The Changes of Soil Physical Properties in Arctic-alpine Grassland Desertification Process in Northwest Sichuan -Taking Litang County for Example
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摘要: 以理塘县高寒草地为研究对象,采用空间序列代替时间序列的研究方法对该区不同沙化类型草地的土壤物理性质变化进行了分析。结果表明:在高寒草地沙化进程中存在着土壤砂粒含量不断增加,土壤容重不同程度增加,而土壤总孔隙度和毛管孔隙度相应减小的变化趋势;沙化初始阶段土壤容重、孔隙度变化幅度均大于沙化进展阶段,从沙化防治理的角度看,川西北高寒草地沙化初始阶段是沙化防治的关键阶段;总的来看,土壤上层(0~20 cm)容重要小于下层(20 cm~40 cm),而土壤总孔隙度和毛管孔隙度则是上层大于下层;天然草地平均砂粒含量较高,表明川西北高寒草地具备潜在的沙化物质条件。Abstract: In this paper, taking arctic-alpine grassland in Litang County as the research object, the method of the spatial sequence instead of the tempoal sequence was used to analyze the changes of different desertified grassland types in soil physical properties in the area. Analysis results showed the total porosity and capillary porosity of soil had a decreasing trend in the desertification process, and the soil sand content increased continuously and the soil bulk density increased to different degrees. The intial stage of the arcticalpine grassland desertification in the northwestern Sichuan was the critical stage of desertification prevention and control because the variations of soil bulk density and porosity in the early desertification stage were greater than those in the desertification progress stage. The soil bulk density of the upper layer of the soil (0~20 cm deep) was less than that of the lower layer (20 cm~40 cm deep), but the total and capillary porosities of the upper layer of the soil were greater than those of the lower layer; Besides, the average sand content in natural grassland was relatively high, which indicated that the arctic-alpine grassland in northwest Sichuan had potential desertification material conditions.
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