全球[CO₂]变化与植物水分关系

编号 lyqk000731

中文标题 全球[CO₂]变化与植物水分关系

作者 李吉跃 

作者单位 北京林业大学,北京100083

期刊名称 世界林业研究 

年份 1997 

卷号 10

期号 5

栏目编号 1

栏目名称 专题论述 

中文摘要 业已发现增加环境[CO₂]可以改善大多数植物的水分胁迫。许多研究结果表明，较低的蒸腾速率（Tr）与[CO₂]增加导致气孔关闭有关。由于[CO₂]增加引起蒸腾速率的下降和净光合速率（Pn）的提高，因此，生长在高于环境[CO₂]下的植物常常能够保持较高的水分利用效率（WUE）.也发现生长在高于环境[CO₂]下的植物能够保持较高的总水势（Ψ），增加叶面积和生物量，有较大的根/茎比率（R/S），因而通常比生长在正常环境[CO₂]下的植物更耐干旱。[CO₂]增加诱导产生的植物结构的变化（比如导管或管胞的解剖结构、叶比导度等），可能与木质部空穴脆弱性的变化有关，也可能与栓塞逃逸的环境条件相联系。这些重要的问题需要进一步的研究。

关键词 CO₂浓度  植物水分  水分利用效率  水势  蒸腾速率  气孔反应  生长 

英文标题 Relations Between Global[CO₂] Change and Plant Water

作者英文名 Li Jiyue

单位英文名 Beijing Foresty University,100083 Beijing,China

英文摘要 Increased ambient [CO₂] has been found to ameliorate water stress in the majority of species studied. The results of many studies indicate that lower transpiration(Tr) is associated with high [CO₂] induced stomatal closure. It was found that the decreases in transpiration and increases in net photosynthesis (Pn), resulted in plants in high [CO₂] environment, often to maintain higher water use efficiencies (WUE) than in the normal [CO₂] environment. Growing at high [CO₂] were also found to maintain higher total water potentails(Ψ), to increase leaf area and biomass production, have larger root-to-shoot ratios(R/S), and to be generally more drought tolerance than those growing at ambient [CO₂] levels. High [CO₂]-induced changes in plant structure(i.e., vessel or trachied anatomy, leaf specific conductivity) may be associated with changes in vulnerability to xylem cavitation or in environmental conditions in which runaway embolism is likely to occur. Further study is needed to resolve these important issues.

起始页码 16

截止页码 25

投稿时间 1996/4/29

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