浑善达克沙地地下水位动态变化及其影响

Dynamic Change of Groundwater Level and Its Influence in Hunshandake Sandy Land

降雨和地下水位等动态变化对固沙植被生长及其稳定性具有重要影响。采用定位定时自动观测方法,研究了浑善达克沙地多伦生态站风沙土地下水位变化及其对降雨特征的响应。结果表明,沙地地下水位埋深年平均在2.95~3.00 m,其变化幅度小于10 cm。在植物生长季地下水位处于最低期,其他时间基本属于地下水位回升恢复期。持续累计降雨大于40 mm时对地下水位变化有影响,当降雨量达56.64 mm时,地下水位埋深明显回升。年地下水位埋深呈现波浪式变化趋势,且降雨对沙地地下水位的补给具有滞后效应,并与持续累计降雨量大小有关。

Dynamic change of rainfall and groundwater level has an important impact on the growth and stability of sand-fixing vegetation.By use of the positioning and timing automatic observation method,the changes of groundwa-ter level for the aeolian soil and its response to rainfall characteristics were studied in Duolun Ecological Station of Hunshandake Sandy Land.The results showed that the annual average groundwater depth in Hunshandake Sandy Land was 2.95-3.00 m,with the variation range less than 10 cm.The groundwater level was at the lowest period in the growing season of plant,and it was basically the recovery period in other time.The changes of groundwater level had been reflected when the continuous accumulated rainfall was more than 40 mm,and the groundwater depth raised obviously when the rainfall reached 56.64 mm.The annual groundwater depth showed a waving trend,the rainfall had a lagging effect on the recharge of groundwater level in sandy land,and it was related to the continuous accumulated rainfall.