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选择长江源区五道梁为研究区域,以典型发育的热融湖塘为研究对象,运用激光粒度仪测得土壤粒径分布,并结合分形模型对高寒草甸土壤颗粒分布与水文过程进行研究。结果表明:热融湖塘的形成加快了长江源区高寒草甸土壤沙质化的进程,随着其影响程度的加剧,黏粒、粉粒含量逐渐减小,砂粒含量逐渐增大,同时土壤颗粒体积分形维数也逐渐减小,并与黏粒、粉粒呈显著正相关,与砂粒含量呈显著负相关,土壤颗粒体积分形维数可代替土壤不同粒径颗粒组成表征土壤沙质化的进程。此外,在热融湖塘影响下的土壤水文过程的改变,是加快土壤沙质化的重要因素之一。
Wudaoliang of the Yangtze River source region was selected as the study area, and the typical hot-melt lakes and ponds were selected as the research object. The particle size distribution of the soil was measured by laser particle sizer and the soil particle distribution and hydrological process in the alpine meadow were studied with the fractal model . The results showed that the formation of hot-melt lakes and ponds accelerated the process of sandyification of alpine meadow in the source region of the Yangtze River. With the increase of the degree of influence, the content of clay and silt gradually decreased and the content of sand increased gradually. The volume fractal dimension of particles also decreased gradually, and was positively correlated with clay and silt content, but negatively correlated with the sand content. Soil volume fractal dimension could represent the sandy soil instead of different particle size of soil process. In addition, the change of soil hydrological processes under the influence of hot-melt lakes and ponds is one of the important factors to speed up soil sandsification.