DIGITALNA ARHIVA ŠUMARSKOG LISTA
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| ŠUMARSKI LIST 9-10/2023 str. 44 <-- 44 --> PDF |
achieved with the aforementioned instruments on the living trees. According to Kaufmann (2001), the function with a diameter at 7 meters height gives more accurate estimates of volume than the function with a diameter at breast height and tree height, even when the diameter at 7 meters is measured with a larger random error than diameter at breast height. According to Johansson (2005), to estimate the volume of grey alder (Alnus incana (L.) Moench.) and common alder (Alnus glutinosa (L.) Gaertn.) in Sweden, functions including diameter and height and functions including diameter, height and height of the crown base were tested. The analysis showed that no model including the height of the crown base improved the estimation of grey alder tree volume, while the estimation accuracy increased for common alder. The result with grey alder is explained by the fact that the stands were not thinned, which resulted in a reduction in the crown length. As already mentioned, in the territory of Bosnia and Herzegovina, the oak forests do not have adequate management adapted to the ecological requirements and biological properties of this type of tree, which is reflected in the form of the crown, that is, the dependence of the volume of the tree on the height of the tree crown base. As a consequence, the introduction of the crown base |