Abstract

 Response of Pinus silvestris L. on thermal impact at ground fire has been studied. Stem respiration subject to vital status of pine trees was determined in situ in pine stands of Nijnee Priangarie in July-August. Stem respiration rate before and after ignition have been revealed. In most cases stem respiration rate of different vital tree status reliably differed before and after fire. Statistical analysis showed that before fire, average stem respiration rate of healthy trees was 1.5-1.6 times higher than that of weakened or highly weakened trees. In addition, there were no differences in stem respiration found between weakened or highly weakened trees. On the next day after ground fire, decreasing of stem respiration rate of healthy and highly weakened trees was observed whereas stem respiration rate of weakened trees was increasing.

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