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Temperature Regime of a Scots Pine in a Climate of Arkhangelsk. P. 73–79

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Section: Biology




Tyukavina Ol'ga Nikolaevna
Institute of Natural Sciences and Technology, Northern (Arctic) Federal University named after M.V. Lomonosov


All living organisms are in a state of continuous heat exchange with the environment. They emit the infrared radiation, which transfers a huge amount of information not available to the majority of living organisms. IR methods are widely used to assess the state of the organisms. The pine temperature was measured by the infrared camera. All investigations were carried out in the urban plantings of Scots pine. The trunks temperature simultaneously changes with the ambient temperature, but not identical with it. Low trunk temperature in the preparatory period of the vegetation development is a defense mechanism against the anticipatory physiological activity. During a biochemical alteration process and apparent growth preparation a tree is protected from possible short-time negative temperatures by rising the trunk temperature. The branches temperature is lower than the trunk temperature. The heat accumulation in the pine branches is behind compared with the trunk. The needle temperature in April, May and June is lower than the trunk temperature. In July and October the temperatures of needle and a trunk are equal. Deviation of the needle temperature from the trunk temperature depends on the light intensity and air humidity. This fact is indicative of the evapotranspiration rate influence. As the needle temperatures keep in step with a seasonal trend of pine evapotranspiration the difference in temperatures of the needle and a trunk is an indicator of the physiological activity of a tree. The needle and trunk temperature equalization indicates the finalization of intensive growth processes at the vegetation period. Thus, lR imaging allows establishing the physiological activity of a tree.


trunk temperature, needle temperature, branches temperature, infrared camera, Scots pine
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