提高CO_2浓度对两种亚热带树苗叶片水分状况的影响  

Effect of elevated CO_2 concentration on leaf water regime of subtropical tree seedlings.

作　　者：韦彩妙[1] 孔国辉[1] 林植芳[1] 

机构地区：[1]中国科学院华南植物研究所,广州510650

出　　处：《应用生态学报》1997年第1期12-16,共5页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金

摘　　要：鼎湖山季风常绿阔叶林的主要优势乔木树种黧蒴和荷木的幼苗 ,盆栽于自然光照和人工调节 CO2 浓度为 50 0μl· L- 1或空气 CO2 ( 340μl· L- 1)的气罩中 3个月 .在各自生长条件下测定 ,高 CO2 下生长的黧蒴和荷木叶片平均气孔导度分别降低 1 3%和2 0 % ,蒸腾速率下降 2 0 %和 1 8% ,水分利用效率提高 1倍以上 ,不同 CO2 浓度下的植物叶片气孔导度和蒸腾速率日进程曲线也有明显差异 .处理后将幼苗置于自然条件下观测其后效应 ,第seedlings of Castanopsis fissa and Schima superba, two dominant species in monsoon evergreen broad leaf forest of Dinghushan, Guangdong Province, are grown in semi opened chambers with ambient( 340 μl·L -1 ) and elevatcd (500±50 μl·L -1 ) CO 2 concentration under natural light for three months.The stomatal conductance of leaves grown in high CO 2 is decreased by 13% for C.fissa and by 18% for S.superba,and their transpiration rate is decreased by 20% and 18%, respectively. For these two species, their water use efficiency is increased by more than 100%. The diurnal courses of stomatal conductance and transpiration rate are quite different between plants grown in elevated and ambient CO 2. When all plants are put back to ambient CO 2 without chamber, no obvious difference of stomatal conductance and transpiration rate is observed on the seventh day.

关 键 词：森林生态学 亚热带森林 幼苗 叶片 水分状况 

分 类 号：S718.512.3[农业科学—林学]