Chemical Indicators of Cryoturbation and Microbial Processing throughout an Alaskan Permafrost Soil Depth Profile
Although permafrost soils contain vast stores of organic C, relatively little is known about the chemical composition of their constituent soil organic matter (SOM). Mineral permafrost and organic (OAL) and mineral active layer (MAL) soils from Sagwon Hills, AK were analyzed for total C and N conten...
Published in: | Soil Science Society of America Journal |
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crwiley:10.2136/sssaj2014.10.0420 2024-09-09T20:02:42+00:00 Chemical Indicators of Cryoturbation and Microbial Processing throughout an Alaskan Permafrost Soil Depth Profile Ernakovich, Jessica G. Wallenstein, Matthew D. Calderón, F.J. Department of Energy Global Change Education Program 2015 http://dx.doi.org/10.2136/sssaj2014.10.0420 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.2136%2Fsssaj2014.10.0420 http://onlinelibrary.wiley.com/wol1/doi/10.2136/sssaj2014.10.0420/fullpdf en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Soil Science Society of America Journal volume 79, issue 3, page 783-793 ISSN 0361-5995 1435-0661 journal-article 2015 crwiley https://doi.org/10.2136/sssaj2014.10.0420 2024-06-20T04:26:25Z Although permafrost soils contain vast stores of organic C, relatively little is known about the chemical composition of their constituent soil organic matter (SOM). Mineral permafrost and organic (OAL) and mineral active layer (MAL) soils from Sagwon Hills, AK were analyzed for total C and N content and SOM chemical composition using Fourier transformed mid‐infrared spectroscopy (MidIR). We also investigated techniques for proper collection of MidIR spectra on high C soils, such as permafrost. Principal Components Analysis (PCA) of the MidIR spectra revealed that the OAL was different from the MAL and permafrost based on absorbance of various organic functional groups, such as hydroxyls, alkyls, carbonyls, amines, amides, and esters. The top of the permafrost (0–15 cm below the maximum active layer thaw depth) was also differentiated from the deeper permafrost (16–40 cm below) by the same organic functional groups. Spectral data suggested that there is more chemically labile C (e.g., hydroxyl, amine groups, carbohydrates) in the OAL than the top of the permafrost, which in turn has more labile C than the MAL and deeper permafrost. The chemical similarity between the top of the permafrost and the OAL, and its differences with the MAL, suggest that organic matter (OM) is introduced into the permafrost through cryoturbation. All the soils showed evidence of microbial processing, such as organic acids and carboxylates, however the relative abundance of these compounds varied by soil depth. This study advances our understanding of permafrost C chemistry and the reactivity of constituent compounds. Article in Journal/Newspaper permafrost Wiley Online Library Soil Science Society of America Journal 79 3 783 793 |
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English |
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Although permafrost soils contain vast stores of organic C, relatively little is known about the chemical composition of their constituent soil organic matter (SOM). Mineral permafrost and organic (OAL) and mineral active layer (MAL) soils from Sagwon Hills, AK were analyzed for total C and N content and SOM chemical composition using Fourier transformed mid‐infrared spectroscopy (MidIR). We also investigated techniques for proper collection of MidIR spectra on high C soils, such as permafrost. Principal Components Analysis (PCA) of the MidIR spectra revealed that the OAL was different from the MAL and permafrost based on absorbance of various organic functional groups, such as hydroxyls, alkyls, carbonyls, amines, amides, and esters. The top of the permafrost (0–15 cm below the maximum active layer thaw depth) was also differentiated from the deeper permafrost (16–40 cm below) by the same organic functional groups. Spectral data suggested that there is more chemically labile C (e.g., hydroxyl, amine groups, carbohydrates) in the OAL than the top of the permafrost, which in turn has more labile C than the MAL and deeper permafrost. The chemical similarity between the top of the permafrost and the OAL, and its differences with the MAL, suggest that organic matter (OM) is introduced into the permafrost through cryoturbation. All the soils showed evidence of microbial processing, such as organic acids and carboxylates, however the relative abundance of these compounds varied by soil depth. This study advances our understanding of permafrost C chemistry and the reactivity of constituent compounds. |
author2 |
Department of Energy Global Change Education Program |
format |
Article in Journal/Newspaper |
author |
Ernakovich, Jessica G. Wallenstein, Matthew D. Calderón, F.J. |
spellingShingle |
Ernakovich, Jessica G. Wallenstein, Matthew D. Calderón, F.J. Chemical Indicators of Cryoturbation and Microbial Processing throughout an Alaskan Permafrost Soil Depth Profile |
author_facet |
Ernakovich, Jessica G. Wallenstein, Matthew D. Calderón, F.J. |
author_sort |
Ernakovich, Jessica G. |
title |
Chemical Indicators of Cryoturbation and Microbial Processing throughout an Alaskan Permafrost Soil Depth Profile |
title_short |
Chemical Indicators of Cryoturbation and Microbial Processing throughout an Alaskan Permafrost Soil Depth Profile |
title_full |
Chemical Indicators of Cryoturbation and Microbial Processing throughout an Alaskan Permafrost Soil Depth Profile |
title_fullStr |
Chemical Indicators of Cryoturbation and Microbial Processing throughout an Alaskan Permafrost Soil Depth Profile |
title_full_unstemmed |
Chemical Indicators of Cryoturbation and Microbial Processing throughout an Alaskan Permafrost Soil Depth Profile |
title_sort |
chemical indicators of cryoturbation and microbial processing throughout an alaskan permafrost soil depth profile |
publisher |
Wiley |
publishDate |
2015 |
url |
http://dx.doi.org/10.2136/sssaj2014.10.0420 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.2136%2Fsssaj2014.10.0420 http://onlinelibrary.wiley.com/wol1/doi/10.2136/sssaj2014.10.0420/fullpdf |
genre |
permafrost |
genre_facet |
permafrost |
op_source |
Soil Science Society of America Journal volume 79, issue 3, page 783-793 ISSN 0361-5995 1435-0661 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.2136/sssaj2014.10.0420 |
container_title |
Soil Science Society of America Journal |
container_volume |
79 |
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3 |
container_start_page |
783 |
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793 |
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1809934631837892608 |