宜昌黄杨对夏季淹水的生理生态学响应

被引：17

作者：

薛艳红 ^{[1
]}

陈芳清 ^{[1
]}

樊大勇 ^{[2
]}

谢宗强 ^{[2
]}

机构：

[1] 三峡大学生态与环境研究中心

[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：

生物多样性 | 2007年 / 05期

关键词：

Buxus ichangensis; 光合速率; 气孔导度; 根系活力; 三峡地区;

D O I：

暂无

中图分类号：

Q945.79 [植物生理生态学];

学科分类号：

071012 ; 0713 ;

摘要：

宜昌黄杨(Buxus ichangensis)主要分布于长江三峡地区的消落带,对该地区的水土保持和岸坡地稳定起着十分重要的作用。作者通过模拟夏季淹水研究了宜昌黄杨的形态特征、光合作用和根系活力的变化特征,揭示了宜昌黄杨对淹水的生态学响应规律。结果表明宜昌黄杨在淹水过程中产生了皮孔、不定根等形态适应特征,经过60d的淹水处理,植株仍全部存活,表现出较强的适应能力。但是植株的生长仍然受到淹水的显著影响:淹水条件下宜昌黄杨的最大光合速率、气孔导度和根系活力与对照相比都显著下降,60d后分别只有对照的19.24%、24.04%和4.78%。在不同处理阶段这些指标下降的幅度不同:初期的下降幅度最大,后期下降幅度减少,其中根系活力在后期还有所回升。叶绿素A的含量随淹水延长持续下降,后期有所回升,而叶绿素B和类胡萝卜素的变化却不大。最后,作者对该物种在水电工程库区退化消落带植被生态恢复中的应用提出了一些建议。

引用

页码：542 / 547

页数：6

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