Abstract:

Eighty-four published papers were synthesized using meta-analysis (a statistical method to summarize the different individual studies under the same subject), with results of the environmental factors (soil water deficit, low soil nitrogen, high temperature and high concentration O3) affecting significantly the response of plant to elevated atmospheric CO2 concentrations. Under unstressed condition, the overall effect sizes of twelve ecophysiological variables of C3 plants were negative, other twelve positive. For negative effect group, the first five variables ranked as: stomatal conductance ( g s)> leaf dark respiration rate （Rd）>leaf nitrogen content on a mass basis ( N m)>leaf protein content on a mass basis ( Prm)>leaf nitrogen content on a structural mass basis ( Ns); for positive one, root biomass ( Bt)>shoot biomass ( Bs)>leaf starch content on a mass basis ( St )>light saturated net photosynthetic rate ( A )>total biomass ( Bt). The Bt and A of C3 plants increased 30.01% and 40.36% respectively under unstressed condition, while g s decreased 30.39%.

植物生理生态指标对大气CO₂浓度倍增响应的整合分析
郑凤英* 彭少麟
（中国科学院华南植物研究所，广州510659）

摘要：对84篇文献有关植物对大气CO₂浓度倍增响应进行整合分析(一种对同一主题下多个独立实验进行综合的统计学方法),发现环境因素(土壤水分亏缺、土壤低氮、高温和高浓度O3) 显著地影响植物对高CO₂2浓度的响应.无任何环境胁迫时,高CO₂浓度对C3植物的12个植物生理生态指标产生负效应,对另12个则表现正效应,负响应最强的前5个指标为:气孔导度(gs)＞暗呼吸速率(Rd)＞单位叶重中的氮含量(Nm)＞单位叶重中蛋白质含量(Prm)＞单位叶结构重量中氮含量(Ns);正响应最强烈的前5个指标为:根生物量(Br)＞地上部生物量(Bs)＞单位叶重中淀粉含量(St)＞光饱和时的光合速率(A)＞总生物量(Bt).可见植物的气体交换和生物量受高CO₂ 浓度影响较大,叶化学成分的变化则以淀粉、单位叶重含氮量和单位叶重蛋白质含量较为明显.无任何胁迫时,C3植物的总生物量和光饱和时的光合速率分别提高30.01%和40.36%; 气孔导度下降30.39%.

关键词： 植物生理生态指标；大气CO₂浓度升高；整合分析

Key words: plant ecophysiological variable, elevation of atmospheric CO2 concentration, meta-analysis