Decomposition of Juncus seeds in a valley mire (Faroe Islands) over a 900 year period
The influence of past depositional environments on the chemistry of sub-fossil Juncus seed coats (testa) from the top 1 m (corresponding to ca. 900 years of peat accumulation) of a peat bog in the Faroe Islands was examined. The chemistry of the testa of fresh Juncus seeds were characterised using t...
Published in: | Organic Geochemistry |
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2008
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Online Access: | https://dare.uva.nl/personal/pure/en/publications/decomposition-of-juncus-seeds-in-a-valley-mire-faroe-islands-over-a-900-year-period(14366fb4-110f-416d-b95a-7ef3242f1e00).html https://doi.org/10.1016/j.orggeochem.2007.12.005 |
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ftunivamstpubl:oai:dare.uva.nl:openaire_cris_publications/14366fb4-110f-416d-b95a-7ef3242f1e00 2024-09-30T14:34:41+00:00 Decomposition of Juncus seeds in a valley mire (Faroe Islands) over a 900 year period Yeloff, D. Blokker, P. Bartlett, S.A. Mauquoy, D. Rozema, J. van Geel, B. 2008 https://dare.uva.nl/personal/pure/en/publications/decomposition-of-juncus-seeds-in-a-valley-mire-faroe-islands-over-a-900-year-period(14366fb4-110f-416d-b95a-7ef3242f1e00).html https://doi.org/10.1016/j.orggeochem.2007.12.005 und unknown https://dare.uva.nl/personal/pure/en/publications/decomposition-of-juncus-seeds-in-a-valley-mire-faroe-islands-over-a-900-year-period(14366fb4-110f-416d-b95a-7ef3242f1e00).html info:eu-repo/semantics/restrictedAccess Yeloff , D , Blokker , P , Bartlett , S A , Mauquoy , D , Rozema , J & van Geel , B 2008 , ' Decomposition of Juncus seeds in a valley mire (Faroe Islands) over a 900 year period ' , Organic Geochemistry , vol. 39 , no. 3 , pp. 329-341 . https://doi.org/10.1016/j.orggeochem.2007.12.005 article 2008 ftunivamstpubl https://doi.org/10.1016/j.orggeochem.2007.12.005 2024-09-12T16:38:35Z The influence of past depositional environments on the chemistry of sub-fossil Juncus seed coats (testa) from the top 1 m (corresponding to ca. 900 years of peat accumulation) of a peat bog in the Faroe Islands was examined. The chemistry of the testa of fresh Juncus seeds were characterised using thermally assisted pyrolysis and methylation (THM) in the presence of tetramethyl ammonium hydroxide (TMAH) and ‘type’ compounds were identified, representative of the major chemical groups in the testa (cellulose-related sugars, lignin-related phenolics, fatty acids). The abundance of the ‘type’ compounds in the products from sub-fossil testae (the internal tissues of the seeds do not survive beyond the very early stages of decomposition) was then quantified at contiguous 1 cm depth intervals. Major losses of C18 unsaturated fatty acid methyl esters and sugars were associated with the fresh to sub-fossil transition at ca. 7 cm depth. The preservation of the phenolic ferulic acid in the seed testa appears to be favoured by the input of small basaltic particles from the nearby stream channel. The mechanism by which inwash of inorganic material may be responsible for the improved chemical preservation of the Juncus seed testa is, however, unclear. The sugars were easily metabolised by microorganisms under aerobic conditions of low water table and preserved under anoxic conditions with high water table, suggesting that a drier mire surface may result in the more efficient depletion of polysaccharides and cellulose during the initial stage of decomposition in the acrotelm. Article in Journal/Newspaper Faroe Islands Universiteit van Amsterdam: Digital Academic Repository (UvA DARE) Faroe Islands Organic Geochemistry 39 3 329 341 |
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Open Polar |
collection |
Universiteit van Amsterdam: Digital Academic Repository (UvA DARE) |
