Photosynthetic activities of common spruce (Picea abies (L.) Karst.) and Dahurian larch (Larix gmelinii (Rupr) Rupr ex Kuzen) were analyzed on the basis of datasets obtained for 110- to 130-year-old forest stands in Middle Russia and East Siberia. Using a Li-Cor 6200 gas analyzer, photosynthesis was measured in parallel with transpiration, stomatal conductance, CO2 concentrations in ambient air and intercellular spaces, the photosynthetically active radiation, air temperature, and air humidity. The data were examined within the framework of a biochemical model of photosynthesis of Farquhar et al.  in combination with the stomatal conductance model proposed by Jarvis . The species-specific differences in carbon assimilation rates were discovered, and dependences of photosynthesis on the needle age, light regime, and growth conditions were revealed. The model parameters obtained were used to simulate the photosynthetic rates in spruce and larch trees at various weather conditions.
Russian Journal of Plant Physiology – Springer Journals
Published: Oct 18, 2004
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