DIGITALNA ARHIVA ŠUMARSKOG LISTA
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ŠUMARSKI LIST 1-2/1961 str. 36 <-- 36 --> PDF |
7. H o r v a t I.. Prilog poznavanju nekih fizičkih i mehaničkih svojstava crne johovine, Š. L. 1960, str. 173—289. 8. Glav a č M., Crna joha u Posavskoj i Podravskoj Hrvatskoj s ekološkog, biološkog i šumsko-uzgojnog gledišta (disertacija — rukopis), Zagreb 1960. SUMMARY Taking in account the results of the investigation it is possible to lay out following conclusions about the rate and the distribution of the reddisch-brown heartwood in the stem of Black Alder (A. Glutinosa): 1) Diameter of the heartwood increases from the stamp to the top of the stem till about between 5 and 7 meters above the ground. From this point in the direction to the top of the stem it decreases. 2) The rate of the heartwood also increases from the stamp to the tree top till the height of about 9 meters above the ground, where it reaches nearly 84 percent of the diameter of the stem. The curve in the fig. no 5, which represents the relation between the height of the cross-section of the stem and percentage of the heartwood in the diameter of the stem shows a positive and quite high correlation r = 0.720 ± 0.0337 3) The width of the sapwood is not constant in the longitudinal direction of the stem. The widthest sapwood is on the stamp, and decreases till the height of the 9 meters above the ground, where narrowest sapwood has about 1.7 centimeters (about 3/4 of the inch). From this point to the top of the stem it increases. The width of the sapwood, in longitudinal direction from the stamp to the top of the stem, is possible to show with the curve in fig. 5. The correletion is positive and quite high and is r = 0.837 ± 0.0205 4) The number of the annual rings of the heartwood in the longitudinal direction from the stamp to the top of the stem shows quite similar alterations to those of the diameter of heartwood. It increases till the height of about 7 meters above the ground, and from this point to the top of the stem it decreases (Sec. table No. 5. and fig, No. 6). 5) The rate of the number of annual rings of heartwood incresases from the stamp till the height of the 8 meters above the ground, where it reaches its maximum (See fig. No. 6). The correlation is positive and expressed with r = 0.678 ± 0.0323 6) The number of the annual rings of the sapwood decreases from the stamp to the height of about 9 meters above the gronud, and the average lowest number of annual rings of sapwood is tvelwe. From this height to the top it increasses (See table No. 3 and fig. No. 6). The correlation between the height of the cross-section of stem above the ground and the number of the annual rings of sapwood is positiv and is high r = 0.785 ± 0.0270 7) The area of heariwood on the cross-section of stem increases in the longitudinal direction from stamp to the top of the stem till about 5 meters above the ground or to one fith of the height of tree (See fig. No. 7 and table No. 4). From this height to the top of the stem it decreases and it stops in the height of about 24 meters above the ground. 8) The rate of the heartwood area on the cross-section of stem increases from the stamp to the height of 9 meters above the ground, where it reaches its highest value with about 70 percent of the area of the cross-section. 34 |