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土壤粒径分布及空间变化是土壤重要的物理特性之一,对土壤水分和溶质运移、土壤侵蚀等有重要意义.研究选用新疆膜下滴灌试验田的563个土壤样品,利用激光衍射粒径分析仪分析土壤粒径分布,采用质地三角分类、分形和多重分形对土壤粒径分布进行研究,探讨土壤粒径特征及与水盐含量的关系.研究区土壤颗粒中粘粒含量偏低,平均值为1.52%,砂粒含量最大,粒径分布呈现复杂的单、双峰分布特征;土壤粒径分布的分形和多重分形与土壤颗粒含量的标准差及最大值有良好的相关性,可以较好地反映土壤粒径分布曲线.膜下滴灌对表层土壤盐分空间分布有较大影响,随着深度增加影响减弱;土壤质地与稳定状态下土壤水盐含量关系密切,特别是对土壤表层盐分聚集和深层土壤水分分布有显著影响.
Soil particle size distribution and spatial variation are one of the important physical characteristics of soils, and are of great significance to soil moisture and solute transport and soil erosion. A total of 563 soil samples from Xinjiang sub-layer drip irrigation experiment field were selected and analyzed by laser diffraction particle size analysis Instrument to analyze the distribution of soil particle size, the distribution of soil particle size was studied by texture triangulation, fractal and multifractal, and the relationship between the characteristics of soil particle size and the content of water and salt was discussed.The content of clay in soil particle was low, Was 1.52%, the content of sand was the largest, and the distribution of particle size showed complicated single and bimodal distribution. The fractal and multifractal of soil particle size distribution had good correlation with the standard deviation and the maximum of soil particle content, which could be better Which reflects the distribution curve of soil particle size.Drip drip irrigation has a great influence on the spatial distribution of soil salinity, with the increase of depth, the influence is weakened. Soil texture is closely related to the soil water and salt content under steady state, especially on the surface soil salt accumulation and deep Soil moisture distribution has a significant effect.