坡度陡、远离河流的山区。该研究为土质地表基质调查的工作部署和成果表达提供了基础资料。Abstract: Due to the early stage of current work on ground substrate investigation, and with current exploratory stage of multiple sections, the identification of the types and distribution of ground substrate is a basic task in ground substrate investigation work. In this paper, the authors investigated soil ground substrate in the mountainous plain transition area in Eastern Yi County of Hebei Province, and analyzed the spatial heterogeneity of soil ground substrate texture components (sand and clay). The content of the two components is determined to be a moderate variation, by classical statistics and geostatistics methods. The best fitted semi-variogram models are spherical models, which have a moderate degree of spatial autocorrelation within the corresponding range (7 km), thus the most reasonable sampling network size for the study area is determined to be 6.5 km2/point. Kriging interpolation was carried out for the two components to form a distribution pattern map of soil ground substrate in the study area. Based on this model, the characteristics and laws of spatial heterogeneity of soil ground substrate were summarized as follows: Sandy soil ground substrate appeared in areas with low elevation and gentle slope and close to rivers, and ground substrate of clay soil appeared in mountainous areas with high elevations and steep slopes, and away from rivers, affected by topographic factors such as elevation, slope, and distance from rivers. These achievements could provide a research foundation for the deployment and expression of the results in ground substrate survey work.
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Key words:
- ground substrate /
- content of texture components /
- spatial heterogeneity /
- semi-variogram /
- terrain
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