柠条锦鸡儿不同部位茎段水力结构特征的比较研究  

Comparative study on hydraulic architecture characteristics of different parts stem of Caragana korshinskii

作　　者：解李娜[1,2] 魏亚冉[1,2] 李清芳[1,2] 满良[1,2] 马成仓[1,2] 

机构地区：[1]天津师范大学生命科学学院,天津300387 [2]天津师范大学天津市细胞遗传与分子调控重点实验室,天津300387

出　　处：《天津师范大学学报（自然科学版）》2012年第2期66-68,共3页Journal of Tianjin Normal University：Natural Science Edition

基　　金：国家自然科学基金资助项目(30960083;31170381)

摘　　要：比较荒漠植物柠条锦鸡儿不同部位茎段的水力结构特征.研究表明:随着茎木质部横截面面积增大,柠条锦鸡儿的胡伯尔值、比导率和叶比导率增加.柠条锦鸡儿存在着水分运输的限速区;限速区胡伯尔值高于非限速区,比导率和叶比导率低于非限速区.柠条锦鸡儿的水分运输主要受到分叉区(限速区)和枝条末端的细枝限制.The hydraulic architecture characteristics of different parts of stem segment in the desert species Caragana korshinskii were compared.The results showed that the Huber value,specific conductivity and leaf specific conductivity of C.korshinskii all raised gradually with the increase of cross sectional area of xylem stem.C.korshinskii had constriction area in water transport.The Huber value in constriction area was higher than that in no-restriction area,while the specific conductivity and leaf specific conductivity in constriction area were lower than that in no-restriction area.In conclusion,the xylem water transport of C.korshinskii was mainly influenced by the constriction area and the twigs.

关 键 词：柠条锦鸡儿 水力结构 限速区 非限速区 茎直径 

分 类 号：Q948.1[生物学—植物学]