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Plant roots increase both decomposition and stable organic matter formation in boreal forest soil
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Number of Authors: 102019 (English)In: Nature Communications, ISSN 2041-1723, E-ISSN 2041-1723, Vol. 10, article id 3982Article in journal (Refereed) Published
Abstract [en]

Boreal forests are ecosystems with low nitrogen (N) availability that store globally significant amounts of carbon (C), mainly in plant biomass and soil organic matter (SOM). Although crucial for future climate change predictions, the mechanisms controlling boreal C and N pools are not well understood. Here, using a three-year field experiment, we compare SOM decomposition and stabilization in the presence of roots, with exclusion of roots but presence of fungal hyphae and with exclusion of both roots and fungal hyphae. Roots accelerate SOM decomposition compared to the root exclusion treatments, but also promote a different soil N economy with higher concentrations of organic soil N compared to inorganic soil N accompanied with the build-up of stable SOM-N. In contrast, root exclusion leads to an inorganic soil N economy (i.e., high level of inorganic N) with reduced stable SOM-N buildup. Based on our findings, we provide a framework on how plant roots affect SOM decomposition and stabilization.

Place, publisher, year, edition, pages
2019. Vol. 10, article id 3982
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Biological Sciences
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URN: urn:nbn:se:su:diva-174876DOI: 10.1038/s41467-019-11993-1ISI: 000483716100008PubMedID: 31484931OAI: oai:DiVA.org:su-174876DiVA, id: diva2:1360658
Available from: 2019-10-14 Created: 2019-10-14 Last updated: 2019-10-14Bibliographically approved

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Adamczyk, BartoszSietio, Outi-MaariaWild, BirgitPihlatie, MariRichter, AndreasHeinonsalo, Jussi
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Department of Environmental Science and Analytical Chemistry
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