基于D-S证据理论的土壤潜在盐渍化研究

该文以山东禹城20世纪80年代第二次土壤普查资料为基础,在GIS和Dempster-Shafer证据理论的支持下,旨在探讨影响土壤盐渍化的因子作用下引发的土壤潜在盐渍化的概率分布状况。该文主要利用模糊函数集中的“J”形模型和Dempster-Shafer-Weight-of-Evidence(D-S证据理论)模型对影响土壤盐渍化因子进行运算和合并,预测土壤潜在盐渍化现象在整个栅格表面发生的可信度,并运用专家知识评价存在的因子,获得了研究区土壤潜在盐渍化的概率表面图。结果表明:土壤盐渍化分布不仅具有空间变异性,在局部也存在着一致性,即在地形、地貌基本一致的前提下,在一定的距离范围内,越靠近盐渍化土地的区域,发生盐渍化的可能性越大,地下水埋深和地下水矿化度是影响土壤潜在盐渍化分布的两个关键因子。

Potential soil salinization using Dempster-Shafer evidence theory

Based on soil investigation data from Yucheng City in Shandong Province in 1980, using GIS (Geographic Information System) and Dempster-Shafer evidence theory, the probability of potential soil salinization affected by many factors was explored. In this paper, the authors make the best use of "J" model in fuzzy sets and Dempster-Shafer-Weight-of-Evidence which carries out combination of factors affecting soil salinization, in order to estimate the reliability of soil salinization, and expert knowledge was used to evaluate these evidences affecting soil salinization. The probability surface map of soil potential salinization of Yucheng City was obtained. The results show that the distribution of salinization land has not only spatial variability, but also consistency, that is to say, at the premise of the same topography and certain distance, it has large probability of the area where salinization is likely to occur. Groundwater mineralization and groundwater depth are the two key factors to soil potential salinization.