高温干旱复合胁迫对刺槐幼苗生理生化性能的影响

干旱与温度升高是未来全球气候变化情景的2种主要表现形式，对植物生长与分布影响显著。通过不同温度和水分梯度控制，模拟高温与干旱复合胁迫对刺槐幼苗光合性能指标与抗氧化酶活性的影响，结果表明：干旱抑制刺槐幼苗生长，而短期高温则对其生长具有一定促进作用；株高、叶片数量、光合性能、POD、CAT活性受温度、水分、温度×水分因素影响显著；高温干旱不仅使刺槐幼苗抗氧化酶活性升高，同时促进刺槐幼苗体内氮磷积累，但过度高温干旱抑制磷积累。

The Combined Stress of Elevated Temperature and Drought on the Physiological and Biochemical Characteristics of Robinia pseudoacacia L. Seedlings

Drought and elevated temperature are two main manifestations of global climate change scenario, which significantly affect plants＇ growth and spread. Through different temperature and water gradients control, photosynthetic performance and antioxidative enzyme activities of Robinia pseudoacacia L. seedlings were studied. The results showed that drought inhibited seedlings＇ growth, while short-term high temperature promoted their growth; height, leaf number, photosynthetic performance, POD and CAT were significantly affected by temperature, water and temperature × water; elevated temperature and drought would not only promote seedlings＇ increase of antioxidative enzyme activities, but also seedlings＇ accumulation of N and P, but excessive temperature and drought inhibited the accumulation of P.