Water Relations and Dioecy

从大量雌雄异株植物的研究中可以清楚地看出 （分离雄性和雌性植物）从不同的生态系统， 两性在同一微生境中的分布并不均等。 然而，人们对这一现象的生理基础知之甚少。 分布的差异。 这项研究将测试几个 与水的可能差异有关的假设 两性关系及其对生产力的影响 和生存 在这个项目的实验技术中， 是分析水的稳定同位素比率 （特别是D/H比），以检测 每棵树汲取水分的深度。 的 信息是至关重要的，因为它说明了很多关于 个别树木的生长和存活。 由于该信息 也记录在树木的年轮中， 应提供关于水源的基本长期信息 被植物利用，并与碳同位素比率结合 分析应提供生产力的综合衡量 在这种情况下，水的消耗量。 中 我们的雌雄异株物种的应用方面（如杨树） 构成纸浆用树种的主要部分 生产 由于这项研究的重点是参数 影响增长、生产力和生存， 直接应用于这一重要行业。

It is clear from a number of studies of dioeceous plants (separate male and female plants) from diverse ecosystems that two sexes are not equally distributed in the same microhabitats. Yet little is understood of the physiological bases of the difference in distribution. This study will test several hypotheses relating to the possible differences in water relations between sexes and their implications for productivity and survival. Among the experimental techniques in this project will be the analysis of stable isotope ratios of water (specifically D/H ratios) at natural abundance levels to detect the depths from which individual trees are extracting water. The information is critical as it says much about the potential for growth and survival of individual trees. Since this information is also recorded in tree rings as plants grow, our analysis should provide fundamental long-term information on water sources used by plants and in combination with carbon isotope ratio analysis should provide an integrated measure of the productivity to water consumption ratio under these conditions. Among the applied aspects of our dioeceous species (such as poplars) constitute a major fraction of the tree species used for pulp production. Since this study are focusing on the parameters affecting growth, productivity and survival, they could have direct application to this important industry.