【摘要】 对沉水植物苦草 (VallisneriaspiraslisL .)在高浓度CO2 (10 0 0 μmol/mol)和对照浓度CO2 (35 0 μmol/mol)下的生长特征和生理生化指标进行了比较研究。在实验的早期阶段 ,从冬芽出苗的苦草幼株在高浓度CO2 下生长明显加快 ,但由于后期生长逐渐放慢 ,其最终总生物量比对照组仅高出 11.6 %。尽管高浓度CO2 也促进了根的生物量的累积 ,但是由于苦草叶片生物量占总株生物量比例大 ,高浓度CO2 下苦草生物量的增加主要反映为叶片生物量的增加。在实验后期阶段 ,高浓度CO2 促进了苦草冬芽的形成。实验过程中 ,苦草的根叶生物量比 (RLR)在高浓度和对照浓度CO2 下均有所降低 ,二者之间无明显统计学差异。高浓度CO2 下苦草叶片中叶绿素含量和可溶性蛋白质含量降低 ,而可溶性总糖含量明显增加。更多还原

【Abstract】 Growth and physio biochemistry responses of Vallinseria spiralis L.were studied comparatively at ambient(about 350μmol mol -1 )and elevated(about 1000μmol mol -1 )CO 2 concentration.Young plants under elevated CO 2 grew faster than their counterparts in ambient CO 2 at early stage.But as this superiority did not persist throughout the experiment,finally plants at CO 2 enriched environment accumulated just 11.6% more total biomass than those at control.The total biomass advantage of the V.spiralis under elevated CO 2 was primarily due to its leaf weight increment superiority over the control at the end of the experiment.More turions formed under elevated CO 2.Root/leaf ratio trended to decrease under both elevated and ambient CO 2,but no significant difference was detected.Under elevated CO 2 chlorophyll and soluble protein content decreased,While total soluble sugar content increased significantly.更多还原