Michigan Technological University, Houghton, USA.
Environ Pollut. 2010 Apr;158(4):983-91. doi: 10.1016/j.envpol.2009.10.022. Epub 2009 Nov 11.
Photosynthetic acclimation under elevated carbon dioxide (CO(2)) and/or ozone (O(3)) has been the topic of discussion in many papers recently. We examined whether or not aspen plants grown under elevated CO(2) and/or O(3) will acclimate after 11 years of exposure at the Aspen Face site in Rhinelander, WI, USA. We studied diurnal patterns of instantaneous photosynthetic measurements as well as A/C(i) measurements monthly during the 2004-2008 growing seasons. Our results suggest that the responses of two aspen clones differing in O(3) sensitivity showed no evidence of photosynthetic and stomatal acclimation under either elevated CO(2), O(3) or CO(2) + O(3). Both clones 42E and 271 did not show photosynthetic nor stomatal acclimation under elevated CO(2) and O(3) after a decade of exposure. We found that the degree of increase or decrease in the photosynthesis and stomatal conductance varied significantly from day to day and from one season to another.
在升高的二氧化碳（CO2）和/或臭氧（O3）下的光合作用适应已经成为最近许多论文的讨论主题。我们在美国威斯康星州 Rhinelander 的 Aspen Face 地点研究了在升高的 CO2 和/或 O3 下生长 11 年后，白杨植物是否会适应。我们研究了 2004-2008 年生长季节期间每月的瞬时光合作用测量以及 A/C（i）测量的日变化模式。我们的结果表明，两个对臭氧敏感性不同的白杨克隆体的响应没有证据表明在升高的 CO2、O3 或 CO2+O3 下有光合作用和气孔适应。在暴露于十年后，克隆体 42E 和 271 均未显示出在升高的 CO2 和 O3 下的光合作用和气孔适应。我们发现，光合作用和气孔导度的增加或减少程度每天和每个季节都有很大差异。
