期刊
ENVIRONMENTAL POLLUTION
卷 158, 期 4, 页码 1000-1007出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2009.09.001
关键词
Photosynthesis; Stomatal conductance; Vapour-pressure difference; Environmental stress; CO2/O-3
The diurnal changes in light-saturated photosynthesis (Pn) under elevated CO2 and/or O-3 in relation to stomatal conductance (g(s)), water potential, intercellular [CO2], leaf temperature and vapour-pressure difference between leaf and air (VPDL) were studied at the Aspen FACE site. Two aspen (Populus tremuloides Michx.) clones differing in their sensitivity to ozone were measured. The depression in Pn was found after 10:00 h. The midday decline in Pn corresponded with both decreased g(s) and decreased Rubisco carboxylation efficiency, Vc(max). As a result of increasing VPDL, g(s) decreased. Elevated [CO2] resulted in more pronounced midday decline in Pn compared to ambient concentrations. Moreover, this decline was more pronounced under combined treatment compared to elevated CO2 treatment. The positive impact of CO2 on Pn was relatively more pronounced in days with environmental stress but relatively less pronounced during midday depression. The negative impact of ozone tended to decrease in both cases. (C) 2009 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据