希拉穆仁荒漠草原风蚀地表颗粒粒度特征
发布时间：2018-08-04 17:54
【摘要】：以荒漠草原常见的耕作区、围封区、放牧区及旅游区4种土地利用类型表层土壤为研究对象,利用激光衍射技术分析了0~2 cm表层土壤粒度组成,计算并分析平均粒径、标准偏差、偏度、峰态及分形维数等粒度参数,探讨风蚀颗粒范围。结果表明:1希拉穆仁荒漠草原耕作区、围封区、放牧区及旅游区4种土地利用类型土壤粒度组成均表现为以砂粒和粉粒为主,黏粒含量较低,样地平均粒径数值依次变小,分选性逐渐变好,峰态平缓,分形维数数值逐渐减小,土壤颗粒组成依次粗化;偏度分别为负偏、近于对称、正偏和偏正偏,彼此差异明显,偏度可作为有效的粒度参数指标。2通过分析粒度分布频率曲线和土壤粒度累积频率间平均距离,显示研究区粒径为134μm和454μm附近颗粒为近自然状态下的易风蚀颗粒。各粒度参数及分维值均显示放牧和旅游加剧希拉穆仁草原表层土壤风蚀,土壤粒度分布范围变宽,整体向粗粒化方向发展。
[Abstract]:The surface soil of four types of land use in desert steppe, including cultivated area, enclosed area, pastoral area and tourist area, was studied. The particle size composition of 0 ~ 2 cm surface soil was analyzed by laser diffraction technique, and the average particle size was calculated and analyzed. Standard deviation, peak state and fractal dimension were used to study the range of wind erosion particles. The results showed that the soil granularity composition of the four land use types in Xilamuren desert steppe was mainly composed of sand and silt, and the clay content was lower, and the average particle size of the sample became smaller in turn. The sorting property became better gradually, the peak state was flat, the fractal dimension value gradually decreased, the soil particle composition was coarser in turn, the deviation degree was negative deviation, near symmetry, positive deviation and positive deviation, the difference between them was obvious. By analyzing the average distance between the particle size distribution frequency curve and the soil particle size accumulation frequency, the results showed that the particle sizes around 134 渭 m and 454 渭 m in the study area were near natural wind-prone particles. The grain-size parameters and fractal dimension values showed that grazing and tourism aggravated wind erosion on the surface soil of Xilamuren grassland, and the distribution of soil granularity became wider and the whole developed towards coarse granulation.
【作者单位】： 内蒙古农业大学沙漠治理学院;内蒙古自治区锡林郭勒盟镶黄旗国营苗圃;
【分类号】：S152.3
本文编号：2164649
[Abstract]:The surface soil of four types of land use in desert steppe, including cultivated area, enclosed area, pastoral area and tourist area, was studied. The particle size composition of 0 ~ 2 cm surface soil was analyzed by laser diffraction technique, and the average particle size was calculated and analyzed. Standard deviation, peak state and fractal dimension were used to study the range of wind erosion particles. The results showed that the soil granularity composition of the four land use types in Xilamuren desert steppe was mainly composed of sand and silt, and the clay content was lower, and the average particle size of the sample became smaller in turn. The sorting property became better gradually, the peak state was flat, the fractal dimension value gradually decreased, the soil particle composition was coarser in turn, the deviation degree was negative deviation, near symmetry, positive deviation and positive deviation, the difference between them was obvious. By analyzing the average distance between the particle size distribution frequency curve and the soil particle size accumulation frequency, the results showed that the particle sizes around 134 渭 m and 454 渭 m in the study area were near natural wind-prone particles. The grain-size parameters and fractal dimension values showed that grazing and tourism aggravated wind erosion on the surface soil of Xilamuren grassland, and the distribution of soil granularity became wider and the whole developed towards coarse granulation.
【作者单位】： 内蒙古农业大学沙漠治理学院;内蒙古自治区锡林郭勒盟镶黄旗国营苗圃;
【分类号】：S152.3
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