水淹对秋华柳幼苗生理生态特征的影响

被引：66

作者：

陈芳清 ^{[1
]}

郭成圆 ^{[1
]}

王传华 ^{[1
]}

许文年 ^{[1
]}

樊大勇 ^{[2
]}

谢宗强 ^{[2
]}

机构：

[1] 三峡大学生态与环境科学研究中心

[2] 中国科学院植物研究所植被与环境变化重点实验室

来源：

应用生态学报 | 2008年 / 06期

关键词：

光合速率; 蒸腾速率; 光和色素; 三峡库区; 水淹;

D O I：

10.13287/j.1001-9332.2008.0228

中图分类号：

Q945 [植物生理学];

学科分类号：

0903 ;

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(20d),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%;30d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.

引用

页码：1229 / 1233

页数：5

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