title: Accumulation of trace metals in grey mangrove Avicennia marina fine nutritive roots: the role of rhizosphere processes.
abstract: Mangrove sediment has long been recognized as being important in restricting the mobility of contaminants in estuarine environments. To investigate the role of rhizosphere processes in the accumulation of trace metals in mangrove fine nutritive roots, the mangrove sediments and associated fine nutritive roots are collected from five major embayments of Sydney estuary (Australia) for geochemical studies. In this estuary Avicennia marina sediments are accumulating large quantities of trace metals due to presence of abundant fine sediment (<62.5 μm) and organic matter as well as anthropogenic input. Accumulation of trace metals in fine nutritive roots responds to total sediment chemistry mainly due to rhizosphere sediment geochemical processes resulting in a strong linear correlation between metal concentrations in fine nutritive roots vs. total and bio-available contents in sediments. Accumulation of trace metals in fine nutritive roots is almost always exceeds rhizosphere total sediment metal concentrations.
authors.affiliation: School of Geosciences, University of Sydney, Sydney, NSW 2006, Australia; Department of Environmental Science, University of Calcutta, Kolkata 700 019, West Bengal, India.
authors.forename: Punarbasu
authors.initials: P
authors.lastname: Chaudhuri
authors.affiliation: School of Geosciences, University of Sydney, Sydney, NSW 2006, Australia. Electronic address: bibhash.nath@sydney.edu.au.
authors.forename: Bibhash
authors.initials: B
authors.lastname: Nath
authors.affiliation: School of Geosciences, University of Sydney, Sydney, NSW 2006, Australia.
authors.forename: Gavin
authors.initials: G
authors.lastname: Birch
mesh_terms: D001315:Australia; D032407:Avicennia / Q000737:chemistry*; D004784:Environmental Monitoring; D019015:Geologic Sediments / Q000737:chemistry; D008670:Metals / Q000032:analysis*; D018517:Plant Roots / Q000737:chemistry*; D058441:Rhizosphere; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D008670:Metals; D014874:Water Pollutants, Chemical
keywords: Fine nutritive roots; Mangrove – Avicennia marina; Rhizosphere; Sydney estuary; Trace metals