基于不同插值方法的于田绿洲盐渍化土壤特性空间变异分析

发布时间：2018-08-03 19:45

【摘要】：以于田绿洲为例,基于地统计学的反距离加权法(IDW)、径向基函数法(RBF)、普通克里金法(OK)及局部多项式法(LPI)等4种不同插值方法,经过交叉验证对比确定了适用的方法进行插值,揭示了盐渍化土壤含盐量、电导率、PH值和含水量的空间变异特征。研究表明:(1)于田绿洲含盐量均值为9.29 g kg-1属重盐土类型,同时土壤电导率、含盐量、含水量和pH分别表现为强、中等、弱空间变异性;(2)土壤特性的结构性因子C/(C0+C)均大于75%,表现出空间自相关较强,是结构性因素主导作用的影响;(3)在电导率和含盐量的空间变异分析采用IDW法较为适合,对pH值的空间插值采用OK法精度最高,含水量则除了LPI法,其他三种方法都可以任意选用;(4)土壤含盐量和电导率空间分布表现出北高南低的分异规律,绿洲外围高于绿洲内部,pH值呈现从东部至西部递减的趋势,易受随机性因素的影响,含水量则出现南北方向明显的差异,研究区中、东部绿洲内高值存在。通过不同插值方法对于田绿洲盐渍化土壤特性的空间异质性研究,揭示了土壤特性空间变异特征及空间分布规律,可为解决土壤盐渍化问题提供基础参考。
[Abstract]:Taking Yutian oasis as an example, four different interpolation methods, such as inverse distance weighting method, (IDW), radial basis function method, (RBF), general Kriging method, (OK) method and local polynomial method (LPI), which are based on geostatistics, are used to carry out interpolation. The spatial variation characteristics of salinization soil salinity, electrical conductivity and water content were revealed. The results showed that: (1) the average salt content of Yutian oasis was 9.29g kg-1, and the conductivity, salt content, water content and pH value of the soil were strong and moderate, respectively. (2) the structural factors C / (C0C) of soil characteristics are all larger than 75, showing a strong spatial autocorrelation, which is the dominant effect of structural factors. (3) the IDW method is suitable for the spatial variation analysis of conductivity and salt content. For the spatial interpolation of pH value, OK method is the most accurate, except LPI method, the other three methods can be chosen arbitrarily. (4) the spatial distribution of soil salinity and conductivity shows the law of differentiation between north and south. The pH value of the oasis is higher than that of the inner oasis. The pH value of the oasis decreases from the east to the west, which is easily influenced by random factors, and the water content is obviously different in the north and south directions. In the study area, the high value in the eastern oasis exists. The spatial heterogeneity of soil characteristics of soil salinization in field oasis was studied by different interpolation methods, and the spatial variation characteristics and spatial distribution of soil characteristics were revealed, which can provide a basic reference for solving the problem of soil salinization.
【作者单位】：新疆大学资源与环境科学学院;新疆大学绿洲生态教育部重点实验室;
【基金】：国家自然科学基金重点基金联合项目(U1138303);国家自然科学基金(41561089)和(41361016)资助
【分类号】：S156.4

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