水分胁迫是一种常见的植被胁迫状态, 能够减小细胞水势, 引起气孔关闭, 破坏光合进程。 叶绿素荧光是植物光合作用的探针, 可以很好的反应植物生理特征, 能够快速、 灵敏、 无损伤和深层次监测水分胁迫状态。 由于叶绿素荧光的影响因素较多, 使得水分胁迫与叶绿素荧光的关系比较复杂。 从光合作用角度阐述了叶绿素荧光的产生原理, 分析了叶绿素、 叶片结构、 冠层结构和环境因子等对叶绿素荧光的影响, 总结了叶绿素荧光在水分胁迫监测中的应用; 针对叶绿素荧光复杂的生理基础、 影响因素及其在水分胁迫监测中的研究进展, 提出了一些科学问题和未来的研究方向, 为叶绿素荧光的进一步深入研究提供参考, 为叶绿素荧光遥感的进一步应用提供理论支持, 为陆地生态系统的准确评估提供借鉴。

Water stress is one of most common stress factors for vegetation. It can reduce cell water potential and stomatal conductance, thus may threaten the process of photosynthesis. Moreover, it can be noninvasively detected by using chlorophyll fluorescence, which is considered as the proxy of photosynthesis due to its sensitive to physiological change. However, chlorophyll fluorescence can be easily influenced by various factors, such as water stress, temperature, chlorophyll content, leaf and canopy structure. As a consequence, the relationship between chlorophyll fluorescence and water stress is significantly complicated. Thus, the study is focused on the rationale of chlorophyll fluorescence and its application in detecting water stress. Firstly, the origin of chlorophyll fluorescence in the view of photosynthesis was briefly introduced. Then, influence factors including chlorophyll content, leaf and canopy structure, ambient factors that affect chlorophyll fluorescence were analyzed. Furthermore, we summarized the application of chlorophyll fluorescence in detecting water stress. Finally, based on the above clarification, we proposed a new strategy of the application of chlorophyll fluorescence in water stress detecting.