臭柏抗旱生理特性研究

在桶栽控水和聚乙二醇（PEG）渗透胁迫条件下，测定臭柏幼苗针叶的保水力、相对含水量、水分饱和亏、相对电导度、叶绿素含量、MDA含量、光合生理指标等，以研究臭柏幼苗的抗旱生理特性．结果表明：当桶栽控水20天，土壤含水量下降为7．89％时，对幼苗的光合生理指标没有明显影响；在渗透胁迫下，臭柏幼苗针叶相对含水量、叶绿素含量、自由水含量等呈下降趋势，水分饱和亏、相对电导度、MDA含量、束缚水含量等呈上升趋势；在严重胁迫下，生理指标变幅较大．臭柏幼苗针叶的保水能力强，束缚水含量较高，抗旱性强．

On Drought-resistance Physiology of Sabina vulgaris

The physiological property of drought resistance of Sabina vulgaris seedlings planted in pot experiment was studied with two comparative methods,i.e.,water controlling and PEG osmotic stressing,by means of measuring a series of indexes including water holding capacity,relative water content,relative water deficit,relative electrical conductiveitv,contents of chlorophy ll,MDA as well as the photosynthetic rate.It was showed by the experiments thaa the photosynthetic rate was not significantly reduced when there was no irrigation applied for 20 days,and when the water content in the soil dropped to 7.89%.The relative water content,contents of chlorophyll and free water in leaves of Sabina vulgaris seedlings dropped while the relative water deficit,relative electrical conductivity,MDA content and bound water content increased under moderate osmotic stress conditions.Under the condition of serious omsmotic stress,there were greater changes to the above physiological indices.It was induced from the experiments that Sabina vulgaris was a drought resistant species with high water holding capacity and high bound water content in the leaves of the seedlings.