红树林生境中互花米草气孔导度的动态变化  

Dynamics in leaf stomatal conductance of Spartina alterniflora in mangrove habitats.

作　　者：覃盈盈[1] 甘肖梅[1] 蒋潇潇[1] 李军伟[1] 韦锋[1] 梁士楚[1] 

机构地区：[1]广西师范大学生命科学学院,广西桂林541004

出　　处：《生态学杂志》2009年第10期1991-1995,共5页Chinese Journal of Ecology

基　　金：国家自然科学基金项目(30660036);广西自然科学基金项目(桂科自0728096);广西研究生教育创新计划资助项目(2008106020907M266)

摘　　要：以生长在山口红树林保护区内壤质海滩上的互花米草(Spartinaalterniflora)为对象,对午间退潮到天黑这一特定时间段其叶片气孔导度及相应环境因子的变化进行了测定和分析。结果表明:互花米草不同叶位的叶片气孔导度不同,在垂直方向上,其排序大致呈现中上部>顶部>中下部>下部的趋势;叶片气孔导度与光强、叶温呈幂函数关系,与时间、相对湿度呈负指数函数关系;在相对湿度为50%～60%时,气孔导度最大,随着湿度的增加,气孔有关闭的趋势,气孔导度变小;互花米草植株中部的叶片对整个植株光合产物积累的贡献较大。各种环境因子对互花米草气孔的开闭存在交互作用,因此,互花米草叶片的气孔导度是对环境因子的综合反应。The study on the dynamic changes in the leaf stomatal conductance of invasive plant of upper part 〉 top 〉 lower-mid part 〉 lower part, and had a power function relationship with light intensity and leaf temperature but a negative exponential function relationship with time and relative humidity. It was the greatest at 50%-60% relative humidity, and became smaller with the further increase of the humidity. The mid-part leaves had the greatest contribution to the ac- cumulation of photosynthates. There existed interactions among diverse environmental factors on the stomatal opening and closure, and thus, the leaf stomatal conductance of S. alterniflora could be viewed as a comprehensive response to environmental parameters.

关 键 词：互花米草 气孔导度 光强 叶温 相对湿度 

分 类 号：Q948[生物学—植物学]