黄河三角洲地区典型地块土壤盐分空间变异特征研究

针对目前黄河三角洲地区存在的土壤盐渍化问题，以黄河三角洲地区典型地块为研究区，运用经典统计学和地统计学相结合的方法研究了不同深度土层盐分含量的空间变异特征，绘制了各土层盐分的随机性和结构性的半方差图以及空间分布图。结果表明：受内在因子和外在因子的共同作用，各土层含盐量均具有中等的变异强度和空间自相关性，自相关距差异不大。Kriging插值结果表明，研究区内各土层含盐量的空间分布表现为条带状和斑块状分布。微地形和气候条件是影响表层土壤盐分空间变化的主要因素，地下水性质是影响深层土壤盐分空间分布的主要因素。该研究为黄河三角洲地区盐渍化土壤的分区、改良、管理和合理利用提供了理论基础和参考依据。

Spatial variability of soil salinity in characteristic field of the Yellow River Delta

Taking into account the problem of soil salinization existing in the Yellow River Delta at present, spatial variability of soil salinity of different soil layers was measured and analyzed using statistics and geo-statistics, which was performed in characteristic field of the Yellow River Delta. Spatial distribution maps and semi-variograms that can explicitly explain the random and structural variability of soil salinity were also mapped. Results indicate that soil salinity of each soil layer shows the moderate spatial variability and spatial autocorrelation resulting from compound impact of intrinsic and extrinsic factors, and the autocorrelation distance of each soil layer varied insignificantly. The spatial distribution maps of salt salinity interpolated by Kriging interpolation all show apparently strip and block. The spatial distribution of soil salinity for surface layer is chiefly controlled by micro-topography and climate conditions, while the spatial distribution of soil salinity for deeper layers is mainly controlled by groundwater properties. The research results can serve as a theoretical basis and reference to the partition, amelioration, management and rational utilization of saline soils in the Yellow River Delta.