op_collection_id |
ftunivamstpubl |
language |
unknown |
description |
The influence of past depositional environments on the chemistry of sub-fossil Juncus seed coats (testa) from the top 1 m (corresponding to ca. 900 years of peat accumulation) of a peat bog in the Faroe Islands was examined. The chemistry of the testa of fresh Juncus seeds were characterised using thermally assisted pyrolysis and methylation (THM) in the presence of tetramethyl ammonium hydroxide (TMAH) and ‘type’ compounds were identified, representative of the major chemical groups in the testa (cellulose-related sugars, lignin-related phenolics, fatty acids). The abundance of the ‘type’ compounds in the products from sub-fossil testae (the internal tissues of the seeds do not survive beyond the very early stages of decomposition) was then quantified at contiguous 1 cm depth intervals. Major losses of C18 unsaturated fatty acid methyl esters and sugars were associated with the fresh to sub-fossil transition at ca. 7 cm depth. The preservation of the phenolic ferulic acid in the seed testa appears to be favoured by the input of small basaltic particles from the nearby stream channel. The mechanism by which inwash of inorganic material may be responsible for the improved chemical preservation of the Juncus seed testa is, however, unclear. The sugars were easily metabolised by microorganisms under aerobic conditions of low water table and preserved under anoxic conditions with high water table, suggesting that a drier mire surface may result in the more efficient depletion of polysaccharides and cellulose during the initial stage of decomposition in the acrotelm. |
format |
Article in Journal/Newspaper |
author |
Yeloff, D. Blokker, P. Bartlett, S.A. Mauquoy, D. Rozema, J. van Geel, B. |
spellingShingle |
Yeloff, D. Blokker, P. Bartlett, S.A. Mauquoy, D. Rozema, J. van Geel, B. Decomposition of Juncus seeds in a valley mire (Faroe Islands) over a 900 year period |
author_facet |
Yeloff, D. Blokker, P. Bartlett, S.A. Mauquoy, D. Rozema, J. van Geel, B. |
author_sort |
Yeloff, D. |
title |
Decomposition of Juncus seeds in a valley mire (Faroe Islands) over a 900 year period |
title_short |
Decomposition of Juncus seeds in a valley mire (Faroe Islands) over a 900 year period |
title_full |
Decomposition of Juncus seeds in a valley mire (Faroe Islands) over a 900 year period |
title_fullStr |
Decomposition of Juncus seeds in a valley mire (Faroe Islands) over a 900 year period |
title_full_unstemmed |
Decomposition of Juncus seeds in a valley mire (Faroe Islands) over a 900 year period |
title_sort |
decomposition of juncus seeds in a valley mire (faroe islands) over a 900 year period |
publishDate |
2008 |
url |
https://dare.uva.nl/personal/pure/en/publications/decomposition-of-juncus-seeds-in-a-valley-mire-faroe-islands-over-a-900-year-period(14366fb4-110f-416d-b95a-7ef3242f1e00).html https://doi.org/10.1016/j.orggeochem.2007.12.005 |
geographic |
Faroe Islands |
geographic_facet |
Faroe Islands |
genre |
Faroe Islands |
genre_facet |
Faroe Islands |
op_source |
Yeloff , D , Blokker , P , Bartlett , S A , Mauquoy , D , Rozema , J & van Geel , B 2008 , ' Decomposition of Juncus seeds in a valley mire (Faroe Islands) over a 900 year period ' , Organic Geochemistry , vol. 39 , no. 3 , pp. 329-341 . https://doi.org/10.1016/j.orggeochem.2007.12.005 |
op_relation |
https://dare.uva.nl/personal/pure/en/publications/decomposition-of-juncus-seeds-in-a-valley-mire-faroe-islands-over-a-900-year-period(14366fb4-110f-416d-b95a-7ef3242f1e00).html |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/j.orggeochem.2007.12.005 |
container_title |
Organic Geochemistry |
container_volume |
39 |
container_issue |
3 |
container_start_page |
329 |
op_container_end_page |
341 |
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1811638218747019264 |