CO2浓度对蓝靛果忍冬光合生理指标的影响

Effect of CO2 Concentrations on Photosynthetic Physiological Variable of Lonicera edulis

利用LI—COR 6400测量了不同COz浓度条件下蓝靛果忍冬（Lonicera edulis）不同枝条的净光合速率（PN）、蒸腾速率（E）、气孔导度（Cond）、瞬时水分利用效率（WUE）及叶面饱和蒸气压亏缺（VPD）．营养枝、繁殖枝和萌生枝条的PN，WUE，VPD及E均随CO2浓度升高而增大，PN增加幅度较大，E增加幅度较小．在高CO2浓度（物质的量比为1013）条件下，繁殖枝叶片最大PN（11．8wnol·m12·s11）与萌生枝（11．7μmol·m^-2·s^-1）相近，而营养枝的最大PN（11．0μmol^-2·s^-1）出现在CO2浓度（1．6×10^-3）条件下，其PN最大值虽与前两者差异不大，但C02浓度却差异很大．在果期繁殖枝、萌生枝的各项光合生理指标相近，但与营养枝差异较大．

Net photosynthetic rate（PN）, transpiration rate（ E ）, stomatal conductance（ Cond ）, vapor pressure deficit at the leaf surface（ VPD ） and water use efficiency（ WUE = PN/E ） of perennial Lonicera edulis leaves were investigated by Li-COR 6400 portable photosynthesis system under a series of CO2 concentrations. For the vegetative shoot, the reproductive shoot, the coppice shoot, PN, WUE, VPD and E increased with the increasing of CO2 concentration, the increasing of PN was larger than that in E. At elevated CO2 concentration of 1 000 × 10^-6, the maximal PN of the reproductive shoot is 11.8 μmol.m^-2.s^-1 and the coppice shoot is 11.7 μmol＇m^-2.s^-1, but the maximal PN of vegetative shoot is 11.0 μmol＇m^-2.s^-1 at elevated CO2 concentration of 1 600 × 10^-6 Some physiological indexes of the reproductive shoot and the coppice shoot is very different from the vegetative shoot in seed period.