包气带剖面中古水文-气候信息的初步研究

A Tentative Discussion on Paleohydrological and Paleoclimatical Information from Unsaturated Zone Profile

包气带作为联系地表各层圈相互作用的敏感带 ,具有特殊的记忆功能 ,是最有可能的古水文 气候变化记录档案。研究中以 2个包气带剖面为研究对象 ,通过对剖面上土壤水的Cl-含量变化进行研究 ,利用Cl-质量平衡方法探讨识别其所代表的古水文 气候记录的方法 ,恢复研究区的古水文补给历史。研究结果表明 ,研究区 3 0 0a以来的古水文 气候状况有过 3次干 /湿变化旋回 ,并且反映在地下水补给速率的变化上。

The unsaturated zone, as a sensitive zone relating to various processes at the surface of the earth, has a unique recording function and hence serves as potential archives of the past hydrological or climatic changes. From two unsaturated zone profiles in Shijiazhuang of North China Plain, the authors revealed the implications of paleohydrology and paleoclimate by analyzing the chloride profiles and estimating the recharge rate with chloride mass balance method. Meanwhile, the recharge history of this area was reconstructed. The results suggest that there seem to have had three dry/wet hydrological cycles over the last 300 years. Furthermore, the changes of recharge rate have also reflected these hydrological fluctuations.