几种沙生植物水分代谢问题探讨

采用野外采集与室内实验相结合的方法,对磴口地区8种沙生植物的水分代谢进行了相关研究。结果表明：沙生植物的水势与抗脱水能力呈负相关,与蒸腾日变幅呈正相关,可溶性糖、盐含量对沙生植物的水势起决定作用,蛋白质含量和亲水基团的多少决定束/自比的大小。出现与无贮水组织的沙生植物中的束/自比与日蒸腾强度之间的相关性,在具贮水组织的...

Water Metabolism of Several Psammophyte

By use of field collection and indoor test, the water metabolism of eight kinds of psammophyte distributed in Dengkou have been studied. The results show that there is a negative correlation between water potential and an- ti-dehydration of psammophyte, there is a positive correlation between water potential and transpiration daily varia- tion amplitude, the content of soluble sugar and salt have played a decisive role on water potential of psammophyte, and the protein content and quantity of hydrophilic group can decide the ratio of bound water to free water. The cor- relation between the ratio of bound water to free water and transpiration intensity in psammophyte without water stor- age parenchyma doesn＇ t appear in psammophyte with water storage parenchyma. There is a negative correlation be- tween the protein content and the ratio of bound water to free water in psammophyte with water storage parenchyma in leaves, which is a positive correlation in psammophyte without water storage parenchyma. There isn＇ t obvious relationship between water potential and the ratio of bound water to free water in psammophyte without water storage parenchyma.