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水淹对秋华柳幼苗生理生态特征的影响
引用本文:陈芳清,郭成圆,王传华,许文年,樊大勇,谢宗强.水淹对秋华柳幼苗生理生态特征的影响[J].应用生态学报,2008,19(6):1229-1233.
作者姓名:陈芳清  郭成圆  王传华  许文年  樊大勇  谢宗强
作者单位:1. 三峡大学生态与环境科学研究中心,湖北宜昌,443002
2. 中国科学院植物研究所植被与环境变化重点实验室,北京,100093
基金项目:国家科技支撑计划 , 湖北省清江水电开发有限公司科研资助项目
摘    要:秋华柳广泛分布于三峡库区河谷与溪流坡岸,对水土保持及稳固堤岸具有重要作用.通过模拟水淹试验,研究了秋华柳幼苗对水淹的适应能力及机理.结果表明:所有处理秋华柳植株全部存活.水淹对秋华柳幼苗的最大光合速率、蒸腾强度、气孔导度和水分利用效率都有显著影响.水淹初期(20 d),植株的各项生理指标值变化较小,其中最大光合速率和蒸腾强度分别比对照下降18.5%和2.2%;30 d后,分别下降53.4%和23.7%,随后又趋于稳定.植株叶绿素和类胡萝卜素含量及其比值均随水淹时间的增加而逐渐降低,其中叶绿素/类胡萝卜素比值在4.873~6.883,而叶绿素a/b比值则在2.855~3.912之间变动.水淹还诱导秋华柳幼苗产生不定根,有利于植株氧气的补给.说明秋华柳幼苗对水淹的适应能力较强,可作为库区水位消落带植被恢复与重建的先锋物种.

关 键 词:光合速率  蒸腾速率  光和色素  三峡库区  水淹  水淹  秋华  幼苗  生理生态特征  影响  seedlings  characteristics  waterlogging  先锋物种  恢复与重建  植被  消落带  水位  库区  氧气  不定根  类胡萝卜素含量  时间  比值  叶绿素
文章编号:1001-9332(2008)06-1229-05
收稿时间:2007-09-24
修稿时间:2007年9月24日

Effects of waterlogging on ecophysiological characteristics of Salix variegate seedlings.
CHEN Fang-qing,GUO Cheng-yuan,WANG Chuan-hua,XU Wen-nian,FAN Da-yong,XIE Zong-qiang.Effects of waterlogging on ecophysiological characteristics of Salix variegate seedlings.[J].Chinese Journal of Applied Ecology,2008,19(6):1229-1233.
Authors:CHEN Fang-qing  GUO Cheng-yuan  WANG Chuan-hua  XU Wen-nian  FAN Da-yong  XIE Zong-qiang
Institution:Center of Ecological and Environmental Science, China Three Gorges University, Yichang 443002, Hubei, China. fqchen@ctgu.edu.cn
Abstract:Salix variegate, a widely distributed species along the riverbank in Three Gorges Reservoir area, plays an important role in soil conservation and riverbank stabilization. Waterlogging from April to May was simulated in 2006 to test the adapting ability and mechanism of S. variegate seedlings to water environment change resulted from the construction of Three Gorges Project. The results showed that under waterlogging, all of the S. variegate seedlings could survive, but their maximum photosynthesis (Pmax), transpiration rate (Tr), water use efficiency (WUE), and stomatal conductance (Gs) decreased significantly with the prolongation of waterlogging. In the early period of waterlogging (20 days), these indices changed little, with the Pmax and Tr decreased by 18.5% and 2.2%, respectively, compared with the control. After 30 days, Pmax and Tr decreased by 53.4% and 23.7%, respectively, and then, kept stable. The contents of chlorophyll and carotenoid and their ratio decreased significantly with the prolongation of waterlogging, while the ratio of chlorophyll a to b increased significantly. The ratio of chlorophyll to carotenoid ranged in 4.873-6.883, and that of chlorophyll a to b ranged in 2.855-3.912. Adventitious roots were developed after waterlogging, which would benefit the oxygen supply for the plants. It was suggested that S. variegate had good adaptability to waterlogging, and could be used as a pioneer species in the restoration of degraded water-level fluctuation zone.
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