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为揭示滨海滩涂地区土壤盐分三维空间分布特点并提供相关技术方法与思路,以苏北海涂围垦区典型地块为例,综合采用三维克里格和随机模拟方法对土体盐分含量的三维空间分布进行估值、模拟与对比分析,并对土体盐分三维分布的空间不确定性进行评价。结果显示,由克里格法得到的土壤盐分空间分布具有明显平滑效应,减小了数据间的空间差异并改变了数据的空间结构;序贯高斯模拟结果整体分布相对离散,突出了原始数据分布的波动性;研究区土壤盐分随深度增加而升高,存在一定次生盐渍化风险;围垦后研究区土壤盐渍化的发生概率已有所降低,轻度盐化土和中度盐化土的高概率区是改良利用的重点区域。该研究表明随机模拟方法能真实地反映土壤属性的三维空间变异特点,其结果亦为围垦区盐渍障碍耕地的治理利用提供了技术对策。
In order to reveal the characteristics of three-dimensional spatial distribution of soil salinity and provide related technical methods and ideas, a typical block of reclamation area in northern Jiangsu Province was taken as an example. Three-dimensional kriging and stochastic simulation were used to analyze the three-dimensional spatial distribution of soil salinity Evaluated, simulated and comparatively analyzed, and evaluated the spatial uncertainty of the three-dimensional distribution of soil salinity. The results show that the spatial distribution of soil salinity obtained by the kriging method has a significant smoothing effect, reducing the spatial difference between the data and changing the spatial structure of the data; the sequential distribution of the Gaussian distribution results is relatively discrete, highlighting the original data distribution The salinity of soil salinization increased with the increase of soil depth in the study area, and there was a certain risk of secondary salinization. The probability of soil salinization in the study area decreased after reclamation, The high probability area of soil is the key area for improvement and utilization. This study shows that the stochastic simulation method can truly reflect the characteristics of three-dimensional spatial variability of soil properties, and the results also provide technical countermeasures for the harness and utilization of saline-contaminated farmland in reclamation areas.