Biogeochemical cycling in an organic-rich coastal marine basin: 9. Sources and accumulation rates of vascular plant-derived organic material

Details Biogeochemical cycling in an organic-rich coastal marine basin: 9. Sources and accumulation rates of vascular plant-derived organic material Biogeochemical cycling in an organic-rich coastal marine basin: 9. Sources and accumulation rates of vascular plant-derived organic material

Nov 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987gecoa..51.2991h&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 51, Issue 11, pp.2991-3001

Physics

2

Scientific paper

The sources, degradation and burial of vascular plant debris deposited over the past several decades in the lagoonal sediments of Cape Lookout Bight, North Carolina, are quantified using alkaline cupric oxide lignin oxidation product (LOP) analysis. Non-woody angiosperms, accounting for 92 ± 32% of the recognizable sedimentary vascular plant debris, are calculated to contribute 23 ± 17% of the total organic carbon buried over the past decade (upper meter of sediment column). When combined with a previously established sedimentary organic carbon budget for this site (Martens and Klump, 1984; Martens et al. , 1987, in preparation) a vascular plant derived carbon burial rate of 26 ± 20 mole C m -2 yr -1 is calculated for this same time interval. The refractory nature and invariant depth distributions of the lignin oxidation products (LOP), when coupled with evidence for constant degradation rates of metabolizable materials, indicate that sediment accumulation at this site has been a steady state process with respect to source and burial of organic carbon since its conversion from an inner-continental shelf to a lagoonal environment during the late 1960's. Thus systematic down-core decreases in labile organic matter result from early diagenetic processes rather than input rate variations.

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