关于蒸腾作用指标的探讨

Discussion about the measurements of transpiration

在很多植物生理学教材中,都有3个度量蒸腾作用的指标,分别是蒸腾速率、蒸腾比率和蒸腾系数。蒸腾速率概念明确、容易理解,但蒸腾比率和蒸腾系数这两个指标在实际教学中生理意义不明确,学生不容易理解,容易产生歧义。本文中,我们讨论了蒸腾比率和蒸腾系数存在的问题,在此基础上建议停止使用这两个术语,而使用蒸腾效率和需水量。

Three terms, i.e., transpiration rate, transpiration ratio, and transpiration coefficient, are widely used to measure transpiration in many textbooks of plant physiology. The concept of transpiration rate is explicit and easy to understand. However, the concepts of transpiration ratio and transpiration coefficient are ambiguous and difficult to understand. Here, we discussed the problems of these two terms, and suggested to stop using them in the future. Instead, we recommended using transpiration efficiency or water-use efficiency, and water requirement.