Hannu Hökkä , Timo Penttilä

Sekakoivikon reaktio ensiharvennukseen mustikkaturvekankaalla Lapissa

Hökkä H., Penttilä T. Sekakoivikon reaktio ensiharvennukseen mustikkaturvekankaalla Lapissa.

Tiivistelmä

The five-year response of a birch-dominated mixed stand (80% Betula pubescens, 14% Betula pendula) to thinning was studied in a thinning experiment in a mesotrophic, shallow-peated site in Ylitornio, northern Finland. Four thinning intensities (0%, 47%, 57% and 71 % removal of the initial stem number, i.e. 0%, 17%, 27% and 52% removal of the initial basal area), with three replications, were arranged in a randomized block design. At the time of thinning, the stand age was 30 a, and the dominant height was 11.5 m. Light (15%) and normal (27%) thinning decreased the rates of stand-level basal area growth by 12 and 15%, respectively. Thinning resulted in a significant increase in the growth of mean height and a subsequent increase in volume growth in the normally-thinned plots. Following heavy thinning, the volume and basal area growth rates were 35% and 32% less than those in the control treatment. The relative basal area increment, as well as the increase in mean diameter, was at its maximum in the heavily-thinned plots. Keywords: Betula pubescens, forest drainage, growth, thinning

Avainsanat
forest drainage; growth; thinning; Betula pubescens

Vastaanotettu 31.10.2017 Julkaistu 1.1.1995

Katselukerrat 548

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