Spruce Fir Photosynthesis in the Forest Ecosystems of the Log Tayezhnyi Test Area

摘要

Seasonal dynamics of net-photosynthesis rate and dark respiration rate in the fir spruce (Picea abies) were investigated in order to indicate environmental exposure and to estimate photosynthesis in tlr spruce stand. No intraseasonal depression of photosynthesis was found. A link was detected between maximum values of photosynthesis rate and air temperature: seasonal maximum of net-photosynthesis in fir spruce appeared in July at a temperature of approximately 20°C; reduction of C02 assimilation wasobserved during temperature optimum decrease in August and September. Positive carbon dioxide balance indicates that old-growth spruce fir stand in forest ecosystems at the Log Tayezhnyi test area is a carbon reservoir.