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- W2247332060 abstract "A system of air-cooled assimilation chambers was developed for continuous measurement of gas exchange in a 20-year-old stand of Scots pine. The period of net photosynthetic activity was approxi mately eight months a year, starting in April as soon as the soil was no longer frozen. Photosynthesis stopped in December largely because of low irradiance and air temperature. Calculation of the mesophyll conductance for carbon dioxide showed that it took more than two months of the growing season to repair winter damage to the photosynthetic apparatus. Needle age had a much more pronounced effect on photosynthetic efficiency and performance than had the position of needles within the crown. The variation between trees was small, and smaller for photosynthesis than for transpiration. Stem and branch measured in situ exhibited large seasonal variation. The pronouncedly increased rate of during the period was probably caused by growth respiration plus an adaptation to temperature of the maintenance respiration. In light, stem and branch decreased as a result of the refixation of carbon dioxide in the chlorophyll-containing tissue im mediately beneath the thin periderm. Additional keywords: Fertilization, irrigation, mesophyll conductance, respiration, stomatal con ductance. Background One of the main aims of the Swedish Coniferous Forest Project (SWECON) was the construction of simulation models for prediction of the primary production of a forest dominated by Scots pine (Pinus sylvestris L.). To achieve this a better understanding of the processes and factors regulating was needed. Photo synthesis and are key processes for the understanding and description of the dynamics of primary production in an ecosystem and, consequently, a study of the gas exchange of Scots pine was carried out as an integrated part of the project." @default.
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- W2247332060 date "1980-01-01" @default.
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- W2247332060 title "Photosynthesis and transpiration in 20-year-old Scots pine." @default.
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