期刊
ENVIRONMENTAL AND EXPERIMENTAL BOTANY
卷 158, 期 -, 页码 28-39出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.envexpbot.2018.10.030
关键词
Photosynthesis; Climate change; Factorial experiment; Tropical forest; Warming; Carbon dioxide; Leaf temperature; Vcmax; J(max); Temperature optima; Open top chamber; Photosynthetic capacity
资金
- Natural Environment Research Council/NERC [NE/K01644X/1, NE/N012542/1]
- State of San Paulo Research Foundation/FAPESP [2012/51509-8, 2012/51872-5]
- European Research Council
- NERC [NE/S011811/1, NE/N004655/1, NE/N012542/1, NE/K01644X/1] Funding Source: UKRI
- Natural Environment Research Council [NE/K01644X/1, NE/N012542/1] Funding Source: researchfish
Factorial experiments of combined warming and elevated CO2 are rarely performed but essential for our understanding of plant physiological responses to climate change. Studies of tropical species are particularly lacking, hence we grew juvenile trees of Alchornea glandulosa under conditions of elevated temperature (+ 1.5 degrees C, eT) and elevated CO2 (+400ppm, eC) in a factorial open top chamber experiment. We addressed three questions: i) To what extent does stomatal conductance (g(s)) reduce with eT and eC treatments?; ii) Is there an interactive effect of eT and eC on g(s)?; iii) Does reduced g(s) as a result of eT and/or eC cause an increase in leaf temperature?; iv) Do the photosynthetic temperature optima (T-opt) and temperature response of photosynthetic capacities (V-cmax, J(max)) shift with higher growth temperatures? The experiment was performed during an anomalously hot period, including a heatwave during the acclimation period. Our key findings are that: 1) the eT treatment reduced g(s) more than the eC treatment, 2) reduced g(s) caused an increase in leaf temperatures, and 3) net photosynthesis and photosynthetic capacities showed very high temperature tolerances with no evidence for acclimation to the eT treatment. Our results suggest that A. glandulosa may be able to cope with increases in air temperatures, however reductions in g(s), may cause higher leaf temperatures beyond those induced by an air temperature rise over the coming century.
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