期刊
NEW PHYTOLOGIST
卷 196, 期 2, 页码 448-461出版社
WILEY-BLACKWELL
DOI: 10.1111/j.1469-8137.2012.04267.x
关键词
climate change; elevated CO2 and temperature; fluorescence; heat wave; photosynthesis; Pinus taeda (loblolly pine); Quercus rubra (northern red oak); seedling survival
资金
- CWO, Faculty of Bioscience Engineering, Belgium
- United States Department of Energy NICCR Program [07-SC-NICCR-1060]
Here, we investigated the effect of different heat-wave intensities applied at two atmospheric CO2 concentrations ([CO2]) on seedlings of two tree species, loblolly pine (Pinus taeda) and northern red oak (Quercus rubra). Seedlings were assigned to treatment combinations of two levels of [CO2] (380 or 700 mu mol mol-1) and four levels of air temperature (ambient, ambient +3 degrees C, or 7-d heat waves consisting of a biweekly +6 degrees C heat wave, or a monthly +12 degrees C heat wave). Treatments were maintained throughout the growing season, thus receiving equal heat sums. We measured gas exchange and fluorescence parameters before, during and after a mid-summer heat wave. The +12 degrees C heat wave, significantly reduced net photosynthesis (Anet) in both species and [CO2] treatments but this effect was diminished in elevated [CO2]. The decrease in Anet was accompanied by a decrease in Fv'/Fm' in P. taeda and FPSII in Q. rubra. Our findings suggest that, if soil moisture is adequate, trees will experience negative effects in photosynthetic performance only with the occurrence of extreme heat waves. As elevated [CO2] diminished these negative effects, the future climate may not be as detrimental to plant communities as previously assumed.
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