干旱区绿洲盐渍土粒径分布单重分形和多重分形特征

doi:10.13866/j.azr.2019.02.06

摘要/Abstract

摘要： 为定量描述干旱区绿洲盐渍化土壤的粒径分布特征,对38个土壤样品的粒径分布与含盐量进行测定,并基于分形理论定量表征了研究区盐渍土和非盐渍土的土壤粒径分布特征。结果表明:粉粒的体积分数占主导地位,砂粒和黏粒次之;土壤含盐量与粉粒和黏粒体积分数呈正相关,而与黏粒呈负相关;单重分形维数D值介于1.990~2.349,且与土壤黏粒和粉粒含量成正比,相关系数分别为0.81和0.64(P<0.01),与砂粒含量呈反比,相关系数为-0.67(P<0.01);土壤粒径分布具有多重分形特征,盐渍土(含盐量≥3 g·kg^-1)的粒径分布较非盐渍土(<3 g·kg^-1)更广,非均匀性更强;土壤含盐量与多重分形信息维D₁和D₁/D₀呈极显著负相关,相关系数分别为-0.265(P<0.01)和-0.283(P<0.01),与多重分形谱谱宽呈现极显著正相关,相关系数为0.206(P<0.01),而与D、容量维D₀和多重分形谱性状特性均没有显著相关性。

关键词: 渭干河-库车河绿洲, 盐渍土, 土壤粒径, 单重分形, 多重分形, 干旱区

Abstract: In order to explore the relationship between salinization characters and soil particle size distribution (PSD) of soil in arid oasis, total 38 soil samples were collected from the Weigan-Kuqa River delta oasis in Xinjiang Uygur Autonomous Region in April 2016. And the characteristics of soil PSD of saline soil and non-saline soil in the study area were quantitatively based on the fractal theory. The results showed that the volumetric percentages of silt particles were dominated, followed by sand and clay particles. The volumetric percentages of silt and clay were positively correlated with soil salt content, while the volumetric percentage of sand was negatively correlated with soil salt content. The D value of the fractional dimension was ranged from 1.990 to 2.349, and the correlation coefficients between it and the volumetric percentages of clay and silt particles was 0.81 and 0.64, respectively, which passed the significance test at level of 0.01. However, the correlation between D value and the volumetric percentage of sand particles was significantly negative with the correlation coefficient of -0.67 (P<0.01). The soil PSD had the multifractal characteristics, PSD range of the saline soil (salt content ≥3 g·kg^-1) was wider than that of the non-saline soil (salt content <3 g·kg^-1), and which was more heterogeneous. Soil salt content was significantly negative correlation with the multifractal parameters D₁ (the entropy dimension) and D₁/D₀ with the correlation coefficients of -0.265 (P<0.01) and -0.283 (P<0.01) respectively. The significantly positive correlation could be detected between soil salt content and Δa(the width of multifractal spectra) with a correlation coefficient of 0.206 (P<0.01). However, soil salt content had no significant correlation with D, D₀ (capacity dimension) and Δf.

Key words: Weigan-Kuqa River Oasis, saline soil, soil particle size, fractal, multifractal, arid region

张桉赫, 丁建丽, 王敬哲, 穆艾塔尔·赛地, 李艳菊. 干旱区绿洲盐渍土粒径分布单重分形和多重分形特征[J]. 干旱区研究, 2019, 36(2): 314-322.

ZHANG An-he, DING Jian-li, WANG Jing-zhe, MUATTAR Saydi, LI Yan-ju. Fractal and Multifractal Analysis on Saline Soil Particle Size Distribution in Arid Oasis[J]. Arid Zone Research, 2019, 36(2): 314-322.

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