DIGITALNA ARHIVA ŠUMARSKOG LISTA
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ŠUMARSKI LIST 5-7/1981 str. 20 <-- 20 --> PDF |
height growth dynamics an 10 young trees out of every species. The average height of trees varied from 1,0 m to 1,5 m. The measurements were performed every 10 days. There is also the meteorological station in the nursery in which we regulary observed the meteorological conditions. In this three year period the climate was generally colder and more humid than previous yearly averages. The following were observed: Norway Spruce starts its height growth at the beginning of the first third of May and ends at the beginning of the second third of July. The most intensive height growth is during the third decade of May and the first decade of June. In May, 50.2% lenght of the annual hight growth is realized. 47.3°/» in June and 2.5% in July. The duration of the height growth is 72 days. Omorica Spruce starts its height growth at the beginning of the first or of the second third of May and ends at the third decade in June or at the end of the first third in July. The greatest height growth is at the end of the third decade of May and at the first third of June. In May, 50.8% of the annual height growth is realized, 47.9% in June and 1.5% in July. The duration of the height growth is either 62 or 51 days. Sitka Spruce starts its height growth at the beginning of the first or second third in May, and ends at the end of the third decade in June. The greatest height growth is at the end of May and at the beginning of June. In May, 63.5% length of the annual height growth is realized, 35.9% in June and 0.6% in July. The duration of the height growth is 62 days. »Jedan od najznačajnijih proizvodno-pokusnih objekata osnovan je 1970. na području Šumarije Skrad u šumskog predjelu Rogi, kota 705 m n. v. Tlo je kiselo smeđe na permokarbonskim škriljevcima, a njegova fiziološki aktivna dubina dosiže 50—100 cm. Površina je obrasla bukovom panjačom s pojedinačnim stablima breze razasutim po cijeloj površini. Nakon izvršene sječe osnovan je komparativni pokus sa šest vrsta četinjača...« Od svake vrste posađeno je 121 biljaka. Deset godina kasnije tj. 1979. god. pojedine vrste postigle su ove dimenzije (prva brojka visina u m, druga broj stabala na kojima je mjeren prsni promjer u mm — treća brojka): obična smreka 1,48/117/15,2 — sitkanskä smreka (P. sithensis) 1,991101/22,7; 2,66/90/33; 1,35/110/10,4 — obična jela 0,97/114/8,0 — golema jela (A. grandis) 1,72/119/19,6 — golema tuja (Thuia plicata) 2,56/93/25,5 i zelena duglazija (Pseudotsuga menziensii) 5,701 116/83,9. (Iz knjige »šumsko gospodarstvo Delnice 1960—1980«, str. 187/188) |