5种喀斯特生境植物叶片解剖结构特征  

Leaf Anatomic Traits of 5 Species in Southwestern China's Karst Region

作　　者：董蕾[1,2] 曹洪麟[1] 叶万辉[1] 徐志防[1] 吴林芳[1] 陈贻竹[1] 

机构地区：[1]中国科学院华南植物园,广州510650 [2]中国科学院研究生院,北京100039

出　　处：《应用与环境生物学报》2011年第5期747-749,共3页Chinese Journal of Applied and Environmental Biology

基　　金：中国科学院西部行动计划重大项目(No.KZCX2-XB2-08)资助~~

摘　　要：对我国喀斯特地区几种不同生活型植物——常绿植物桂花(Osmanthus fragrans Lour.)、竹叶椒(Zanthoxylunarmatum DC),落叶植物红背山麻杆(Alchornea trewioides Muell.),草本植物石上莲(Oreocharis benthamii Clark var.reticulata Dunn),草本植物单枝竹(Monocladus saxatilis Chia,Fung et Y.L.Yang)的叶片形态解剖特征(叶片厚度、气孔密度、气孔结构等)进行了观察和测量,发现差异较大:竹叶椒角质层较厚,红背山麻杆的叶片较厚,单枝竹叶片上下表皮均有气孔,桂花气孔密度最高,石上莲的气孔纵径最长.结果表明:1)喀斯特生境植物存在着普遍的抗旱功能性解剖结构,用以适应喀斯特地区的特殊干旱气候;2)不同生活型植物对干旱选择的策略不同.In order to understand the leaf anatomic traits of the plants in Karst habitat,five species（Osmanthus fragrans Lour.,Alchornea trewioides Muell.,Monocladus saxatilis Chia,Fung et Y.L.Yang,Zanthoxylun armatum DC and Oreocharis benthamii Clark var.reticulata Dunn） representing four life forms were collected from the Karst region in South China.The leaves were measured for their thickness and stomatal density.The results indicated that the thickness and stomatal density of the leaves were significantly different among the life forms： Thicker cuticle for Z.armatum,thicker leaves for A.trewioides,stomata existing both in upper and lower epidermis for M.saxatilis,highest stomatal density for O.fragrans,and longest stomatal length for O.benthamii.The leaf anatomic traits of the different life forms in Karst region demonstrated their functional differentiation in adapting to dry environment.Tab 3,Ref 20

关 键 词：喀斯特生境 干旱 叶片解剖特征 生存策略 

分 类 号：Q944[生物学—植物学]