Microbial nitrogen dynamics in organic and mineral soil horizons along a latitudinal transect in western Siberia
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 nitrifi...
Published in: | Global Biogeochemical Cycles |
---|---|
Main Authors: | , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
The American Chemical Society (ACS) Publications
2015
|
Subjects: | |
Online Access: | http://hdl.handle.net/1956/10956 https://doi.org/10.1002/2015gb005084 |
id |
ftunivbergen:oai:bora.uib.no:1956/10956 |
---|---|
record_format |
openpolar |
spelling |
ftunivbergen:oai:bora.uib.no:1956/10956 2023-05-15T15:13:59+02:00 Microbial nitrogen dynamics in organic and mineral soil horizons along a latitudinal transect in western Siberia Wild, Birgit Schnecker, Jörg Knoltsch, Anna Takriti, Mounir Mooshammer, Maria Gentsch, Norman Mikutta, Robert Alves, Ricardo J. Eloy Gittel, Antje Lashchinskiy, Nikolay Richter, Andreas 2015-12-29T14:31:41Z application/pdf http://hdl.handle.net/1956/10956 https://doi.org/10.1002/2015gb005084 eng eng The American Chemical Society (ACS) Publications urn:issn:0886-6236 http://hdl.handle.net/1956/10956 https://doi.org/10.1002/2015gb005084 cristin:1262923 Attribution CC BY 4.0 http://creativecommons.org/licenses/by/4.0 Copyright 2015 The Authors tundra Permafrost boreal forest protein depolymerization VDP::Matematikk og naturvitenskap: 400::Basale biofag: 470::Generell mikrobiologi: 472 VDP::Mathematics and natural scienses: 400::Basic biosciences: 470::General microbiology: 472 VDP::Matematikk og Naturvitenskap: 400 Peer reviewed Journal article 2015 ftunivbergen https://doi.org/10.1002/2015gb005084 2023-03-14T17:40:15Z 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 15N pool dilution assays) in organic topsoil, mineral topsoil, and mineral subsoil of seven ecosystems along a latitudinal transect in western Siberia, from tundra (67°N) to steppe (54°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. publishedVersion Article in Journal/Newspaper Arctic permafrost taiga Tundra Siberia University of Bergen: Bergen Open Research Archive (BORA-UiB) Arctic Global Biogeochemical Cycles 29 5 567 582 |
institution |
Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
topic |
tundra Permafrost boreal forest protein depolymerization VDP::Matematikk og naturvitenskap: 400::Basale biofag: 470::Generell mikrobiologi: 472 VDP::Mathematics and natural scienses: 400::Basic biosciences: 470::General microbiology: 472 VDP::Matematikk og Naturvitenskap: 400 |
spellingShingle |
tundra Permafrost boreal forest protein depolymerization VDP::Matematikk og naturvitenskap: 400::Basale biofag: 470::Generell mikrobiologi: 472 VDP::Mathematics and natural scienses: 400::Basic biosciences: 470::General microbiology: 472 VDP::Matematikk og Naturvitenskap: 400 Wild, Birgit Schnecker, Jörg Knoltsch, Anna Takriti, Mounir Mooshammer, Maria Gentsch, Norman Mikutta, Robert Alves, Ricardo J. Eloy Gittel, Antje Lashchinskiy, Nikolay Richter, Andreas Microbial nitrogen dynamics in organic and mineral soil horizons along a latitudinal transect in western Siberia |
topic_facet |
tundra Permafrost boreal forest protein depolymerization VDP::Matematikk og naturvitenskap: 400::Basale biofag: 470::Generell mikrobiologi: 472 VDP::Mathematics and natural scienses: 400::Basic biosciences: 470::General microbiology: 472 VDP::Matematikk og Naturvitenskap: 400 |
description |
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 15N pool dilution assays) in organic topsoil, mineral topsoil, and mineral subsoil of seven ecosystems along a latitudinal transect in western Siberia, from tundra (67°N) to steppe (54°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. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Wild, Birgit Schnecker, Jörg Knoltsch, Anna Takriti, Mounir Mooshammer, Maria Gentsch, Norman Mikutta, Robert Alves, Ricardo J. Eloy Gittel, Antje Lashchinskiy, Nikolay Richter, Andreas |
author_facet |
Wild, Birgit Schnecker, Jörg Knoltsch, Anna Takriti, Mounir Mooshammer, Maria Gentsch, Norman Mikutta, Robert Alves, Ricardo J. Eloy Gittel, Antje Lashchinskiy, Nikolay Richter, Andreas |
author_sort |
Wild, Birgit |
title |
Microbial nitrogen dynamics in organic and mineral soil horizons along a latitudinal transect in western Siberia |
title_short |
Microbial nitrogen dynamics in organic and mineral soil horizons along a latitudinal transect in western Siberia |
title_full |
Microbial nitrogen dynamics in organic and mineral soil horizons along a latitudinal transect in western Siberia |
title_fullStr |
Microbial nitrogen dynamics in organic and mineral soil horizons along a latitudinal transect in western Siberia |
title_full_unstemmed |
Microbial nitrogen dynamics in organic and mineral soil horizons along a latitudinal transect in western Siberia |
title_sort |
microbial nitrogen dynamics in organic and mineral soil horizons along a latitudinal transect in western siberia |
publisher |
The American Chemical Society (ACS) Publications |
publishDate |
2015 |
url |
http://hdl.handle.net/1956/10956 https://doi.org/10.1002/2015gb005084 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic permafrost taiga Tundra Siberia |
genre_facet |
Arctic permafrost taiga Tundra Siberia |
op_relation |
urn:issn:0886-6236 http://hdl.handle.net/1956/10956 https://doi.org/10.1002/2015gb005084 cristin:1262923 |
op_rights |
Attribution CC BY 4.0 http://creativecommons.org/licenses/by/4.0 Copyright 2015 The Authors |
op_doi |
https://doi.org/10.1002/2015gb005084 |
container_title |
Global Biogeochemical Cycles |
container_volume |
29 |
container_issue |
5 |
container_start_page |
567 |
op_container_end_page |
582 |
_version_ |
1766344491022680064 |