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根据对青海湖北刚察县吉尔孟乡草地土壤含水量测定和粒度分析,研究了土壤水分变化等问题。研究区土层上部粒度成分以粗粉砂为主,下部以细砂为主。2009年该区草地土壤重力水分布深度达到了60 cm左右。土壤上部含水量丰富,下部水分严重不足。在土层约80 cm深度之下出现了中等干层和部分严重干层。该区土壤干层的发育阻隔了大气降水向地下深处的入渗,属于异常水分循环类型。该区土壤水分处于负平衡状态,指示当地的降水量并不能充分满足草原植被生长的需要。吉尔孟乡土壤蓄水量较少,易于发生生态环境的退化。
According to the determination and particle size analysis of grassland soil moisture in Ji’er Meng Township, Gangcha County, Qinghai Province, the issues such as soil moisture change were studied. The upper part of the soil layer in the study area mainly consists of coarse silt and the lower part is mainly fine sand. In 2009 the grassland soil gravity water distribution depth reached about 60 cm. The upper part of the soil is rich in water and the water in the lower part is seriously deficient. Below the soil depth of about 80 cm there is a moderate dry layer and some serious dry layers. The development of dry layer of soil in this area obstructs the infiltration of atmospheric precipitation into the deep underground and belongs to the type of abnormal water cycle. Soil moisture in this area is in a negative balance, indicating that the local precipitation does not fully meet the needs of grassland vegetation growth. Ji’er Meng Township soil less water storage, prone to degradation of the ecological environment.