环境示踪剂（3H、Cl）在干旱半干旱区地下水补给研究中的应用

地下水补给资源估算是地下水资源可持续开发利用的重要依据，传统地下水资源评价工作往往是采取水均衡法或达西定律等评价地下水补给资源，很少采用环境示踪剂方法。环境示踪剂在地下水补给研究中具有重要价值，特别是在干旱半干旱地区是一种非常简单可靠的评价方法。本文介绍了两种常见的环境示踪剂（3H、Cl）方法氚峰法和氯质量平衡法的基本原理及其在地下水补给研究中的主要应用，其中氯质量平衡法不仅可以估算地下水的补给量，而且可以研究植被覆盖变化对地下水补给影响和示踪地下水补给历史及气候变化。

Application of Environmental Tracers (3H, Cl) for Groundwater Recharge Research in Arid and Semi-arid Regions

The estimation of groundwater recharge resources is an important basis for sustainable development and utilization of groundwater resources. Traditional groundwater resources evaluation work often uses water balance method or Darcy''s law to evaluate groundwater recharge resources, and rarely uses environmental tracer methods. Environmental tracers have important value in groundwater recharge research, especially in arid and semi-arid areas, which is a very simple and reliable evaluation method. In this paper, basic principles of two common environmental tracer (3H, Cl) methods have been introduced, they are tritium peak method and chlorine mass balance method, and their main applications in groundwater recharge research have been introduced as well. The chlorine mass balance method can not only estimate the amount of groundwater recharge, but also study the impact of vegetation cover changes on groundwater recharge and trace the groundwater recharge history and climate change.