摘要
以乌海胡杨岛上胡杨幼树和大树的异形叶为实验材料,研究异形叶的叶绿素荧光动力学参数、含水量以及自由水和束缚水比值变化特征。结果表明:幼树披针形叶片F0、Fm、Fv/Fm和Fv/F0的值最小,而大树卵圆形叶片的Fm、Fv/F0和Fv/Fm值最小,锯齿卵圆形叶片的F0值最小。与幼树相比,大树异形叶的自由水含量均有不同程度的上升,其中以披针形叶片自由水含量上升幅度最大,为78.94%;锯齿卵圆形和卵圆形叶片分别上升了10.60%和10.99%。幼树叶片的自由水含量与Fv/Fm、Fv/F0呈极显著正相关关系,大树叶片的含水量与Fv/Fm、Fv/F0呈极显著正相关关系。
The changes of chlorophyll fluorescence parameters and free water and bound water of three typical heteromorphic leaves of Populus euphratica,both in young trees and old trees,were investigated.The results showed that the values of F0,Fm,Fv/Fm and Fv/F0 of lanceolate leaves were the least in young trees,while those of Fm,Fv/F0 and Fv/Fm of ovate leaves were the least in old trees.Compared with the young trees,the free water content of heteromorphic leaves of old trees increased significantly by 78.94% in lanceolate leaves,and in the leaves of ovate and serrated broad-oval,it increased by 10.60% and 10.99% respectively.The analysis of correlations showed that the free water content was significantly positive related with Fv/Fm and Fv/F0 in young trees,while the relationship of total water content with Fv/Fm and Fv/F0was positive in old trees.
出处
《北京林业大学学报》
CAS
CSCD
北大核心
2010年第5期41-44,共4页
Journal of Beijing Forestry University
基金
国家自然科学基金项目(30671655)
关键词
胡杨
异形叶
叶绿素荧光动力学参数
水分生理
Populus euphratica
heteromorphic leaf
chlorophyll fluorescence parameters
water physiology
