DIGITALNA ARHIVA ŠUMARSKOG LISTA
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ŠUMARSKI LIST 7-8/2006 str. 39 <-- 39 --> PDF |
M. Prka: ZNAČAJKE DOZNAČENIH BUKOVIH STABALA PO VRSTI SIJEKA U SJEĆINAMA ... Šumarski list br. 7-8, CXXX (2006), 319-329 fying of exploitation of forests at the time of seedingfelling. However, as much as 23.3 % of damaged trees out of the assigned trees of final felling, i.e. al most one quarter of more or less damaged trees left for final felling, is the information which calls for some concern. The quality of assortment structure of stand varies within a large scope and depends on different kinds of influence, from timely and high-quality cultivation activities, over influence of habitats, to the extreme abiotic influences of accidental character. Assortment structure of beech stands is the focus of our interest only in the sense of increasing the overall quality of beech trees, i.e. achieving the largest possible percentage of high-quality beech trees in the stand. The percentage of timber assortments in beech stands of particular age (except for final felling and clear felling) is not our primary interest. The primary interest of forestry operational bodies (as well as science) is the quality and quantity of timber assortments that can be achieved through carrying out of particular type offelling, i.e. assortment structure of felling area. The share of timber assortments of particular type of felling is to a great extent a result of our decisions during the selection of trees for felling, by which we pursue the aim and the guidelines of stand management. The principles (rules) we apply while assigning trees for particular type of felling lead us to “save ” the high-quality trees for the end of the rotation (seedingfelling, final felling). Having that in mind, it is to be expected that the percentage of the timber assortments of the highest quality (within the same diameter class) will increase from thinning felling towards final felling. For that reason it is necessary to distinguish between the assortment structure of stand and the assortment structure of felling area (specific types offelling). The assortment structure of stand varies within a wide and unknown scope, and its quality is the result of the success of our management in the past. Only in that sense does the assortment structure of stand influence the assortment structure of felling area. The increase in percentage shares of high-quality timber assortments according to diameter classes from thinning felling tofinal felling is a pattern determined by our decisions, i.e. expert conduct of cultivation activities ofassigning trees for felling. This pattern is constant in the same measure as the principles of management and the manner of their implementation are constant anage ent and the anner of their i ple entation are constant. Key words: beech felling areas, assortment structure, tree damages |