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- W33805930 abstract "During winter and early spring, evergreen boreal conifers are severely stressed because light energy cannot be used when photosynthesis is pre-empted by low ambient temperatures. As a result of global warming, the growing season for boreal forest trees will increase, thereby altering the carbon sink of conifer forests. Some of these forests might also be negatively affected by increased land surface air temperatures, due to e.g. the disruption of regulatory processes and hence an incomplete exploitation of the increased length of the growing season. To isolate the effect of temperature from the cellular to the ecosystem level, we studied the dynamics of photosynthesis under boreal climate conditions in the field as well as in controlled experiments in phytotrons. While photosynthesis of many species responds positively to temperature, recent findings in pine suggest that photoperiod control of autumn dormancy appears to negate any potential for an increased carbon gain associated with higher temperatures during the autumn season. By contrast, the onset of CO2 assimilation in spring is clearly triggered by increasing air temperatures; however, low soil temperatures and intermittent frost can decrease the rate of the recovery of photosynthesis. We conclude that adaptation of photosynthesis to varying temperatures revolves around the trade-off between utilizing the full growing season and minimizing damage (frost, oxidative stress) through proper timing of hardening in autumn and dehardening in spring." @default.
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- W33805930 date "2009-01-01" @default.
- W33805930 modified "2023-09-26" @default.
- W33805930 title "Conifer cold hardiness, climate change and the likely effects of warmer temperatures on photosynthesis." @default.
- W33805930 doi "https://doi.org/10.1079/9781845935139.0249" @default.
- W33805930 hasPublicationYear "2009" @default.
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