The net exchange of CO 2 (NEE) between a Scots pine ( Pinus sylvestris L.) forest ecosystem in eastern Finland and the atmosphere was measured continuously by the eddy covariance (EC) technique over 4 years (1999–2002). The annual temperature coefficient ( Q 10 ) of ecosystem respiration ( R ) for these years, respectively, was 2.32, 2.66, 2.73 and 2.69. The light‐saturated rate of photosynthesis ( A max ) was highest in July...