【摘要】 以1年生文冠果(Xanthoceras sorbifolia Bunge)幼苗为试材,通过盆栽控水试验,设置3个水分处理:对照、干旱胁迫和水涝胁迫,研究了生长季连续干旱和水涝对文冠果幼苗生长性状的影响。结果表明,控水处理42 d后,干旱胁迫下文冠果幼苗苗高、冠幅和地径分别比对照下降了31.6%、15.9%、和20.1%;水涝胁迫下分别比对照下降了28.8%、20.4%和12.1%。干旱胁迫下地上生物量、地下生物量和总生物量分别比对照减小了29.9%、27.7%和37.8%;水涝处理下地上生物量、地下生物量和总生物量分别比对照减小了37.8%、34.9%和44.4%。干旱、水涝胁迫下根冠比显著提高(P<0.05),分别比对照提高了11.1%和33.9%,在水分逆境中增加生物量在根部的分配是文冠果应对水分逆境的一种重要策略。更多还原

【Abstract】 One-year-old Xanthoceras sorbifolia Bunge seedlings were used as test materials. Through potted water control experiments, three water treatments were set up: control, drought stress and waterlogging stress. The effects of continuous drought and waterlogging in the growing season on Bunge were studied.The results showed that:after 42 days of water control treatment, the plant height, crown width and ground diameter of X. sorbifolia Bunge seedlings under drought stress decreased by 31.6%, 15.9%, and 20.1% respectively compared with the control; under waterlogging stress decreased by 28.8%, 20.4% and 12.1% respectively compared with the control.Aboveground biomass, underground biomass, and total biomass under drought stress were reduced by 29.9%, 27.7%, and 37.8%, respectively, compared with the control; under waterlogging treatment, the aboveground biomass, underground biomass, and total biomass were reduced 37.8%, 34.9% and 44.4% respectively compared with the control.The root-to-shoot ratio increased significantly under drought and waterlogging stress(P<0.05), which were 11.1% and 33.9% higher than the control, respectively. It is an important strategy for X. sorbifolia Bunge to increase biomass allocation in roots under water stress.更多还原