The caloric value of stem of silver birch (Betula pendula Roth.), downy birch (Betula pubescens Ehrh.), black alder (Alnus glutinosa (L.) Gaertn.) and aspen (Populus tremula L.) in Estonia
2000
Lohmus, K. (University of Tartu, Tartu (Estonia). Inst. of Geography) | Ivask, M. | Tamm, Ue. | Vares, A. | Tamm, U. (Estonian Agricultural Univ., Tartu (Estonia). Forest Research Inst.)
The aims of this study were (i) to estimate the caloric values of the stemwood and stembark of silver birch (Betula pendula Roth.), downy birch (Betula pubescens Ehrh.), black alder (Alnus glutinosa (L.) Gaertn.) and aspen (Populus tremula L.) in Estonia, (ii) to analyse the variability of caloric value of stemwood and stembark depending on tree species, social position of tree in the stand, and vertical location of the sample in stem. To characterize the caloricity of stemwood and stembark the caloric values were measured. The results demonstrated statistically significantly higher mean caloric values of stembark compared with stemwood for all investigated species. Social status of tree and relative height of the sample had no significant effect on the caloricity of stemwood or stembark
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