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A carbon-budget app...
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Marshall, JohnSwedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för skogens ekologi och skötsel,Department of Forest Ecology and Management
(författare)
A carbon-budget approach shows that reduced decomposition causes the nitrogen-induced increase in soil carbon in a boreal forest
- Artikel/kapitelEngelska2021
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LIBRIS-ID:oai:gup.ub.gu.se/309451
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https://gup.ub.gu.se/publication/309451URI
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https://doi.org/10.1016/j.foreco.2021.119750DOI
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https://res.slu.se/id/publ/114213URI
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Nitrogen (N) addition causes rapid accumulation of carbon (C) in the soils of boreal forests. The C accumulation has been attributed to an increase in C supply to the soil, to a decrease in mineralization of organic C to CO2, or some combination of the two. We sought to quantify the proportional causes in a case study in a boreal Scots pine forest with or without annual N addition (at 50-100 kg N ha(-1) yr(-1)). We continuously measured soil-surface CO2 exchange with large chambers (20-m(2)surface area) over three growing seasons and derived flux rates from snowpack CO2 profiles during the winter. Models were used to disaggregate the CO2-exchange data into auto-trophic and heterotrophic components. We also measured litterfall and inferred total belowground carbon flux (TBCF). We observed annual soil C accumulation to be higher by 104 g C m(-2) yr(-1) at the fertilized (F) plot compared to the unfertilized reference (R) stand. Total annual C supply to soil (Aboveground litterfall + TBCF) was not increased by the N addition despite a substantial increase in litterfall (+64 g C m(-2) yr(-1)). Instead the sum decreased slightly, by 52 g C m(-2) yr(-1), because of a larger reduction in TBCF. This reduction in soil C supply led us to conclude that the soil C accumulation was entirely due to inhibited substrate mineralization. We speculate that the nitrogen increased soil C by inhibiting heterotrophy, specifically that portion of heterotrophy that is primed by autotrophic carbon.
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Peichl, MatthiasSwedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för skogens ekologi och skötsel,Department of Forest Ecology and Management(Swepub:slu)48058
(författare)
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Tarvainen, Lasse,1977Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Gothenburg University,Göteborgs universitet,Institutionen för biologi och miljövetenskap,Department of Biological and Environmental Sciences,Institutionen för skogens ekologi och skötsel,Department of Forest Ecology and Management,University of Gothenburg(Swepub:slu)96368
(författare)
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Lim, HyungwooSwedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för skogens ekologi och skötsel,Department of Forest Ecology and Management(Swepub:slu)47586
(författare)
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Lundmark, TomasSwedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för skogens ekologi och skötsel,Department of Forest Ecology and Management(Swepub:slu)50171
(författare)
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Näsholm, TorgnySwedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för skoglig genetik och växtfysiologi,Department of Forest Genetics and Plant Physiology(Swepub:slu)48242
(författare)
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Öquist, MatsSwedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för skogens ekologi och skötsel,Department of Forest Ecology and Management(Swepub:slu)46781
(författare)
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Linder, SuneSwedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för sydsvensk skogsvetenskap,Southern Swedish Forest Research Centre(Swepub:slu)49789
(författare)
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Sveriges lantbruksuniversitetInstitutionen för skogens ekologi och skötsel
(creator_code:org_t)
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Sveriges lantbruksuniversitet
Sammanhörande titlar
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Ingår i:Forest Ecology and Management: Elsevier BV5020378-11271872-7042
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