降雨对流动沙丘水分动态变化特征的影响  

INFLUENCE OF RAINFALL ON SOIL WATER DYNAMIC IN MOVING SANDDUNE

作　　者：闫德仁[1] 黄海广[1] 胡小龙[1] 袁立敏[1] 

机构地区：[1]内蒙古林业科学研究院,呼和浩特010010

出　　处：《内蒙古农业大学学报（自然科学版）》2016年第1期47-53,共7页Journal of Inner Mongolia Agricultural University(Natural Science Edition)

基　　金：国家"十二五"科技支撑课题(2012BAD16B0204);多伦生态站项目资助

摘　　要：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。Water dynamic condition in moving sanddune was the basis of reasonable configuration sandfixing vegetation. Rainfall and it infiltration depth were main influence factor on soil water dynamic in moving sanddune. The watchdog soil moisture automatic moni- toring system were used to positioning timing record soil volume water content for 0 - 120cm deep in moving sanddune of Duolun county the south margin of the Hunshandake sand, and the same time the CR - 1000 type automatic weather stations was installation to recorded the rainfall. The results showed that the water content change of difference soil layers in moving sandsune were influenced by many factors,which were the precipitation,cumulative rainfall and rainfall infiltration effection,during June 21 to October 31. Soil wa- ter dynamic for 0 -40cm deep in moving sanddune was sensitized to response for daily rainfall. When daily rainfall was 50mm, or in- fluenced by infiltration effect of cumulative rainfall, the soil water content were increased in 80cm or 120cm soil layer, respectively. When daily rainfall was less 20mm,the rain wetting depth was less 20cm soil layer. When daily rainfall was 30mm,it was 40cm - 80cm soil layer. When daily rainfall was 49.27mm,it was 120cm soil layer. This results showed that precipitation had replenishment effect for increasing soil water content in moving sanddune, and but the replenishment supply ability was limited for increasing soil water content of 80cm or deeper soil layer in moving sanddune.

关 键 词：浑善达克沙地 流动沙丘 降雨量 水分动态 降雨湿润深度. 

分 类 号：S152.7[农业科学—土壤学]