长武和米脂刺槐生长对干旱胁迫的响应数据集（2021-2022年）

蒸腾是树木水分利用的主要途径，同时也是土壤-植物-大气连续系统（SPAC）水分传输过程的关键环节，其动态变化不仅受到外部环境因素的影响，同时还受到植物自身气孔导度和水力导度等内部因素的调节。因此，研究不同环境条件下刺槐水分利用的特征及调节机制差异，有助于正确认识林地植被需水规律，从而对黄土高原不同气候区的植被恢复提供理论指导。结果表明，土壤干旱条件下，刺槐人工林的归一化蒸腾量和冠层气孔导度及其对气候的敏感性显著低于非干旱条件下，且半湿润区刺槐的蒸腾对气候变化更敏感。半湿润区刺槐气孔对蒸腾的调节能力较强，而半干旱区刺槐的气孔调节能力则相对较弱。刺槐在干旱条件下更易通过降低叶水势和整树水力导度诱发叶片气孔关闭，进而降低冠层导度以调节水分的散失。

Transpiration represents the primary pathway for tree water utilization, and constitutes a critical linkage in the water transport processes within the Soil-Plant-Atmosphere Continuum (SPAC). Its dynamic variations are governed by both external environmental factors and internal regulatory factors such as plant stomatal conductance and hydraulic conductivity. Therefore, investigating the differences in water use characteristics and regulatory mechanisms of Robinia pseudoacacia under various environmental conditions can facilitate a better understanding of the water requirement patterns of forest vegetation, thereby providing theoretical guidance for vegetation restoration efforts in different climatic zones of the Loess Plateau. The findings indicate that under soil drought conditions, the normalized transpiration, canopy stomatal conductance and their climatic sensitivity of artificial Robinia pseudoacacia plantations are significantly lower than those under non-drought conditions. Additionally, the transpiration of Robinia pseudoacacia in semi-humid regions exhibits greater sensitivity to climate change compared to that in semi-arid regions. Robinia pseudoacacia in semi-humid regions possesses a stronger capacity to regulate transpiration via stomatal movement, whereas the stomatal regulatory ability of Robinia pseudoacacia in semi-arid regions is relatively weaker. Under drought conditions, Robinia pseudoacacia is more prone to inducing leaf stomatal closure by reducing leaf water potential and whole-tree hydraulic conductivity, consequently lowering canopy conductance to modulate water loss.