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Nitrogen enrichment impacts on boreal litter decomposition are driven by changes in soil microbiota rather than litter quality
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
2017 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 7, article id 4083Article in journal (Refereed) Published
Abstract [en]

In nitrogen (N) limited boreal forests, N enrichment can impact litter decomposition by affecting litter quality and by changing the soil environment where litter decomposes. We investigated the importance of litter quality and soil factors on litter decomposition using a 2-year reciprocal transplant experiment for Picea abies needle litter, derived from plots subjected to 17 years of N addition, including control, low and high N treatments (ambient, 12.5 and 50 kg N ha(-1) yr(-1), respectively). Our data show that changes in soil factors were the main pathway through which N impacted litter decomposition, with rates reduced by approximate to 15% when placed in high N relative to control plots, regardless of litter origin. Litter decomposition was correlated to soil microbiota, with Picea abies litter decomposition positively correlated with gram negative and fungal functional groups. Our results suggest that previous findings of increase soil C accumulation in response to N deposition is likely to occur as a result of changes in soil microbiota rather than altered litter quality.

Place, publisher, year, edition, pages
Nature Publishing Group, 2017. Vol. 7, article id 4083
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Forest Science
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URN: urn:nbn:se:umu:diva-140236DOI: 10.1038/s41598-017-04523-wISI: 000403874900066PubMedID: 28642496OAI: oai:DiVA.org:umu-140236DiVA, id: diva2:1150821
Available from: 2017-10-20 Created: 2017-10-20 Last updated: 2018-06-09Bibliographically approved

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