Soil geochemistry confines microbial abundances across an Arctic landscape; Implications for net carbon exchange with the atmosphere
A large portion of the World’s terrestrial organic carbon is stored in Arctic permafrost soils.However, due to permafrost warming and increased in situ microbial mineralisation of released carbon,greenhouse gas releases from Arctic soils are increasing, including methane (CH4 (g) ). To identify envi...
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ftunivnewcastle:oai:eprint.ncl.ac.uk:199035 2023-05-15T14:35:30+02:00 Soil geochemistry confines microbial abundances across an Arctic landscape; Implications for net carbon exchange with the atmosphere Gray ND McCann CM Christgen B Ahammad SZ Roberts JA Graham DW 30-05-2014 application/pdf https://eprint.ncl.ac.uk/fulltext.aspx?url=199035/38A47329-0B10-4335-B11C-0A383E9F5E16.pdf&pub_id=199035 unknown Springer Biogeochemistry, 30-05-2014 Article 2014 ftunivnewcastle 2020-06-11T23:22:50Z A large portion of the World’s terrestrial organic carbon is stored in Arctic permafrost soils.However, due to permafrost warming and increased in situ microbial mineralisation of released carbon,greenhouse gas releases from Arctic soils are increasing, including methane (CH4 (g) ). To identify environ-mental controls on such releases, we characterised soil geochemistry and microbial community conditions in13 near-surface Arctic soils collected across Kongsfjorden, Svalbard. Statistically significant correlationswere found between proxies for carbonate mineral content (i.e. Ca and Mg) and soil pH (Spearman rho =0.87, p \ 0.001). In turn, pH significantly inversely correlated with bacterial and Type I methanotrophgene abundances across the soils (r =-0.71, p = 0.01 and r =-0.74, p = 0.006, respectively),which also co-varied with soil phosphorous (P) level (r = 0.79, p = 0.01 and r = 0.63, p = 0.02, respec-tively). These results suggest that soil P supply, which is controlled by pH and other factors, significantlyinfluences in situ microbial abundances in these Arctic soils. Overall, we conclude microbial responses toincreasing ‘old carbon’ releases in this Arctic region are constrained by nutrient-deficiency in surface soils,with consequential impacts on the flux and composition of carbon gasses released to the atmosphere. Article in Journal/Newspaper Arctic Kongsfjord* Kongsfjorden permafrost Svalbard Newcastle University Library ePrints Service Arctic Rho ENVELOPE(-63.000,-63.000,-64.300,-64.300) Svalbard |
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Newcastle University Library ePrints Service |
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ftunivnewcastle |
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description |
A large portion of the World’s terrestrial organic carbon is stored in Arctic permafrost soils.However, due to permafrost warming and increased in situ microbial mineralisation of released carbon,greenhouse gas releases from Arctic soils are increasing, including methane (CH4 (g) ). To identify environ-mental controls on such releases, we characterised soil geochemistry and microbial community conditions in13 near-surface Arctic soils collected across Kongsfjorden, Svalbard. Statistically significant correlationswere found between proxies for carbonate mineral content (i.e. Ca and Mg) and soil pH (Spearman rho =0.87, p \ 0.001). In turn, pH significantly inversely correlated with bacterial and Type I methanotrophgene abundances across the soils (r =-0.71, p = 0.01 and r =-0.74, p = 0.006, respectively),which also co-varied with soil phosphorous (P) level (r = 0.79, p = 0.01 and r = 0.63, p = 0.02, respec-tively). These results suggest that soil P supply, which is controlled by pH and other factors, significantlyinfluences in situ microbial abundances in these Arctic soils. Overall, we conclude microbial responses toincreasing ‘old carbon’ releases in this Arctic region are constrained by nutrient-deficiency in surface soils,with consequential impacts on the flux and composition of carbon gasses released to the atmosphere. |
format |
Article in Journal/Newspaper |
author |
Gray ND McCann CM Christgen B Ahammad SZ Roberts JA Graham DW |
spellingShingle |
Gray ND McCann CM Christgen B Ahammad SZ Roberts JA Graham DW Soil geochemistry confines microbial abundances across an Arctic landscape; Implications for net carbon exchange with the atmosphere |
author_facet |
Gray ND McCann CM Christgen B Ahammad SZ Roberts JA Graham DW |
author_sort |
Gray ND |
title |
Soil geochemistry confines microbial abundances across an Arctic landscape; Implications for net carbon exchange with the atmosphere |
title_short |
Soil geochemistry confines microbial abundances across an Arctic landscape; Implications for net carbon exchange with the atmosphere |
title_full |
Soil geochemistry confines microbial abundances across an Arctic landscape; Implications for net carbon exchange with the atmosphere |
title_fullStr |
Soil geochemistry confines microbial abundances across an Arctic landscape; Implications for net carbon exchange with the atmosphere |
title_full_unstemmed |
Soil geochemistry confines microbial abundances across an Arctic landscape; Implications for net carbon exchange with the atmosphere |
title_sort |
soil geochemistry confines microbial abundances across an arctic landscape; implications for net carbon exchange with the atmosphere |
publisher |
Springer |
publishDate |
2014 |
url |
https://eprint.ncl.ac.uk/fulltext.aspx?url=199035/38A47329-0B10-4335-B11C-0A383E9F5E16.pdf&pub_id=199035 |
long_lat |
ENVELOPE(-63.000,-63.000,-64.300,-64.300) |
geographic |
Arctic Rho Svalbard |
geographic_facet |
Arctic Rho Svalbard |
genre |
Arctic Kongsfjord* Kongsfjorden permafrost Svalbard |
genre_facet |
Arctic Kongsfjord* Kongsfjorden permafrost Svalbard |
op_source |
Biogeochemistry, 30-05-2014 |
_version_ |
1766308312692817920 |