dc.identifier.uri |
http://dx.doi.org/10.15488/483 |
|
dc.identifier.uri |
http://www.repo.uni-hannover.de/handle/123456789/507 |
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dc.contributor.author |
Wild, Birgit
|
|
dc.contributor.author |
Schnecker, Jörg
|
|
dc.contributor.author |
Knoltsch, Anna
|
|
dc.contributor.author |
Takriti, Mounir
|
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dc.contributor.author |
Mooshammer, Maria
|
|
dc.contributor.author |
Gentsch, Norman
|
|
dc.contributor.author |
Mikutta, Robert
|
|
dc.contributor.author |
Alves, Ricardo J. Eloy
|
|
dc.contributor.author |
Gittel, Antje
|
|
dc.contributor.author |
Lashchinskiy, Nikolay
|
|
dc.contributor.author |
Richter, Andreas
|
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dc.date.accessioned |
2016-09-01T09:05:32Z |
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dc.date.available |
2016-09-01T09:05:32Z |
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dc.date.issued |
2015-05 |
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dc.identifier.citation |
Wild, Birgit; Schnecker, Joerg; Knoltsch, Anna; Takriti, Mounir; Mooshammer, Maria et al.: Microbial nitrogen dynamics in organic and mineral soil horizons along a latitudinal transect in western Siberia. In: Global Biogeochemical Cycles 29 (2015), Nr. 5, S. 567-582. DOI: http://dx.doi.org/10.1002/2015GB005084 |
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dc.description.abstract |
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. |
eng |
dc.description.sponsorship |
Austrian Science Fund/FWF/1370-B17 |
|
dc.language.iso |
eng |
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dc.publisher |
Washington : Amer Geophysical Union |
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dc.relation.ispartofseries |
Global Biogeochemical Cycles 29 (2015), Nr. 5 |
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dc.rights |
CC BY 4.0 Unported |
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dc.rights.uri |
https://creativecommons.org/licenses/by/4.0/ |
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dc.subject |
tundra |
eng |
dc.subject |
permafrost |
eng |
dc.subject |
boreal forest |
eng |
dc.subject |
protein depolymerization |
eng |
dc.subject |
arctic tundra |
eng |
dc.subject |
terrestrial ecosystems |
eng |
dc.subject |
carbon availability |
eng |
dc.subject |
forest ecosystems |
eng |
dc.subject |
alaskan tundra |
eng |
dc.subject |
use efficiency |
eng |
dc.subject |
plant-growth |
eng |
dc.subject |
n uptake |
eng |
dc.subject |
permafrost |
eng |
dc.subject |
matter |
eng |
dc.subject.ddc |
500 | Naturwissenschaften
|
ger |
dc.subject.ddc |
570 | Biowissenschaften, Biologie
|
ger |
dc.subject.ddc |
540 | Chemie
|
ger |
dc.title |
Microbial nitrogen dynamics in organic and mineral soil horizons along a latitudinal transect in western Siberia |
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dc.type |
Article |
|
dc.type |
Text |
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dc.relation.essn |
1944-9224 |
|
dc.relation.issn |
0886-6236 |
|
dc.relation.doi |
http://dx.doi.org/10.1002/2015GB005084 |
|
dc.bibliographicCitation.issue |
5 |
|
dc.bibliographicCitation.volume |
29 |
|
dc.bibliographicCitation.firstPage |
567 |
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dc.bibliographicCitation.lastPage |
582 |
|
dc.description.version |
publishedVersion |
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tib.accessRights |
frei zug�nglich |
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