水分胁迫对脂松苗木针叶质膜透性和保护酶活性的影响

以2年生盆栽脂松苗木为材料，研究了不同土壤水分处理（含干旱和水渍胁迫）及解除胁迫后对脂松苗木针叶质膜透性和保护酶活性的影响。结果表明，随着干旱与水渍胁迫时间的延长，脯氨酸、可溶性糖和丙二醛(MDA)含量均有所上升；过氧化氢酶(CAT)活性逐渐降低；过氧化物酶(POD)活性逐渐升高；解除胁迫后，各项指标均有不同程度的恢复，其中田间含水量为40%、80%、100%处理（即FC40%、FC80%、FC）恢复较快；干旱处理中FC20%和水渍处理中的水渍胁迫（FL）对苗木的生理影响在解除胁迫后14天尚未完全恢复且表现为水淹处理恢复能力较干旱处理差。综上，FC60%为最适土壤水分含量，综合表现最佳。

Effects of Water Stress on Plasma membrane Permeability and Protective Enzyme Activities of Red Pine Seedlings Needles

Two-year-old red pine seedlings were grown in soils to study the effects of different water treatments (including aridity and waterlogging stress) and relief stress on the plasma membrane permeability and protective enzyme activities of red pine seedling needles. The main results were as follows: with the time extension of aridity and waterlogging stress, the contents of proline, soluble sugar and malondialdehyde (MDA) increased; the activities of catalase (CAT) decreased; and the peroxidase (POD) activities rose. After relief stress, the tested indices of all treatments experienced different levels of recovery. Among them, the tested indices of FC40%, FC80% and FC restored relatively fast. However, indices of FC20% and FL could not completely recover within 14 days. Moreover, FL had the worst physiological performance. To sum up, 60% was the optimum soil water content to red pine seedlings, because the seedlings under this circumstance presented the most comprehensive physiological performance.