Disentangling direct and indirect effects of water table drawdown on above and belowground plant litter decomposition: Consequences for accumulation of organic matter in boreal peatlands.

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dc.contributor University of Helsinki, Department of Forest Sciences en
dc.contributor University of Helsinki, Department of Forest Sciences en
dc.contributor.author Strakova, Petra
dc.contributor.author Penttilä, Timo
dc.contributor.author Laine, Jukka
dc.contributor.author Laiho, Raija
dc.date.accessioned 2012-06-19T08:00:04Z
dc.date.available 2012-06-19T08:00:04Z
dc.date.issued 2012
dc.identifier.citation Strakova , P , Penttilä , T , Laine , J & Laiho , R 2012 , ' Disentangling direct and indirect effects of water table drawdown on above and belowground plant litter decomposition: Consequences for accumulation of organic matter in boreal peatlands. ' , Global Change Biology , vol. 18 , no. 1 , pp. 322–335 . https://doi.org/10.1111/j.1365-2486.2011.02503.x en
dc.identifier.issn 1354-1013
dc.identifier.other PURE: 15598026
dc.identifier.other PURE UUID: 6ec2cb2c-be62-46de-8359-5df618f86335
dc.identifier.other WOS: 000298598900027
dc.identifier.other Scopus: 80855158165
dc.identifier.uri http://hdl.handle.net/10138/34617
dc.description.abstract Pristine peatlands are carbon (C) accumulating wetland ecosystems sustained by a high water table (WT) and consequent anoxia that slows down decomposition. Persistent WT drawdown as a response to climate and/or land-use change affects decomposition either directly through environmental factors such as increased oxygenation, or indirectly through changes in plant community composition. This study attempts to disentangle the direct and indirect effects of WT drawdown by measuring the relative importance of environmental parameters (WT depth, temperature, soil chemistry) and litter type and/or litter chemical quality on the 2-year decomposition rates of above- and belowground litter (altogether 39 litter types). Consequences for organic matter accumulation were estimated based on the annual litter production. The study sites were chosen to form a three stage chronosequence from pristine (undrained) to short-term (years) and long-term (decades) WT drawdown conditions at three nutrient regimes. The direct effects of WT drawdown were overruled by the indirect effects via changes in litter type composition and production. Short-term responses to WT drawdown were small. In long-term, dramatically increased litter inputs resulted in large accumulation of organic matter in spite of increased decomposition rates. Further, the quality of the accumulated matter greatly changed from that accumulated in pristine conditions. Our results show that the shift in vegetation composition as a response to climate and/or land-use change is the main factor affecting peatland ecosystem C cycle and thus dynamic vegetation is a necessity in any models applied for estimating responses of C fluxes to changing environment. We provide possible grouping of litter types into plant functional types that the models could utilize. Further, our results clearly show a drop in soil summer temperature as a response to WT drawdown when an initially open peatland converts into a forest ecosystem, which has not yet been considered in the existing models. fi
dc.format.extent 14
dc.language.iso eng
dc.relation.ispartof Global Change Biology
dc.rights en
dc.title Disentangling direct and indirect effects of water table drawdown on above and belowground plant litter decomposition: Consequences for accumulation of organic matter in boreal peatlands. en
dc.type Article
dc.description.version Non Peer reviewed
dc.identifier.doi https://doi.org/10.1111/j.1365-2486.2011.02503.x
dc.type.uri info:eu-repo/semantics/other
dc.type.uri http://purl.org/eprint/status/NonPeerReviewed
dc.contributor.pbl

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