Responses of Transpiration Characteristics and Water Use Efficiency of Pinus Elliottii Leaf to Elevated CO2 Concentration

GONG Wei

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Responses of Transpiration Characteristics and Water Use Efficiency of Pinus Elliottii Leaf to Elevated CO2 Concentration

更新时间：2024-11-07

- Responses of Transpiration Characteristics and Water Use Efficiency of Pinus Elliottii Leaf to Elevated CO2 Concentration
- Vol. 19, Issue 5, Pages: 178-182(2005)
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  CLC： S791.189Q945.1
- Published：2005
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GONG Wei. Responses of Transpiration Characteristics and Water Use Efficiency of Pinus Elliottii Leaf to Elevated CO2 Concentration[J]. 2005, 19(5): 178-182.
DOI：

GONG Wei. Responses of Transpiration Characteristics and Water Use Efficiency of Pinus Elliottii Leaf to Elevated CO2 Concentration[J]. 2005, 19(5): 178-182. DOI：

摘要

在不同CO2浓度下，测定了湿地松上年生针叶和当年生针叶净光合速率（Pn）、蒸腾速率（Tr）、胞间CO2浓度（Ci）、气孔导度（Cs）和叶面饱和水汽压亏缺（Vpdl）随光照强度的变化。结果表明；Ci和Vpdl随光照强度增强而减小；G5，Pn和Tr均随光照强度增强而增大．在达到光饱和点后G5和Pn随光照强度增强而逐渐减小；WUE随光照强度增强呈先增大，达到最大值后又逐渐减小。Ci，vpdl随CO2浓度升高而增大；Gs和Tr随CO2浓度升高而减小；Pn和WUE在CO2浓度为400～1200μmol／mol时随CO2浓度升高而增大，当CO2浓度升高至1600μmol／mol时．Pn和WUE减小；同时．随着CO2浓度升高，上年生针叶光饱和点提高。

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