The role of biogenic structures on the biogeochemical functioning of mangrove constructed wetlands sediments - A mesocosm approach

MARINE POLLUTION BULLETIN

卷:60

Article

Penha-Lopes, Gil^1,2  Kristensen, Erik³  Flindt, Mogens³  Mangion, Perrine²  Bouillon, Steven⁴  Paula, Jose¹ 

[1] Univ Lisbon, Fac Ciencias, Ctr Oceanog, Lab Maritimo Guia, P-2750374 Cascais, Portugal

[2] Univ So Denmark, Inst Biol, DK-5230 Odense, Denmark

[3] Vrije Univ Brussel, Dept Analyt & Environm Chem, Brussels, Belgium

[4] Katholieke Univ Leuven, Dept Earth & Environenmental Sci, B-3001 Louvain, Belgium

关键词: Carbon mineralization;    Microbial pathways;    Constructed wetlands;    Mangrove;    Domestic sewage;    Biogenic structures;   

DOI  :  10.1016/j.marpolbul.2009.11.008

来源: Elsevier

【 摘 要 】

Benthic metabolism (measured as CO2 production) and carbon oxidation pathways were evaluated in 4 mangrove mesocosms subjected daily to seawater or 60% sewage in the absence or presence of mangrove trees and biogenic structures (pneumatophores and crab burrows). Total CO2 emission from darkened sediments devoid of biogenic structures at pristine conditions was comparable during inundation (immersion) and air exposure (emersion), although increased 2-7 times in sewage contaminated mesocosms. Biogenic structures increased low tide carbon gas emissions at contaminated (30%) and particularly pristine conditions (60%). When sewage was loaded into the mesocosms under unvegetated and planted conditions, iron reduction was substituted by sulfate reduction and contribution of aerobic respiration to total metabolism remained above 50%. Our results clearly show impacts of sewage on the partitioning of electron acceptors in mangrove sediment and confirm the importance of biogenic structures for biogeochemical functioning but also on greenhouse gases emission. (C) 2009 Elsevier Ltd. All rights reserved.

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