土壤2016，Vol.48Issue(4)：803-812,10.DOI:10.13758/j.cnki.tr.2016.04.026
希拉穆仁荒漠草原风蚀地表颗粒粒度特征
Particle Size Characteristics of Wind Erosion Surface Soil in the Desert Steppe
摘要
Abstract
The topsoil samples of 0 – 2 cm were collected from farming land, fenced grassland, grazing grassland and tourist area in Xilamuren desert steppe and used to investigate soil particle size characteristics. First,the soil particle size distributions were identified by laser diffraction technique. Second, the particle size parameters of average particle size, standard deviation, skewness, kurtosis, and fractal dimension were subsequently calculated. And then, the erosion particle range was discussed. The results indicated that: 1) the topsoil particles in desert steppe were mainly composed of sand and silt, while the clay content was extremely low. Soil particle size followed the order: farming land < fenced grassland < grazing grassland < tourist area. Soil particle size distributions were all in poor sorting. The kurtosis was medium, wide flat, wide flat and medium for farming land, fenced grassland, grazing grassland and tourist area, respectively. The fractal dimensions were 2.39, 2.26, 2.20 and 1.88 for these land using types. Correspondingly, the skewness of these land using types was negative, nearly symmetrical, positive skewness and partial positive, respectively. The skewness can be used as an effective particle size parameter. 2) Based on the analyses of frequency curves of soil particle size and the average distance, it was found that when soil particles were about 134μm and 454μm, which are the easiest to be erode by wind under near nature conditions. The particle size parameters and fractal dimension showed that the grazing and tourism accelerated wind erosion of topsoil in this region. Soil particle distribution was becoming wide, and soil coarse particles increased gradually.关键词
粒度特征/风蚀/荒漠草原Key words
Particle size characteristics/Wind erosion/Desert steppe分类
农业科技引用本文复制引用
丁延龙,高永,蒙仲举,娜仁格日勒,黄昕,孙晓瑞,吴昊,党晓宏,王猛..希拉穆仁荒漠草原风蚀地表颗粒粒度特征[J].土壤,2016,48(4):803-812,10.基金项目
中科院西部之光项目和内蒙古农业大学优秀青年科学基金项目(2014XYQ-8)资助。 （2014XYQ-8）
