西南喀斯特地区四种植物水分生理的初步研究  

A preliminary study on the water physiology of four plant species in karst area of Southwest China

作　　者：莫凌[1] 黄玉清[1] 覃家科[1] 王晓英[1] 陆树华[1] 袁维圆[1] 

机构地区：[1]广西壮族自治区中国科学院广西植物研究所,广西桂林541006

出　　处：《广西植物》2008年第3期402-406,共5页Guihaia

基　　金：中科院西部之光人才培养项目(2005);广西自然科学基金(0575009,0640137)~~

摘　　要：通过对喀斯特地区的4种植物红背山麻杆、圆叶乌桕、青檀和水冬瓜的水分特征进行测定和比较,结果表明:植物的组织含水量、临界饱和亏缺和需水程度均存在显著差异,其抗旱能力以青檀最强;水分利用效率饱和点以落叶灌木红背山麻杆最高,在600μmol.m-2·s-1左右,光辐射与气孔导度呈对数关系;而三个落叶乔木树种的WUE的光饱和点均在400μmol·m-2·s-1左右,光辐射与蒸腾速率、气孔导度均呈线性极显著相关关系;观测结果没有显示蒸腾饱和现象。The water characteristics of Alchornea trewioides, Sapiurn rotundi foliurn , Pteroceltis tatarinowii and Sinoadina racemosa were measured and compared in the paper. The results showed that the tissue water content,critical saturation deficit and the water requirement degree were significantly different among the examined four plant species. The drought-resistance of Pteroceltis tatarinowii,a deciduous shrub,was the strongest among them,Alchornea trewioides had the highest WUE saturation point of 600 μmol·m^-2·s^-1, the PAR was logarithmly correlated with stomata eonduetanee; the LSP of water use efficiency of the three deciduous trees species was all at 400 μmol·m^-2·s^-1. The PAR was significantly correlated with transpiration and the stomata conductance,and no transpiration saturation phenomenon in the four plant species was observed.

关 键 词：相对含水量 水分饱和亏缺 蒸腾速率 水分利用效率 气孔导度 西南喀斯特地区 

分 类 号：Q945.79[生物学—植物学]