【摘要】：以荒漠草原常見的耕作區(qū)、圍封區(qū)、放牧區(qū)及旅游區(qū)4種土地利用類型表層土壤為研究對象,利用激光衍射技術分析了0~2 cm表層土壤粒度組成,計算并分析平均粒徑、標準偏差、偏度、峰態(tài)及分形維數(shù)等粒度參數(shù),探討風蝕顆粒范圍。結果表明:1希拉穆仁荒漠草原耕作區(qū)、圍封區(qū)、放牧區(qū)及旅游區(qū)4種土地利用類型土壤粒度組成均表現(xiàn)為以砂粒和粉粒為主,黏粒含量較低,樣地平均粒徑數(shù)值依次變小,分選性逐漸變好,峰態(tài)平緩,分形維數(shù)數(shù)值逐漸減小,土壤顆粒組成依次粗化;偏度分別為負偏、近于對稱、正偏和偏正偏,彼此差異明顯,偏度可作為有效的粒度參數(shù)指標。2通過分析粒度分布頻率曲線和土壤粒度累積頻率間平均距離,顯示研究區(qū)粒徑為134μm和454μm附近顆粒為近自然狀態(tài)下的易風蝕顆粒。各粒度參數(shù)及分維值均顯示放牧和旅游加劇希拉穆仁草原表層土壤風蝕,土壤粒度分布范圍變寬,整體向粗�；较虬l(fā)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.
【作者單位】： 內蒙古農業(yè)大學沙漠治理學院;內蒙古自治區(qū)錫林郭勒盟鑲黃旗國營苗圃;
【分類號】：S152.3

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