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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
Emission of CO
2
and CH
4
to the atmosphere by sediments and open waters in two Tanzanian mangrove forests
Marine Ecology Progress Series, Volume 370, Year 2008
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Description
Carbon gas balance was evaluated in an anthropogenically impacted (Mtoni) and a pristine (Ras Dege) mangrove forest in Tanzania. Exchange of carbon dioxide (CO2) was measured for inundated and air-exposed sediments during day and night using in situ and laboratory incubations. In situ methane (CH4) emissions were measured in the dark during air exposure only. Emission of CO2 and CH4 from open waters (e.g. creeks) was estimated from diurnal measurements of CO2, partial pressure (pCO2) and CH4 concentrations. CO2 emission from darkened sediments devoid of biogenic structures was comparable during inundation and air exposure (28 to 115 mmol m-2 d-1) with no differences between mangrove forests. Benthic primary production was low with only occasional net uptake of CO2 by the sediments. Emissions of CH4 from air-exposed sediment were generally 3 orders of magnitude lower than for CO2. Presence of pneumatophores and crab burrows increased low tide emissions several fold. Emissions from open waters were dependent on tidal level and wind speed. Lowest emission occurred during high tide (1 to 6 mmol CO2 m-2 d-1; 10 to 80 μmol CH4 m-2 d-1) and highest during low tide (30 to 80 mmol CO2 m-2 d-1; 100 to 350 μmol CH4 m-2 d-1) when supersaturated runoff from the forest floor and porewater seepage reached the creek water. Based on global average primary production and measured gas emissions, the carbon gas balance of the 2 mangrove forests was estimated. The densely vegetated Ras Dege forest appears to be an efficient sink of greenhouse carbon gases, while extensive clear-cutting at the Mtoni forest apparently has reduced its capacity to absorb CO2, although it is seemingly still a net sink for atmospheric CO2. © Inter-Research 2008.
Authors & Co-Authors
Kristensen, Erik
Denmark, Odense
Syddansk Universitet
Flindt, M. R.
Denmark, Odense
Syddansk Universitet
Ulomi, S.
Denmark, Odense
Syddansk Universitet
Tanzania, Dar es Salaam
University of Dar es Salaam
Borges, Alberto V.
Belgium, Liege
Université de Liège
Abril, Gwénaël Yves
France, Pessac
Environnements et Paléoenvironnements Océaniques et Continentaux
Bouillon, Steven
Belgium, Brussels
Vrije Universiteit Brussel
Netherlands, Wageningen
Netherlands Institute of Ecology Nioo - Knaw
Statistics
Citations: 119
Authors: 6
Affiliations: 6
Identifiers
Doi:
10.3354/meps07642
Research Areas
Environmental
Study Locations
Tanzania