青海湖湖东克土沙区固定沙丘土壤水分动态变化的初步研究

本文通过土壤水分观测，结合降水记录及地表沉积物粒度分析，对青海湖湖东克土沙区 固定沙丘不同地貌部位土壤水分的时空变化规律进行了初步研究。结果表明：0~100 cm 深度内， 丘间地的土壤含水量最高，丘顶与背风坡次之，迎风坡最低。迎风坡丘间地与迎风坡脚受地下水 的影响，分别以40 cm 和100 cm 为界，土壤含水量在界限以上变化不大，界限以下随着深度增 加而迅速增大。其它地貌部位土壤水分来源主要是大气降水，0~20 cm 土壤含水量都随土壤深度 增加而增加，20 cm 以下则表现出不同的变化规律。

A preliminary study on dynamics of soil water content of the fixed dune in Ketu sand land on the east of Qinghai Lake

By observing soil water content, integrating rai nfall monitoring and surface sediments particle size analysis, we preliminarily studied the dynamics of soil water content at different geomorphological locations of the fixed dune in Ketu sand land on the east of Qinghai Lake. The results showed that from 0~100 cm the soil water content of the interdunal areas was the highest, dune top and leeward slop was the second, and windward slop was the lowest. On the vertical profi le, under the infl uence of groundwater, both the dune slack next to the windward slope and the feet of windward slope had critical depth, separately, 40 cm and 100 cm. Above the critical depth, the soil water content changed little, whereas below it the soil water content increased rapidly with depth. While the soil water content of other geomorphological locations, whose major source was precipitation, increased with depth during 0~20 cm, while the changes were complicated below 20 cm.