Changes in petiole hydraulic properties and leaf water flow in birch and oak saplings in a CO2-enriched atmosphere
Changes in petiole hydraulic properties and leaf water flow in birch and oak saplings in a CO2-enriched atmosphere
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DOI：
10.1093/treephys/28.2.287
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发表时间：
2008-02-01
期刊：
影响因子：
4
通讯作者：
Koike, Takayoshi
中科院分区：
文献类型：
--
作者：
Eguchi, Norikazu;Morii, Noriko;Koike, Takayoshi
木本植物的水分关系与木质部的水力特性密切相关。高浓度的CO2（[CO2]）通常会降低蒸腾作用和气孔导度（g（s）），但是关于大气[CO2]对木质部水力特性的影响的信息很少。为了确定水流和水力结构之间的关系，在高[CO2]，我们调查了4年生的扩散孔桦max-imowicziana Regel和环孔蒙古栎菲施幼树的阳和阴叶的反应。来自Ledeb。SSP.在肥沃的棕色森林土壤或贫瘠的火山灰土壤上，暴露于500 μ mol CO2 mol（-1）中3年。无论物种和土壤类型如何，[CO2]升高始终会降低水流（即，g（s）和叶片比导水率）和叶柄导管总面积的影响，而对阴生叶的这些参数没有影响，可能是因为阴生叶的g（s）已经很低了。水流量在升高[CO2]的变化与叶柄水力特性的变化。
Water relations in woody species are intimately related to xylem hydraulic properties. High CO2 concentrations ([CO2]) generally decrease transpiration and stomatal conductance (g(s)), but there is little information about the effect of atmospheric [CO2] on xylem hydraulic properties. To determine the relationship between water flow and hydraulic structure at high [CO2], we investigated responses of sun and shade leaves of 4-year-old saplings of diffuse-porous Betula max-imowicziana Regel and ring-porous Quercus mongolica Fisch. ex Ledeb. ssp. crispula (Blume) Menitsky grown on fertile brown forest soil or infertile volcanic ash soil and exposed to 500 mu mol CO2 mol(-1) for 3 years. Regardless of species and soil type, elevated [CO2] consistently decreased water flow (i.e., g(s) and leaf-specific hydraulic conductivity) and total vessel area of the petiole in sun leaves; however, it had no effect on these parameters in shade leaves, perhaps because g, of shade leaves was already low. Changes in water flow at elevated [CO2] were associated with changes in petiole hydraulic properties.