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中国沙漠  2014 

长江源多年冻土区热融湖塘的形成对土壤沙化过程的影响

DOI: 10.7522/j.issn.1000-694X.2013.00376

Keywords: 热融湖塘,长江源区,颗粒分形维数,沙化过程

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Abstract:

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。

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