Effects of overstory tree density, site preparation, and ground vegetation on natural Scots pine seedling emergence and survival in northern boreal pine forests

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Kyro , M J , Hallikainen , H K , Valkonen , S , Hypponen , M , Puttonen , P , Bergsten , U , Winsa , H & Rautio , P 2022 , ' Effects of overstory tree density, site preparation, and ground vegetation on natural Scots pine seedling emergence and survival in northern boreal pine forests ' , Canadian Journal of Forest Research , vol. 52 , pp. 860–869 . https://doi.org/10.1139/cjfr-2021-0101

Title: Effects of overstory tree density, site preparation, and ground vegetation on natural Scots pine seedling emergence and survival in northern boreal pine forests
Author: Kyro, M. J.; Hallikainen, Helena K.; Valkonen, Sauli; Hypponen, M.; Puttonen, Pasi; Bergsten, Urban; Winsa, H.; Rautio, P.
Contributor organization: Department of Forest Sciences
Metsänomistaja 2020
Forest Ecology and Management
University of Helsinki
Date: 2022-05
Language: eng
Number of pages: 10
Belongs to series: Canadian Journal of Forest Research
ISSN: 0045-5067
DOI: https://doi.org/10.1139/cjfr-2021-0101
URI: http://hdl.handle.net/10138/344590
Abstract: Natural regeneration is a commonly used forest regeneration method in northern Finland. It is not known, however, what would be the optimal overstory density and ground vegetation composition for seedling emergence and survival, and if site preparation is needed to accompany overstory density manipulation. We studied the effects of overstory density (unthinned control and thinning to 50,150, and 250 trees.ha(-1)) and ground vegetation removal (mechanical site preparation with disc trenching) on the number of naturally germinated pine seedlings and survival of individual seedlings over a period of 8 to 11 years. Bare mineral soil was a superior seedbed compared to intact vegetation cover, even though the mortality rate was high on mineral soil. Greater cover of lingonberry, crowberry, and slash had a negative effect on seedling number. Seedling mortality was initially high (60% died during the first 2 years) but decreased throughout the first 5 years. The survival rate of seedlings located in the mineral soil of the upper part of the disc trencher track was twice as high as that of seedlings located in the lower part of the track. High coverage of hair mosses (Polytrichum spp.) was associated with poorer seedling survival. An overstory density of 50-150 trees.ha(-1) with site preparation seems to be an efficient treatment to promote regeneration under these circumstances.
Subject: natural regeneration
survival analysis
thinning
field-layer vegetation
ground-layer vegetation
HEIGHT DEVELOPMENT
CLEAR-CUT
REGENERATION
ESTABLISHMENT
SYLVESTRIS
STANDS
SCARIFICATION
GROWTH
SUCCESS
CLIMATE
4112 Forestry
1181 Ecology, evolutionary biology
Peer reviewed: Yes
Rights: cc_by
Usage restriction: openAccess
Self-archived version: publishedVersion


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