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Microbial nitrogen ...
Microbial nitrogen dynamics in organic and mineral soil horizons along a latitudinal transect in western Siberia
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- Wild, Birgit (författare)
- Gothenburg University,Göteborgs universitet,Institutionen för geovetenskaper,Department of Earth Sciences
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Schnecker, J. (författare)
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Knoltsch, A. (författare)
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Takriti, M. (författare)
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Mooshammer, M. (författare)
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Gentsch, N. (författare)
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Mikutta, R. (författare)
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Alves, R. J. E. (författare)
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Gittel, A. (författare)
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Lashchinskiy, N. (författare)
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Richter, A. (författare)
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(creator_code:org_t)
- 2015-05-12
- 2015
- Engelska.
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Ingår i: Global Biogeochemical Cycles. - : American Geophysical Union (AGU). - 0886-6236 .- 1944-9224. ; 29:5, s. 567-582
- Relaterad länk:
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Soil N availability is constrained by the breakdown of N-containing polymers such as proteins to oligopeptides and amino acids that can be taken up by plants and microorganisms. Excess N is released from microbial cells as ammonium (N mineralization), which in turn can serve as substrate for nitrification. According to stoichiometric theory, N mineralization and nitrification are expected to increase in relation to protein depolymerization with decreasing N limitation, and thus from higher to lower latitudes and from topsoils to subsoils. To test these hypotheses, we compared gross rates of protein depolymerization, N mineralization and nitrification (determined using N-15 pool dilution assays) in organic topsoil, mineral topsoil, and mineral subsoil of seven ecosystems along a latitudinal transect in western Siberia, from tundra (67 degrees N) to steppe (54 degrees N). The investigated ecosystems differed strongly in N transformation rates, with highest protein depolymerization and N mineralization rates in middle and southern taiga. All N transformation rates decreased with soil depth following the decrease in organic matter content. Related to protein depolymerization, N mineralization and nitrification were significantly higher in mineral than in organic horizons, supporting a decrease in microbial N limitation with depth. In contrast, we did not find indications for a decrease in microbial N limitation from arctic to temperate ecosystems along the transect. Our findings thus challenge the perception of ubiquitous N limitation at high latitudes, but suggest a transition from N to C limitation of microorganisms with soil depth, even in high-latitude systems such as tundra and boreal forest.
Ämnesord
- NATURVETENSKAP -- Geovetenskap och miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences (hsv//eng)
Nyckelord
- tundra
- permafrost
- boreal forest
- protein depolymerization
- ARCTIC TUNDRA
- TERRESTRIAL ECOSYSTEMS
- CARBON AVAILABILITY
- FOREST
- ECOSYSTEMS
- ALASKAN TUNDRA
- USE EFFICIENCY
- PLANT-GROWTH
- N UPTAKE
- PERMAFROST
- MATTER
- Environmental Sciences
- Geosciences
- Multidisciplinary
- Atmospheric Sciences
- ST WM
- 1985
- NATURE
- V317
- P613
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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Till lärosätets databas
- Av författaren/redakt...
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Wild, Birgit
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Schnecker, J.
-
Knoltsch, A.
-
Takriti, M.
-
Mooshammer, M.
-
Gentsch, N.
-
visa fler...
-
Mikutta, R.
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Alves, R. J. E.
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Gittel, A.
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Lashchinskiy, N.
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Richter, A.
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visa färre...
- Om ämnet
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- NATURVETENSKAP
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NATURVETENSKAP
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Global Biogeoche ...
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Göteborgs universitet