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应用生态学报 ›› 1997, Vol. 8 ›› Issue (1): 12-16.

• 研究论文 • 上一篇    下一篇

提高CO2浓度对两种亚热带树苗叶片水分状况的影响

韦彩妙, 孔国辉, 林植芳   

  1. 中国科学院华南植物研究所, 广州 510650
  • 收稿日期:1995-01-23 修回日期:1995-06-19 出版日期:1997-01-25 发布日期:1997-01-25
  • 基金资助:

    国家自然科学基金

Effect of elevated CO2 concentration on leaf water regime of subtropical tree seedlings

Wei Caimiao, Kong Guohui, Lin Zhifang   

  1. South China Institute of Botany, Academia Sinica, Guangzhou 510650
  • Received:1995-01-23 Revised:1995-06-19 Online:1997-01-25 Published:1997-01-25

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500μl·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13%和20%,蒸腾速率下降20%和18%,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7d时处理间的气孔导度和蒸腾速率皆无明显差异

关键词: 高CO2, 黧蒴, 荷木, 气孔导率, 蒸腾速率, 水母, 浮游动物, 食物来源, 生态位, 同位素

Abstract: Potted 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) CO2 concentration under natural light for three months.The stomatal conductance of leaves grown in high CO2 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 CO2. When all plants are put back to ambient CO2 without chamber, no obvious difference of stomatal conductance and transpiration rate is observed on the seventh day.

Key words: Elevated CO2, Castanopsis fissa, Schima superba, Stomatal conductance, Transpiration rate, ecological niche., isotope, jellyfish, zooplankton, food source