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A carbon-budget approach shows that reduced decomposition causes the nitrogen-induced increase in soil carbon in a boreal forest
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- Marshall, John (author)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för skogens ekologi och skötsel,Department of Forest Ecology and Management
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- Peichl, Matthias (author)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för skogens ekologi och skötsel,Department of Forest Ecology and Management
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- Tarvainen, Lasse, 1977 (author)
- Swedish 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
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- Elsevier BV, 2021
- 2021
- English.
- In: Forest Ecology and Management. - : Elsevier BV. - 0378-1127 .- 1872-7042. ; 502
- Journal article (peer-reviewed)
Abstract
Subject headings
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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.
Subject headings
- NATURVETENSKAP -- Biologi -- Ekologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Ecology (hsv//eng)
- LANTBRUKSVETENSKAPER -- Lantbruksvetenskap, skogsbruk och fiske -- Skogsvetenskap (hsv//swe)
- AGRICULTURAL SCIENCES -- Agriculture, Forestry and Fisheries -- Forest Science (hsv//eng)
Keyword
- Allocation
- Automated chamber system
- Belowground partitioning
- Lignin
- Pinus sylvestris
- Respiration
- growing-season
- use efficiency
- flux
- co2
- allocation
- sequestration
- fertilization
- respiration
- ecosystems
- deposition
- Forestry
Publication and Content Type
- ref (subject category)
- art (subject category)
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- Marshall, John
- Peichl, Matthias
- Tarvainen, Lasse ...
- Lim, Hyungwoo
- Lundmark, Tomas
- Näsholm, Torgny
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- Öquist, Mats
- Linder, Sune
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- About the subject
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- NATURAL SCIENCES
- NATURAL SCIENCES
- and Biological Scien ...
- and Ecology
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- University of Gothenburg
- Swedish University of Agricultural Sciences
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