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Organic matter content and particle size modifications in mangrove sediments as responses to sea level rise

By Christian J Sanders, Joseph M Smoak, Mathew N Waters, Luciana M Sanders, Niva Brandini and Sambasiva R Patchineelam

Abstract

Mangroves sediments contain large reservoirs of organic material (OM) as mangrove ecosystems produce large quantities and rapidly burial OM. Sediment accumulation rates of approximately 2.0 mm year−1, based on 210Pbex dating, were estimated at the margin of two well-developed mangrove forest in southern Brazil. Regional data point to a relative sea level (RSL) rise of up to ∼4.0 mm year−1. This RSL rise in turn, may directly influence the origin and quantity of organic matter (OM) deposited along mangrove sediments. Lithostratigraphic changes show that sand deposition is replacing the mud (μm) fraction and OM content is decreasing in successively younger sediments. Sediment accumulation in coastal areas that are not keeping pace with sea level rise is potentially conducive to the observed shifts in particle size and OM content

Topics: Organic matter, deposition rate, 210Pb, dating, sedimentation rate, mangroves, Environmental Sciences
Publisher: ePublications@SCU
Year: 2012
DOI identifier: 10.1016/j.marenvres.2012.02.004
OAI identifier: oai:epubs.scu.edu.au:esm_pubs-2663
Provided by: ePublications@SCU
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