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Aarne Nyyssönen (email)

Vertailevia havaintoja hoidettujen ja luonnontilaisten männiköiden rakenteesta ja kehityksestä

Nyyssönen A. (1950). Vertailevia havaintoja hoidettujen ja luonnontilaisten männiköiden rakenteesta ja kehityksestä. Silva Fennica no. 68 article id 4600. https://doi.org/10.14214/sf.a9091

English title: Comparative study on structure and development of managed and natural Scots pine stands

Abstract

The Forest Research Institute of Finland has established permanent sample plots to survey the effect of thinnings on the stands. This study compares the development of tended and natural Scots pine (Pinus sylvestris L.) stands growing on three different forest types: Oxalis-Myrtillus, Vaccinium and Calluna site type. The effect of heavy thinning from below (Oxalis-Myrtillus and Vaccinium site types) and increment felling (Calluna site type) was assessed by dividing the trees of the stands in tree classification classes according to their crown storey and defects.

The results show that thinning from below and increment thinning increase the proportion of trees in the 1st crown storey, which is already large in the natural stands. Also the diameter distribution is more even and the mean diameter higher after the thinnings.

In Scots pine stands in natural state, volume increment per stem is highest in the 1st crown storey and diminishes strongly towards the lower crown storeys. Thinnings increased the increment. The study indicates that many of the objectives of the intermediate cuttings, including promoting the growth of the best trees and improving the quality of the stand, have in general been achieved. Consequently, the thinnings give means to achieve the most valuable yield in the stand.

The article includes a summary in English.

Original keywords
hakkuut; mänty; Pinus sylvestris; harvennushakkuu; kasvupaikkatyyppi; harvennus; luonnometsä; alaharvennus; läpimitan kasvu; tilavuuskasvu; latvuskerros

English keywords
natural forest; Scots pine; thinnings; diameter growth; fellings; increment; thinning from below; forest type; crown storey; tree classification

Published in 1950

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Available at https://doi.org/10.14214/sf.a9091 | Download PDF

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