水淹胁迫对4种园林绿化树种幼苗气体交换参数的影响
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广东省林业局资助项目(F09054)


Effects of Waterlogging Stress on Leaf Gas Exchange Parameters of Four Kinds of Garden Greening Seedlings
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    摘要:

    对乐昌含笑 Michelia chapensis、红荷Schima wallichii、红苞木Rhodoleia championii 和樟树Cinnamomum camphora 幼苗在根部淹水胁迫下的叶片气体交换参数进行了研究,以便从光合生理角度了解这4种树种的耐水淹生理机制.结果表明,随着水淹胁迫时间的增加,4种幼苗的净光合速率均呈下降趋势,35 d 时均达到最小值,分别为1.87、0.43、-0.26和0.62 μmol·m-2·s-1;4种幼苗的叶片气孔导度和蒸腾速率均呈下降趋势,35 d 时4种幼苗的气孔导度分别为0.032、0.005、0.008和0.006 mol·m-2·s-1,蒸腾速率分别为0.04、0.13、0.02和0.10 mmol·m-2·s-1;乐昌含笑、红荷和樟树的细胞间隙CO2 摩尔分数先降后升,而红苞木的细胞间隙CO2 摩尔分数持续上升;由主成分分析法得出4种幼苗耐水淹能力为乐昌含笑>红荷>樟树>红苞木.

    Abstract:

    Effects of waterlogging stress on leaf gas exchange of Michelia chapensis, Schima wallichii, Rhodoleia championii and Cinnamomum camphora were investigated so as to understand the physiological mechanism of waterlogging resistance of these four kind seedlings and provide a reference for the selection of waterlogging resistant species in southern China. The results showed that net photosynthetic rate (Pn) of the four kind seedlings tended to decrease with increasing waterlogging time. Pn of M. chapensis, S. wallichii, R. championiiand C. camphora reached their minimum with values of 1.87, 0.43, -0.26 and 0.62 μmol·m-2·s-1, respectively, in 35 days under waterlogging stress, and their stomatal conductance (Gs) tended to decrease with values of 0.032, 0.005, 0.008 and 0.006 mol·m-2·s-1, respectively, in 35 days under waterlogging stress; intercellular mole fraction of CO2(xCO2) of M. chapensisS. wallichii and C. camphora decreased followed by an increase, whereas xCO2 of R. championii continuously increased; with increasing waterlogging time, transpiration rate (Tr) of M. chapensis, S. wallichii, R. championii and C. camphora tended to decrease with values of 0.04, 0.13, 0.02, 0.10 mmol·m-2·s-1, respectively, in 35 days under waterlogging stress. The waterlogging resistance of the four kind seedlings was evaluated using principal component analysis, and the order of waterlogging resistance was M. chapensis > S. wallichii > C. camphora > R. championii.

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郭淑红,薛 立,杨振意,张 柔.水淹胁迫对4种园林绿化树种幼苗气体交换参数的影响[J].华南农业大学学报,2013,34(4):548-552

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  • 收稿日期:2012-08-11
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  • 在线发布日期: 2013-10-12