Journal article
Anthropogenic nitrogen enrichment enhances soil carbon accumulation by impacting saprotrophs rather than ectomycorrhizal fungal activity.
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Maaroufi NI
Institute of Plant Sciences, University of Bern, Bern, Switzerland.
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Nordin A
Department of Forest Genetics and Plant Physiology, Umeå Plant Science Center, Swedish University of Agricultural Sciences, Umeå, Sweden.
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Palmqvist K
Department of Ecology and Environmental Science, Umeå University, Umeå, Sweden.
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Hasselquist NJ
Department of Forest Ecology and Management, Swedish University of Agriculture Sciences, Umeå, Sweden.
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Forsmark B
Department of Forest Ecology and Management, Swedish University of Agriculture Sciences, Umeå, Sweden.
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Rosenstock NP
Center for Environmental and Climate Research, Lund University, Lund, Sweden.
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Wallander H
Department of Microbial Ecology, Lund University, Lund, Sweden.
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Gundale MJ
Department of Forest Ecology and Management, Swedish University of Agriculture Sciences, Umeå, Sweden.
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Published in:
- Global change biology. - 2019
English
There is evidence that anthropogenic nitrogen (N) deposition enhances carbon (C) sequestration in boreal forest soils. However, it is unclear how free-living saprotrophs (bacteria and fungi, SAP) and ectomycorrhizal (EM) fungi responses to N addition impact soil C dynamics. Our aim was to investigate how SAP and EM communities are impacted by N enrichment and to estimate whether these changes influence decay of litter and humus. We conducted a long-term experiment in northern Sweden, maintained since 2004, consisting of ambient, low N additions (0, 3, 6, and 12 kg N ha-1 year-1 ) simulating current N deposition rates in the boreal region, as well as a high N addition (50 kg N ha-1 year-1 ). Our data showed that long-term N enrichment impeded mass loss of litter, but not of humus, and only in response to the highest N addition treatment. Furthermore, our data showed that EM fungi reduced the mass of N and P in both substrates during the incubation period compared to when only SAP organisms were present. Low N additions had no effect on microbial community structure, while the high N addition decreased fungal and bacterial biomasses and altered EM fungi and SAP community composition. Actinomycetes were the only bacterial SAP to show increased biomass in response to the highest N addition. These results provide a mechanistic understanding of how anthropogenic N enrichment can influence soil C accumulation rates and suggest that current N deposition rates in the boreal region (≤12 kg N ha-1 year-1 ) are likely to have a minor impact on the soil microbial community and the decomposition of humus and litter.
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Language
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Open access status
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closed
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Identifiers
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Persistent URL
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https://folia.unifr.ch/global/documents/186657
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