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Why does nitrogen addition to forest soils inhibit decomposition?
Umeå University, Faculty of Science and Technology, Department of Plant Physiology.
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2019 (English)In: Soil Biology and Biochemistry, ISSN 0038-0717, E-ISSN 1879-3428, Vol. 137, article id 107570Article in journal (Refereed) Published
Abstract [en]

Enrichment of forest soils with inorganic nitrogen (N) tends to inhibit oxidative enzyme expression by microbes and reduces plant litter and soil organic matter decomposition rates. Without further explanation than is currently presented in the scientific literature, we argue that upregulation of oxidative enzymes seems a more competitive response to prolonged N enrichment at high rates than the observed downregulation. Thus, as it stands, observed responses are inconsistent with predicted responses. In this article, we present a hypothesis that resolves this conflict. We suggest that high rates of N addition alter the competitive balance between enzymatic lignin mineralisation and non-enzymatic lignin oxidation. Using metatransciptomics and chemical assays to examine boreal forest soils, we found that N addition suppressed peroxidase activity, but not iron reduction activity (involved in non-enzymatic lignin oxidation). Our hypothesis seems positioned as a parsimonious and empirically consistent working model that warrants further testing.

Place, publisher, year, edition, pages
2019. Vol. 137, article id 107570
Keywords [en]
Lignin decomposition, Soil carbon cycling, Nitrogen fertilisation, Brown and white rot fungi, Oxidative zymes, Fenton reaction
National Category
Soil Science
Identifiers
URN: urn:nbn:se:umu:diva-165686DOI: 10.1016/j.soilbio.2019.107570ISI: 000489066300014OAI: oai:DiVA.org:umu-165686DiVA, id: diva2:1376020
Funder
Knut and Alice Wallenberg Foundation, 2015.0047Available from: 2019-12-06 Created: 2019-12-06 Last updated: 2019-12-06Bibliographically approved

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Schneider, Andreas N.Street, Nathaniel R.

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Castro, DavidSchneider, Andreas N.Street, Nathaniel R.
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