DIGITALNA ARHIVA ŠUMARSKOG LISTA
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| ŠUMARSKI LIST 3-4/1957 str. 44 <-- 44 --> PDF |
SUMMARY In this (paper the thickness of bark of our most important oaks in Croatia i. e. Quercus pedunculata, Ehrh. and Quercus sessiliflora, Sm. is dealt with. iThe bark thickness at ibreast height was measured with the Swedish bark gauge (See FSg. U). A large number of observations was mađe i. e. 8.400 on Quercus pedunculata and 4.415 on Quercus sessiliflora. The data collected were grouped according to the diiameter oulside bark (D), and the average value of bark thicknesa tor each of the 6 — cm. classes (r) was computed (See Tables 4 and 5). : In applying the method of least lsquares the tfollowing results were obtained: 1. The average double bark thickness (r) at breast height is expressed by the equations of the straight lines: a) Q u e r c u s pedunculata (The Slavonian average) rr = 0,066231 D + 0,498366 (1) b) Quercus pedunculata IfThe average of Liipovljani district) r n = 0,052326 D + 0,853898 (2) c) Q u e r c u ,s sessiliflora /(The (Slavonian average) *HI - 0,048777 D + 1,179431 (3) 2. The relationship foetween the diameter outside bark (D) anđ the diarneter inside bark (d) V/as ifouod to be as follows: Quercus pedunculata -- + o = 1,0864 ~- 0,0012 Ouercus sessiliflora ---± a = 1,0818 + 0,0016 These relations are useful for the determination of the diameter increment in terms of diameter autside bark as well as for the determination of volume increment In order to obtain the diameter increment including bark increment it is only necesary to multiply the coefficient » l" d l w^^ diameter increment inside bark. d 3. The« relationship -~- ± 0 as to the fbelow mentioned tepeicies was found to a) Quercus ipedunculata 0,9204 + 0,0012 b) Quercus sessiliflora 0,9243 + 0,0015 d 4. The ratio-p.- varies along( the whole length of the stem. That is the treason be as follows: why the M e y e r´s formula |P = |´ ~ ~fv l´^°I [4-LH for the bark volume in Vo. |