DIGITALNA ARHIVA ŠUMARSKOG LISTA
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ŠUMARSKI LIST 9-10/2011 str. 28 <-- 28 --> PDF |
V. Račko, M. Saniga, I. Čunderlík: THE IMPACT OF SILVICULTURALTREATMENTS ON THE STRUCTURE ...Šumarski list br. 9–10, CXXXV (2011), 437-448 tistically significant, but average values in both obser-sume that considering higher age of the trees from ved CMTs were considerably low (Table 4).CMT513 (109.7 years) the portion of DZ compared to the CMT514b (97.7 years)should be higher.But the From the viewpoint of the size of created zone of results present an opposite trend. (Table 2, Table 4). DZexpressed by its diameter proportionwe can as Table4 T-tests of mean values of DZ portion (%) and RH portion (%) for investigated CMTs Tablica 4.T-test srednjih vrijednosti postotnog udjela piravosti (DZ) i neprave srži (RH) na istraživanim plohama (CMTs) CMT–OdjeliDZ portion –DZ udjelp-value –p vrijednostRH portion –RH udjelp-value –p vrijednost 513 514b 19.4±6.67 23.9±6.49 0.0097** 11.7±3.76 10.3±3.96 0.5806ns Within the same column (mean ± SD).Student´s t-test(p-value – level of statistical significance, *p < 0.05, **p < 0.01, ***p < 0.001, ns (not statistically significant, p > 0.05). U istoj koloni dane su srednje vrijednosti i standardna devijacija. Student-ov t-test (p-vrijednost – stupanj statistički značajne razlike – ns nije statistički značeno). Table 5 Linear regression dependences between DZ or SWwidth (cm) and CA(year) or H in trunk (m) for investigated CMTs. Tablica 5.Linearna regresija ovisnosti širine piravosti, odnosno bijelji (SW) izražena u cm s kambialnom starosti debla (CA) (godina) ili visinom debla (H) za istraživane plohe (CMTs) Dependency –Ovisnost y= a + b.x CMT–Odjeli 513CMT–Odjeli 514b yxabRp-value p vrijednost abRp-value p vrijednost DZ width × CAin trunk DZ širina × CA debla-3.5710.11930.63520.0000***-0.1640.1050.57940.0015** DZ width × H in trunk DZ širina × H debla9.702-0.2790.57360.0005***10.746-0.3320.61080.0007*** SWwidth × CAin trunk SW širina × CA debla9.7770.2210.59420.0002***3.7820.2810.69620.0000*** SWwidth × H in trunk SW širina × H debla35.145-0.6120.63670.0000***31.728-0.6890.56650.0020** H –height in trunk (m) from bottom of tree; a – absolute coefficient, b – regression coefficient, R – correlation coefficient, p-value – level of statistical significance correlation coeficient *p < 0.05, **p < 0.01, ***p < 0.001, ns (not statistically signi ficant, p > 0.05), y – dependent variable,×– independent variable H –visina debla (m); a – apsolutni koeficijent, b – regresijski koeficijent, R – korelacijski koficijent, p-vrijednost – stupanj statistički značajne razlike korelacijskog koeficijenta *p < 0.05, **p < 0.01, ***p < 0.001, ns (nije statistički značajno, p > 0.05), y – zavisna varijabla,×– nezavisna varijabla Table 6 Theverticaldistribution and position oftheRH in Between the width of DZ or SWand CAof a trunk trunk. RHL(m) means RH length at the specified there were found increasing linear regression depenposition in trunk. dences with relatively high correlation coefficients Tablica 6.Vertikalno rasprostiranje neprave srži (RH) u (Table 5).The given fact points out at the relatively deblu stabla. RHL (m) označava visinu do koje se strong influence of age on DZ and SWformation. rasprostire neprava srž (RH) CMT Odjeli Tree Stablo No. RHL Visina do koje se rasprostire neprava srž 5131540 - 5 513856 – 8 and 23 – 24 514b420 – 2 514b30 – 5 514b370 – 7 and 14 – 16 514b151 – 6 514b338 – 11 Table 6 presents distribution and position of RH along the trunk length. It can be clearly seen that RH in most trees in both forest stands occurs in 0-8m distance from the butt.Therefore, the wound, which was a cause of such RH formation, occurred at tree butts and was caused by a wound of butt parts. For the sample trees No. 85 (CMT513) and No. 33 and 37 (CMT514b) the wound was caused by dieback of thick branches of yet standing trees in the lower parts of the crowns. |