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流动沙丘水分动态状况是合理进行固沙植被配置的基础,而降雨及其入渗特征又是影响流动沙丘水分动态的重要因素。采用Watchdog土壤水分自动监测系统和CR-1000型自动气象站自动采集的降雨数据,同步监测了浑善达克沙地南缘多伦县流动沙丘0~120cm土层土壤体积含水量的动态变化。结果表明:6月21日至10月31日间,流动沙丘不同土层水分含量变化受降雨量、累计降雨量以及降雨入渗效应等多因素的影响。其中,流动沙丘40cm以上土层水分动态对日降雨量的响应敏感,日降雨50mm或受累计降雨入渗效应的影响能够提高80cm和120cm土层水分含量。降雨量20mm时降雨湿润深度低于20cm土层、30mm时湿润深度为40~80cm土层、49.27mm时湿润深度可达120cm土层,说明降雨对流动沙丘水分状况有补给作用,但是对80cm以下土层水分状况的补给能力有限。
The dynamic state of water flow in sand dune is the basis for the reasonable allocation of sand-fixing vegetation. Rainfall and its infiltration characteristics are also important factors affecting the water dynamic of sand dune. Using Watchdog soil moisture automatic monitoring system and CR-1000 automatic weather station to collect rainfall data, the dynamic changes of soil water content in 0 ~ 120cm soil layer of mobile dunes in the southern part of Hunshandake Sandy Land were monitored simultaneously. The results show that: from June 21 to October 31, the change of water content in different layers of mobile sand dunes is affected by many factors such as rainfall, cumulative rainfall and rainfall infiltration effects. Among them, the dynamic change of soil moisture above 40cm in mobile sand dunes is sensitive to the daily rainfall. The daily rainfall of 50mm or the effect of cumulative rainfall infiltration can increase the moisture content of 80cm and 120cm soil layers. When the rainfall is 20mm, the depth of rainfall is less than 20cm, the depth of wetting is 40 ~ 80cm at 30mm, and the depth of wetting is up to 120cm at 49.27mm, which indicates that rainfall has the effect of replenishing the moisture of flowing sand dunes. However, Soil water supply capacity is limited.