CO2 Efflux from the Stem Surface of Scots Pine under Various Growing Conditions

Evaluating temporal variability of CO 2 efflux from the tree trunks of Scots pine ( Pinus sylvestris L.) are presented. The field measurements were performed by the chamber method in a swampy cotton grassy–sphagnum pine forest in Yaroslavl region and in a highly productive grassy–bilberry pine forest on well drained sandy soils in the Serebryaniy Bor forest service area in Moscow region. Tree trunk respiration was measured during several growing seasons under different weather conditions and groundwater level depths. The results showed that the CO 2 emission of living tree trunks in the southern European taiga forests exhibited clear seasonal and diurnal variation and it was a highly sensitive to changing ambient conditions (air temperature and groundwater level). The differences in the trunk respiration rate of trees of various growth classes for a swampy pine forest were also revealed.