Europski ariš (Larix decidua Mill.) pokazao je vrlo dobar rast i prilagodljivost ekološkim uvjetima u Bosni i Hercegovini. Cilj istraživanja je utvrditi varijabilnost morfoloških svojstava ariša na pokusnoj površini kod Kaknja, te varijabilnosti u početku osržavanja, kao i postojanje korelacija između ovih svojstava.
U sjemenskoj sastojini ariša, osnovanoj sadnicama starosti 2+0 1979. godine, napravljena je trajna pokusna površina od 0,45 hektara i na njoj mjerene su visine i promjeri stabala 2002. i 2020. godine, te izračunate temeljnica i volumen. Stabla su 2020. godine bušena na prsnoj visini Preslerovim svrdlom kako bi se odredio udio osrženosti. Izračunate su prosječne vrijednosti svih svojstava. Zatim je odabrano po deset, pet i jedno najbolje stablo po svojstvima promjera, visine, temeljnice, volumena i izračunate razlike između prosječnih vrijednosti za deset stabala i ukupnog prosjeka, prosjeka za pet stabala i ukupnog prosjeka, te razlike između maksimalnih i prosječnih vrijednosti za istraživana svojstva. Također je izračunavat Pearsonov koeficijent korelacije između svih istraživanih svojstava.
Prosječan promjer stabala starih 41 godinu bio je 24,6 cm, prosječna visina 21,8 m. Rezultati istraživanja osrženosti su pokazali da ariš prosječno počinje osržavati pri starosti od 14 godina. Pearsonov koeficijent korelacije za 2020. godinu pokazuje da postoji negativna korelacija između početka osržavanja prema svim ostalim svojstvima, odnosno stabla koja ranije osržavaju imaju veće vrijednosti svojstava rasta.
Rezultati će biti korišteni u procesima individualne selekcije ariša sa dobrim visinskim i debljinskim prirastom i ranim osržavanjem.Larch (Larix decidua) showed good growth and adaptability to ecological conditions in Bosnia and Herzegovina. The research aims to determine the variability of the morphological traits of larch in the seed stand near Kakanj, the variability at the beginning of heartwood formation, and correlations among these properties.
In the larch seed stand, established by seedlings 2+0 in 1979, an area of 0,45 hectares was set aside. The heights and breast height diameters of the trees were on that area were measured in 2002 and 2020, and the basal area and volume were calculated. In 2020, the trees were drilled at breast height with a Presler drill to measure the proportion of heartwood. Average values of all properties for 2002 and 2020 were calculated. The ten, five and one best trees were selected according to the properties of breast height diameter, height, basal area, volume, and the intensities of selection for these traits were calculated. The Pearson correlation coefficient among all investigated traits were calculated.
The average breast height diameter of 41-year-old trees was 24,6 cm, average height 21,8 m, basal area 0.0499m2 and volume 0.3745 m3 (table 1), while in 2002. the average breast height diameter was 15,5 cm, height 18,2 m, basal area 0,020 m2, and volume 0,128 m3 (table 1). Between 2002 and 2020, there was an overtaking of trees in breast height diameter and height and thus the base and volume (table 2). The average larch tree starts heartwood formation at the age of 14 years (table 1). The earliest heartwood formation occurs in the sixth year (tree 495) and the latest in the 32nd year (table 4). Pearson coefficient showed a high positive correlation between breast height diameter and height in 2002 (table 9), which means that trees with a good height increase also have a good thickness increase. As a result, the correlation between breast height diameter and basal area and breast height diameter and volume, height and basal area, height and volume, and basal area and volume are statistically significant. Pearson\u27s correlation coefficient for the year 2020 showed a negative correlation between the beginning of heartwood formation and all other traits (table 10), i.e., trees that formed heartwood earlier have higher values of growth traits.
The results will be used in the selection processes of larch individuals with good height and thickness growth and early heartwood formation
