中文摘要：

从湖泊水文要素变化出发,基于湖泊和流域的关系,利用相关分析方法,对近50 a来岱海水位、矿化度等水文要素变化序列进行了分析.并对变化原因进行了探讨,结果表明：相对封闭及较小尺度的流域面积等自身特性,决定了其水资源系统自我调节能力的脆弱性;而近年来流域上的人类活动,增大了降水径流滞留时间和蒸发作用,蒸发的水汽随环流流出流域,最终导致汇入流域的持水量和汇入湖泊的水量不断减少,矿化度在湖水量不断减少的情况下浓缩升高.最后就变化趋势及影响进行了讨论.

英文摘要：

The Daihai Lake basin （40°12＇-40°18＇N, 112°17＇- 112°54＇E） is located in Liangcheng County, a region where the boundary between Ulanqab League of Inner Mongolia Autonomous Region and Shanxi Province meets, is a small closed continental basin, its catchment area is 2312 km^2, and the landforms are dominated by hills and plains. The drainage basin is in a transitional zone between semiarid and semi-humid regions, where the annual temperature, precipitation and evaporation are 5.1℃, 350 -450 mm and 1 200 mm respectively, and the annual air pressure is 875.2 hPa. The stream system of the Daihai Lake includes the lake itself and 22 rivers, in which most of them are ephemeral streams, the elevation of multi-year average water level of the lake is 1 224.10 m a. s. 1. , the average water depth is 7 m, the multi-year average water area is 133.46 km^2, and the storage capacity of the lake is 1.12 × 10^9 m^3. Based on the relationship between the Daihai Lake and its drainage basin, in this paper, the temporal series of the change of hydrological factors, such as the water level and mineralization of Daihai Lake since recent 50 years, are analyzed using correlation analysis, and the causes resulting in such change are researched. The results show that the self-regulation capability of the lake is weak because of the effects of geographical and hydrological factors in the systems of water resources in the drainage basin; the water carrying capacity of the drainage basin and the inflow of the lake are continuously reduced due to the increase of human activities and evaporation, thus the mineralization of the lake is increased. Moreover, the change trend of water level and mineralization of the Daihai Lake is also discussed.