The influence of elevated CO2 on species phenology, growth and reproduction in a Mediterranean old‐field community
The influence of elevated CO2 on species phenology, growth and reproduction in a Mediterranean old‐field community
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二氧化碳浓度升高对地中海老田群落物种物候、生长和繁殖的影响
DOI：
10.1046/j.1365-2486.1997.00092.x
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发表时间：
1997
期刊：
影响因子：
--
通讯作者：
J. Roy
中科院分区：
文献类型：
--
作者：
M. Navas;L. Sonié;J. Richarte;J. Roy
我们研究了将大气CO2浓度（[CO2]）提高到环境浓度的两倍对19种地中海物种的物候，生长和繁殖的影响。完整的整料取自旧场地，并在六个月的生长季节期间放入生长室中，其中模拟外部气候条件并调节[CO2]。结果表明，CO2浓度升高显著改变了6个树种的坐果时间，多数树种叶片和分支衰老加快。草有更少的叶子和豆科植物在高峰期生产下升高[CO2]比在环境下更多的分支。植物种子数没有显着变化下升高[CO2]，而繁殖努力的草显着抑制。生殖和营养特征表现出相关的响应[CO2]，作为物种与增强生物量有一个加快的坐果时间，一个较高的数量的水果每株植物和较高的生殖生物量在升高[CO2]比在环境条件下，而物种与抑郁的生物量有一个延迟的坐果时间，一个较低的数量的水果每株植物和较低的生殖生物量。我们的研究结果还表明，高种间变异[CO2]响应，但出现了一些趋势，在家庭层面上：生产的营养和生殖模块被压抑在草和豆类略有刺激。
We studied the effects on the phenology, growth and reproduction of 19 Mediterranean species, of elevating the atmospheric CO2 concentration ([CO2]) to twice‐ambient. Intact monoliths were taken from an old‐field and put, during a six month growing season, into growth chambers in which external climatic conditions were mimicked and [CO2] was regulated. Fruit set time was significantly changed in six species under elevated [CO2] and leaf and branch senescence accelerated in most species. Grasses had fewer leaves and legumes were more branched at peak production under elevated [CO2] than under ambient. Plant seed number was not significantly changed under elevated [CO2], whereas the reproductive effort of grasses was significantly depressed. Reproductive and vegetative characteristics showed related responses to [CO2], as species with enhanced biomass had a hastened fruit set time, a higher number of fruits per plant and a higher reproductive biomass under elevated [CO2] than under ambient conditions, while species with depressed biomass had a delayed fruit set time, a lower number of fruits per plant and a lower reproductive biomass. Our results also show a high interspecific variability in [CO2] response, but some trends emerged at the family level: the production of vegetative and reproductive modules were depressed in grasses and slightly stimulated in legumes.