Respiration of the growing shoots of Scots pine |
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Authors: | V F Zabuga G A Zabuga |
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Institution: | (1) Angarsk State Technical Academy, The Federal Education Agency of Russian Federation, ul. Tchaikovskogo 60, Angarsk, Irkutsk oblast, 665830, Russia |
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Abstract: | The respiratory CO2 exchange and the growth of the annual shoots were followed in Scots pine (Pinus sylvestris L.) trees growing under extreme continental forest-steppe conditions near the lake Baikal. The temperature coefficient of dark respiration (Q10) in growing shoots dropped down from 3.2–4.0 (in the temperature range of 10–20°C) to 1.5–2.0 (in the temperature range of 20–30°C). The changes in averaged daily respiration rates correlated with the changes in shoot growth increments and temperature (with the multiple determination coefficient of 0.94). Growth respiration of the axial shoots during the phenophase reached 80% of the total respiration costs, with the coefficients of growth respiration and maintenance respiration 0.32 and 0.021. In young crown shoots, the average value of CO2 evolution in the light combined for the whole observation period (years 1976–2004) was about 1 kg/dm2, that is 9% of CO2 evolution from the trunk surface. |
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Keywords: | Pinus sylvestris growing shoot growth respiration expenditure total CO2 evolution |
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