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Rates and pathways of benthic mineralization in extensive shrimp ponds of the Mekong delta, Vietnam

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dc.contributor Australian Institute Of Marine Science
dc.contributor Australian Inst Marine Sci
dc.contributor Australian Institute Of Marine Science (aims) en TROTT, LA ALONGI, DM TIRENDI, F 2017-03-21T01:10:53Z 2013-02-28T06:46:37Z 2013-02-28T06:46:37Z 2019-05-09T01:15:31Z 2017-03-21T01:10:53Z 2013-02-28T06:46:37Z 2013-02-28T06:46:37Z 2019-05-09T01:15:31Z 1999-05-15
dc.identifier 1485 en
dc.identifier.citation Alongi DM, Tirendi F and Trott LA (1999) Rates and pathways of benthic mineralization in extensive shrimp ponds of the Mekong Delta, Vietnam. Aquaculture. 175: 269-292. en
dc.identifier.issn 0044-8486
dc.description.abstract Benthic mineralization rates and pathways were measured in two extensive shrimp ponds of the Mekong delta, Vietnam. Sediments of both ponds were unconsolidated, oxic to suboxic silt-clays of neutral pH (6.8-7.3). Free sulfides and methane were not detected in the porewater, which was dominated by NH4+ (up to 400 mu M); other interstitial solutes were very variable among replicate cores, ponds, and sediment depths. Particulate C and N concentrations ranged from 2-8% and 0.15-0.36% by sediment dry weight (DW) with few depth differences between ponds. Pyrite was abundant (0.3-5.6% of sediment DW) in both ponds. Total carbon oxidation rates were not significantly different between the pond located separate from mangroves (separate pond) and the pond located within a mangrove forest (mixed pond). Fluxes of O-2 and CO2 (= total carbon oxidation, T-COX) were highly variable, with slow rates of CO2 release (range: 7.7-30.5 mmol m(-2) day(-1)) but higher rates of O-2 consumption (range: 9.8-135.9 mmol m(-2) day(-1)), especially in the separate pond. A budget of the contribution of the various diagenetic pathways to total carbon oxidation indicates that aerobic respiration accounted for 41-60% of T-COX, with active manganese and iron reduction in the mixed and separate ponds, respectively. No denitrification or methane flux was detected from sediments of either pond. Rates of sulfate reduction were slow (range: 0.94-2.73 mmol S m(-2) day(-1)) and highly variable, accounting for 13-26% of T-COX. Rates of solute flux across the sediment-water interface were dominated by DOC, NO2- NO3-, and Mn. There was no measurable NH4+ flux. Most light-dark bottle O-2 fluxes indicated no net benthic primary productivity. The slow rates of benthic decomposition and the dominance of oxic and suboxic pathways reflect the slow rates of organic matter input, and phytoplankton and shrimp production in these extensive ponds. (C) 1999 Elsevier Science B.V. All rights reserved.
dc.language English
dc.language en en
dc.relation.ispartof Null
dc.relation.ispartof Aquaculture - pages: 175: 269-292 en
dc.relation.uri en
dc.relation.uri en
dc.subject Oxygen
dc.subject Marine-sediments
dc.subject Organic-matter
dc.subject Sediment
dc.subject Fisheries
dc.subject Iron
dc.subject Soils
dc.subject Biogeochemistry
dc.subject Bacterial Sulfate Reduction
dc.subject Organic Matter
dc.subject Flux
dc.subject Nutrient Cycling
dc.subject Extensive Shrimp Culture
dc.subject Marine & Freshwater Biology
dc.subject Mineralization
dc.subject Decomposition
dc.subject Denitrification
dc.subject Pyrite
dc.subject Mangrove Forests
dc.subject Diagenesis
dc.title Rates and pathways of benthic mineralization in extensive shrimp ponds of the Mekong delta, Vietnam
dc.type journal article en
dc.identifier.wos WOS:000080556400007

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