Decomposition of Juncus seeds in a valley mire (Faroe Islands) over a 900 year period

D. Yeloff, P. Blokker, S. A. Bartlett, Dmitri Mauquoy, J. Rozema, B. Van Geel

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The influence of past depositional environments on the chemistry of sub-fossil Juncus seed coats (testa) from the top I 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 C-18 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. (C) 2007 Elsevier Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)329-341
Number of pages12
JournalOrganic Geochemistry
Volume39
Issue number3
Early online date23 Dec 2007
DOIs
Publication statusPublished - Mar 2008

Keywords

  • chromatography-mass-spectrometry
  • organic-matter
  • macromolecular-composition
  • water plants
  • fatty-acids
  • fossil
  • preservation
  • lignin
  • peat
  • bog

Cite this

Decomposition of Juncus seeds in a valley mire (Faroe Islands) over a 900 year period. / Yeloff, D.; Blokker, P.; Bartlett, S. A.; Mauquoy, Dmitri; Rozema, J.; Van Geel, B.

In: Organic Geochemistry, Vol. 39, No. 3, 03.2008, p. 329-341.

Research output: Contribution to journalArticle

Yeloff, D. ; Blokker, P. ; Bartlett, S. A. ; Mauquoy, Dmitri ; Rozema, J. ; Van Geel, B. / Decomposition of Juncus seeds in a valley mire (Faroe Islands) over a 900 year period. In: Organic Geochemistry. 2008 ; Vol. 39, No. 3. pp. 329-341.
@article{e14a7eba2c9347bb9da8e5490b28ed1b,
title = "Decomposition of Juncus seeds in a valley mire (Faroe Islands) over a 900 year period",
abstract = "The influence of past depositional environments on the chemistry of sub-fossil Juncus seed coats (testa) from the top I 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 C-18 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. (C) 2007 Elsevier Ltd. All rights reserved.",
keywords = "chromatography-mass-spectrometry, organic-matter, macromolecular-composition, water plants, fatty-acids, fossil, preservation, lignin, peat, bog",
author = "D. Yeloff and P. Blokker and Bartlett, {S. A.} and Dmitri Mauquoy and J. Rozema and {Van Geel}, B.",
year = "2008",
month = "3",
doi = "10.1016/j.orggeochem.2007.12.005",
language = "English",
volume = "39",
pages = "329--341",
journal = "Organic Geochemistry",
issn = "0146-6380",
publisher = "Elsevier Limited",
number = "3",

}

TY - JOUR

T1 - Decomposition of Juncus seeds in a valley mire (Faroe Islands) over a 900 year period

AU - Yeloff, D.

AU - Blokker, P.

AU - Bartlett, S. A.

AU - Mauquoy, Dmitri

AU - Rozema, J.

AU - Van Geel, B.

PY - 2008/3

Y1 - 2008/3

N2 - The influence of past depositional environments on the chemistry of sub-fossil Juncus seed coats (testa) from the top I 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 C-18 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. (C) 2007 Elsevier Ltd. All rights reserved.

AB - The influence of past depositional environments on the chemistry of sub-fossil Juncus seed coats (testa) from the top I 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 C-18 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. (C) 2007 Elsevier Ltd. All rights reserved.

KW - chromatography-mass-spectrometry

KW - organic-matter

KW - macromolecular-composition

KW - water plants

KW - fatty-acids

KW - fossil

KW - preservation

KW - lignin

KW - peat

KW - bog

U2 - 10.1016/j.orggeochem.2007.12.005

DO - 10.1016/j.orggeochem.2007.12.005

M3 - Article

VL - 39

SP - 329

EP - 341

JO - Organic Geochemistry

JF - Organic Geochemistry

SN - 0146-6380

IS - 3

ER -