Leaf gas exchange responses of 13 prairie grassland species to elevated CO2 and increased nitrogen supply
Leaf gas exchange responses of 13 prairie grassland species to elevated CO2 and increased nitrogen supply
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DOI：
10.1046/j.1469-8137.2001.00095.x
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发表时间：
2001-05-01
期刊：
影响因子：
9.4
通讯作者：
Reich, PB
中科院分区：
文献类型：
--
作者：
Lee, TD;Tjoelker, MG;Reich, PB
本文介绍了13种多年生植物对升高的二氧化碳浓度和氮含量的叶片气体交换响应，这些植物代表了四个功能群：C - 3禾本科植物、C - 4禾本科植物、豆科植物和非豆科草本植物。了解二氧化碳和氮的影响如何相互作用对于预测植物群落对全球变化的响应非常重要。在当前环境和升高的（560 μmol/mol）二氧化碳浓度（开放式空气二氧化碳富集）下，结合土壤氮处理，植物在单一种植条件下田间生长了两个生长季。所有物种，无论其功能群如何，都对升高的二氧化碳表现出明显的光合适应，导致光合作用（A）的刺激极小，C - 3禾本科植物平均为 + 15%，草本植物为 + 8%，豆科植物为 + 7%，C - 4禾本科植物为 - 2%。对于所测量的任何叶片性状，二氧化碳和土壤氮供应的影响都没有相互作用。升高的二氧化碳持续降低气孔导度（g(s)），导致A/g(s)增加40%。这种光合作用的显著适应在程度上大于大多数田间研究，并且与在升高的二氧化碳条件下生长时气孔导度降低和叶片氮浓度降低的综合效应有关。
Leaf gas exchange responses to elevated CO2 and N are presented for 13 perennial species, representing four functional groups: C-3 grasses, C-4 grasses, legumes, and nonleguminous forbs. Understanding how CO2 and N effects interact is important to predict plant community response to global change.Plants were field-grown in monoculture under current ambient and elevated (560 mu mol mol(-1)) CO2 concentrations (free-air CO2 enrichment), in combination with soil N treatments, for two growing seasons.All species, regardless of functional group, showed pronounced photosynthetic acclimation to elevated CO2, resulting in minimal stimulation of photosynthesis (A) averaging +15% in C-3 grasses, +8% in forbs, +7% in legumes and -2% in C-4 grasses. The effects of CO, and soil N supply did not interact for any leaf traits measured. Elevated CO2 consistently decreased stomatal conductance (g(s)) leading to 40% increase in A/g(s).This substantial acclimation of photosynthesis was greater in magnitude than in most field studies, and was associated with the combined effects of decreased g(s) and decreased leaf N concentrations in response to growth under elevated CO2.