Plant Responses to Elevated Atmospheric CO 2 among Terrestrial Biomes
Plant Responses to Elevated Atmospheric CO 2 among Terrestrial Biomes
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DOI：
10.2307/3545764
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发表时间：
1996-05
期刊：
影响因子：
3.4
通讯作者：
B. Wilsey
中科院分区：
文献类型：
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作者：
B. Wilsey
尽管许多研究人员强调了植物对CO 2 升高的反应中物种间差异的重要性，但没有人定量测试生物群落之间是否存在差异。我整理了文献中的数据，发现虽然 C 3 植物确实比 C 4 植物反应更多（正如预测的那样），但与光合作用模式相比，生物群落起源是植物对 CO 2 升高的反应更好的预测因子（解释了更多的变异）。在纬度区域之间和内部发现生物群落之间植物反应的差异，来自热带和温带生物群落的植物物种比来自极地生物群落的植物物种的响应更多。在温带地区，来自森林生物群落的物种比来自草原生物群落的物种的反应更大，这进一步证明森林是大气中CO 2 水平增加的主要汇。生态系统之间的变异系数（根据每个生态系统内的平均物种反应计算）存在超过 4 倍的差异。基于这种差异，我认为生态系统在响应 CO 2 升高时物种组成的变化量可能会有所不同。
Although many researchers have stressed the importance of among-species variation in plant response to elevated CO 2 , none have quantitatively tested whether variation exists among biomes. I compiled data from the literature and found that, although C 3 plants did respond more than C 4 plants (as predicted), biome origin was a better predictor (accounted for more of the variation) of plant response to elevated CO 2 than mode of photosynthesis. Variation in plant response among biomes was found both between and within latitudinal zones, with plant species from tropical and temperate biomes responding more than plant species from a polar biome. Within the temperate zone, species from forested biomes responded more than species from a grassland biome, and this provides further evidence that forests are acting as major sinks for increasing levels of atmospheric CO 2 . A more than 4-fold difference was found among ecosystems in coefficients of variation (calculated across mean species response within each ecosystem). Based on this difference, I suggest that ecosystems may vary in the amount of change in species composition in response to elevated CO 2 .