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• W1966388638 endingPage "142" @default.
• W1966388638 startingPage "129" @default.
• W1966388638 abstract "A reducing, varved sediment core and monthly (May-September) plankton and sediment trap samples from Saanich Inlet, B.C., Canada, were analyzed for their elemental, lignin and neutral sugar compositions. Total yields of lignin-derived phenols from both the sediment trap and core samples indicated less than 15% and 30%, respectively, of chemically recognizable vascular plant remains, derived predominantly from gymnosperm wood and nonwoody angiosperm tissues. The elevated vanillyl and syringyl acid/aldehyde ratios of this material compared to fresh plant material indicated that it suffered mild aerobic decomposition prior to introduction to the Inlet. Most of the remaining particular organic material was nitrogen-rich, carbohydrate-poor and apparently plankton-derived. Organic carbon, total nitrogen, and total neutral sugars and lignin phenols all exhibited decreasing concentrations with depth in a region of uniform varving (upper 15 cm) in the sediment core. All profiles exhibited particularly steep concentration decreases within the top 2 cm of sediment. First-order decay constants for all four chemical categories within the upper 14 cm of the core ranged between 0.1–0.2 yr−1. Neutral sugars were consistently the most reactive chemical class, accounting for roughly 15% of the total organic carbon turnover. Although lignin appeared to be degraded within the sediment core, this degradation was nonselective for different lignin types and did not lead to increased acid/aldehyde ratios as occur during aerobic lignin decomposition. Comparisons of the yields of individual neutral sugars from the sediment and sediment trap samples to those expected from the vascular plant component alone indicated that the vascular plant debris in the upper portion of the sediment core had lost a portion of its initial glucose, lyxose, and mannose. In contrast, rhamnose and fucose were produced by all samples in large excess of total yields expected for chemically intact vascular plant and plankton components and must have additional sources." @default.
• W1966388638 created "2016-06-24" @default.
• W1966388638 creator A5066250216 @default.
• W1966388638 creator A5075125736 @default.
• W1966388638 date "1988-01-01" @default.
• W1966388638 modified "2023-10-18" @default.
• W1966388638 title "The comparative geochemistries of lignins and carbohydrates in an anoxic fjord" @default.
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• W1966388638 doi "https://doi.org/10.1016/0016-7037(88)90062-2" @default.
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