西藏柏木抗旱生理研究

Physiological Study on the Drought Resistance of Cupressus torulosa D.Don

本研究采用人工干旱对比盆栽试验方法，探讨在水分胁迫下，西藏柏木生理生化指标变化规律及其抗旱机制。研究结果表明：在干旱条件下，叶水势降低，水分饱和亏缺增加，失水速率减小；电解质渗透率略有降低，脯氨酸累积增加，叶绿素ａ／ｂ值变大；生长阻滞含水量是田间持水量的５７％。综合分析表明，西藏柏木属于抗旱植物，抗旱机制是低水势忍耐脱水。

Through a series of conditioned comparison,this study focused on physiology of drought resistance of C.Torulosa D.Don,nowdays a widely developed edemic tree species for subtropic areas.The results are accordingly summerized as follows: (1)A constant water loss of soil can significantly cause a decrease in leaf water potential and the loss velocity of leaf water,while the saturation and deficit of water chlorophyll a/b and protine accumulation will increase. (2)57 percent of field capacity can prohibit its growth. (3) C.Torulosa D.Don,which presents a somewhat strong drought resistance,should be formulated as a pattern of enduring dehydration with low water potential.