POD firstly ascend and then descend basically but CAT activity descends continually, MDA content and membrane relative permeability ascend continually and MDA content descends appreciably on the middling water stress in the last-time.

• 青冈在水分胁迫下，随着胁迫时间的延长和胁迫程度的增强，组织含水量降低，蒸腾速率先升后降，而叶绿素含量则随水分胁迫时间和胁迫强度的不同而有不同的变化；