Department of Crop Production Ecology, Swedish University of Agricultural Sciences, Uppsala

Plants are able to adjust their physiological activity to fluctuations and long-term changes in their growing environment. Nevertheless, projected increases in temperature will occur with unprecedented speed. Will global warming exceed the acclimation capacity of leaves, thus reducing net CO2 assimilation? Such a reduction in net CO2 assimilation rate (Anet) in response to warming may lower ecosystems’ net primary productivity, with global impacts on the carbon cycling. Here we combine data on net photosynthetic thermal acclimation to short- and long-term changes in temperature with a probabilistic description of leaf temperature variability. We study the effects of mean leaf temperature and its variability on average Anet and the frequency of occurrence of sub-optimal thermal conditions and how acclimation capacity may affect them.   


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