Decrease of CO2 exchange in Scots pine after naturally occurring or artificial low temperatures

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Abstract
A decrease in the net photosynthetic rate was recorded using an infrared gas analyzer after subjecting pine seedlings to naturally occurring or artificial low temperature pulses in field and laboratory experiments. Mathematical models were developed to quantify the depression in CO2 exchange observed when autumn measurements taken in the field were analyzed. A model which included a mathematically determined additional parameter gave values more closely correlated with CO2 exchange at the end of the measuring period better than one which included only temperature and light as independent variables. This modelling approach was similar to one used earlier to quantify the effect of water stress on photosynthesis. The same kind of effect was found in a laboratory experiment after artificial low temperatures, as shown in this paper.

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