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Stand development effects on N₂-fixation and seedling performance in northern boreal forests

Stuiver, Babs (2015). Stand development effects on N₂-fixation and seedling performance in northern boreal forests. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis agriculturae Sueciae, 1652-6880 ; 2015:108
ISBN 978-91-576-8414-1
eISBN 978-91-576-8415-8
[Doctoral thesis]

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Abstract

For large parts of the Swedish boreal forests, stand development starts with clear-cutting. Still, much is unknown about how stand development affects ecosystem processes and how these processes are driven by changes in vegetation and soil properties that occur during stand development. In this thesis, the processes of feather moss associated N₂-fixation and tree seedling regeneration are examined along a post clear-cut chronosequence which consisted of 32 stands; eight in each of four development stages with mean ages of 4, 16, 34, and 123 years. Stand development had statistically significant effects on the total amount of N fixed at the stand level. The N₂-fixation rates initially increased after clear-cutting and peaked in the 16-year old stands at rates of 1.0 kg N ha-1 yr-1, after which the rates declined and remained at levels similar to those found in young clear-cut stands even when stands had reached maturity. This pattern was associated with high moss biomass and positive effects of local conditions on N fixed per kg moss mass in the 16-year old stands. The cumulative contribution of N₂-fixation to the total accrual of N per ha in the aboveground vegetation and humus layer during one stand rotation was about 9%.

Stand development had negative effects on the growth of Pinus sylvestris seedlings as a consequence of changes in the canopy. In contrast, the effect of stand development on Picea abies seedling growth was mainly driven by soil properties, and seedlings performed best when grown in soils originating from the 34-year old stands. Seedling mortality decreased with stand age for both P. sylvestris and P. abies seedlings, which was mainly caused by a positive effect of the canopy. The effect of several moss species on P. sylvestris seedling growth was further explored in a greenhouse mesocosm experiment. Seedling growth was most negatively affected by Hylocomium splendens and in pots with high moss biomass, likely driven by differences in moss depth related to moss species and moss biomass. This thesis shows that stand development has strong effects on N₂-fixation rates and the performance of P. sylvestris and P. abies seedlings in production forests. However, these effects and their drivers do not necessarily respond linearly to stand development and can differ between moss and tree species with potential long-term consequences for the functioning of boreal forests.

Authors/Creators:Stuiver, Babs
Title:Stand development effects on N₂-fixation and seedling performance in northern boreal forests
Series/Journal:Acta Universitatis agriculturae Sueciae (1652-6880)
Year of publishing :2015
Depositing date:22 October 2015
Volume:2015:108
Number of Pages:77
Papers/manuscripts:
NumberReferences
IStuiver, B.M., Gundale, M.J., Wardle, D.A., Nilsson, M-C., (2015). Nitrogen fixation rates associated with the feather mosses Pleurozium schreberi and Hylocomium splendens during stand development following clear-cutting. Forest Ecology and Management 347, 130-139.
IIStuiver, B.M., Wardle, D.A., Gundale, M.J., Nilsson, M-C. Seedling responses to changes in canopy and soil properties during stand development following clear-cutting (manuscript).
IIIStuiver, B.M., Wardle, D.A., Gundale, M.J., Nilsson, M-C., (2014). The impact of moss species and biomass on the growth of Pinus sylvestris tree seedlings at different precipitation frequencies. Forests 5(8), 1931-1951.
Place of Publication:Uppsala
Publisher:Department of Forest Ecology and Management, Swedish University of Agricultural Sciences
ISBN for printed version:978-91-576-8414-1
ISBN for electronic version:978-91-576-8415-8
ISSN:1652-6880
Language:English
Additional Information:Funded by TC4F, a cooperation between SLU, Skogforsk and Umeå University
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:F Plant production > F40 Plant ecology
K Forestry > K01 Forestry - General aspects
P Natural resources > P01 Nature conservation and land resources
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Ecology
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Forest Science
Agrovoc terms:boreal forests, pinus sylvestris, picea abies, clear felling, plant establishment, seedlings, growth, bryophyta, nitrogen fixation, vegetation, succession, undergrowth, sweden
Keywords:bryophytes, chronosequence, clear-cut, forest regeneration, forest nitrogen balance, forest succession, logging, Norway spruce, Scots pine, understory vegetation
URN:NBN:urn:nbn:se:slu:epsilon-e-3012
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-3012
ID Code:12731
Faculty:S - Faculty of Forest Sciences
Department:(S) > Dept. of Forest Ecology and Management
Deposited By: Babs Stuiver
Deposited On:23 Oct 2015 06:55
Metadata Last Modified:09 Feb 2016 08:51

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