Markku Saarinen

Neulasten pääravinnepitoisuuksien muutokset turvekankaan alikasvoskuusikossa ylispuuhakkuun jälkeen

Saarinen M. Neulasten pääravinnepitoisuuksien muutokset turvekankaan alikasvoskuusikossa ylispuuhakkuun jälkeen.

Tiivistelmä

Abstract: The foliar chemical composition of a Norway spruce underwood were analysed one year before and in three years after the removal of a downy birch (Betula pubescens Ehrh.) shelterwood on an old drainage area. The most remarkable change due to the release was considered to be the significant decrease in the potassium concentrations. The nitrogen concentrations increased very strongly, and phosphorus increased slightly but not significantly during the first growth period after the release, decreasing later to a level approaching the deficiency limit. Consequently the nutrient balance between N and K was strongly shaken by the increased N/K-ratio. One reason for that might be the increased use of K in the growing points of roots after the root competition of shelterwood was eliminated. Key words: foliar analysis, nutrients, peatlands, Picea abies, shelterwood, underwood.

Avainsanat
peatlands; Picea abies; foliar analysis; nutrients; shelterwood; underwood

Vastaanotettu 31.10.2017 Julkaistu 1.1.1996

Katselukerrat 1136

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