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Shifts in microbial...
Shifts in microbial community composition and metabolism correspond with rapid soil carbon accumulation in response to 20 years of simulated nitrogen deposition
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- Forsmark, Benjamin (författare)
- Sveriges lantbruksuniversitet,Swedish University of Agricultural Sciences,Institutionen för skogens ekologi och skötsel,Department of Forest Ecology and Management
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- Bizjak, Tinkara (författare)
- Sveriges lantbruksuniversitet,Swedish University of Agricultural Sciences, Umeå,Institutionen för skoglig genetik och växtfysiologi,Department of Forest Genetics and Plant Physiology
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- Nordin, Annika (författare)
- Sveriges lantbruksuniversitet,Swedish University of Agricultural Sciences, Umeå,Institutionen för skoglig genetik och växtfysiologi,Department of Forest Genetics and Plant Physiology
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- Rosenstock, Nicholas P. (författare)
- Lund University,Lunds universitet,Centrum för miljö- och klimatvetenskap (CEC),Naturvetenskapliga fakulteten,Centre for Environmental and Climate Science (CEC),Faculty of Science
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- Wallander, Håkan (författare)
- Lund University,Lunds universitet,MEMEG,Biologiska institutionen,Naturvetenskapliga fakulteten,BECC: Biodiversity and Ecosystem services in a Changing Climate,Centrum för miljö- och klimatvetenskap (CEC),Mikrobiologisk ekologi,Forskargrupper vid Lunds universitet,Department of Biology,Faculty of Science,Centre for Environmental and Climate Science (CEC),Microbial Ecology,Lund University Research Groups
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- Gundale, Michael (författare)
- Sveriges lantbruksuniversitet,Swedish University of Agricultural Sciences,Institutionen för skogens ekologi och skötsel,Department of Forest Ecology and Management
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(creator_code:org_t)
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- 2024
- 2024
- Engelska 13 s.
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Ingår i: Science of the Total Environment. - 0048-9697 .- 1879-1026. ; 918
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Abstract
Ämnesord
Stäng
- Anthropogenic nitrogen (N) deposition and fertilization in boreal forests frequently reduces decomposition and soil respiration and enhances C storage in the topsoil. This enhancement of the C sink can be as strong as the aboveground biomass response to N additions and has implications for the global C cycle, but the mechanisms remain elusive. We hypothesized that this effect would be associated with a shift in the microbial community and its activity, and particularly by fungal taxa reported to be capable of lignin degradation and organic N acquisition. We sampled the organic layer below the intact litter of a Norway spruce (Picea abies (L.) Karst) forest in northern Sweden after 20 years of annual N additions at low (12.5 kg N ha−1 yr−1) and high (50 kg N ha−1 yr−1) rates. We measured microbial biomass using phospholipid fatty-acid analysis (PLFA) and ergosterol measurements and used ITS metagenomics to profile the fungal community of soil and fine-roots. We probed the metabolic activity of the soil community by measuring the activity of extracellular enzymes and evaluated its relationships with the most N responsive soil fungal species. Nitrogen addition decreased the abundance of fungal PLFA markers and changed the fungal community in humus and fine-roots. Specifically, the humus community changed in part due to a shift from Oidiodendron pilicola, Cenococcum geophilum, and Cortinarius caperatus to Tylospora fibrillosa and Russula griseascens. These microbial community changes were associated with decreased activity of Mn-peroxidase and peptidase, and an increase in the activity of C acquiring enzymes. Our results show that the rapid accumulation of C in the humus layer frequently observed in areas with high N deposition is consistent with a shift in microbial metabolism, where decomposition associated with organic N acquisition is downregulated when inorganic N forms are readily available.
Ämnesord
- LANTBRUKSVETENSKAPER -- Lantbruksvetenskap, skogsbruk och fiske -- Markvetenskap (hsv//swe)
- AGRICULTURAL SCIENCES -- Agriculture, Forestry and Fisheries -- Soil Science (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Environmental Sciences (hsv//eng)
Nyckelord
- Boreal forest
- Carbon sequestration
- Ectomycorrhizal fungi
- Extracellular enzymes
- Microbial community
- Nitrogen deposition
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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