Centro de Oceanografia, Laboratório Marítimo da Guia, Faculdade de Ciências da Universidade de Lisboa, Avenida Na Senhora do Cabo, 939, 2750-374 Cascais, Portugal.
Mar Pollut Bull. 2010 Apr;60(4):560-72. doi: 10.1016/j.marpolbul.2009.11.008. Epub 2009 Dec 9.
Benthic metabolism (measured as CO(2) 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 CO(2) 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.
在 4 个红树林中观中，每天用海水或 60%的污水对其进行处理，同时存在或不存在红树林和生物结构（呼吸根和螃蟹洞穴），评估底栖代谢（以 CO2 产生量衡量）和碳氧化途径。在原始条件下，没有生物结构的黑暗沉积物在淹没（浸泡）和空气暴露（露出）时的总 CO2 排放量相当，尽管在受污水污染的中观中增加了 2-7 倍。在受污染（30%）和原始条件（60%）下，生物结构增加了低潮时的碳气体排放。当在无植被和有植被的条件下将污水加载到中观中时，铁还原被硫酸盐还原所取代，好氧呼吸对总代谢的贡献仍保持在 50%以上。我们的结果清楚地表明，污水对红树林沉积物中电子受体的分配产生了影响，并证实了生物结构对生物地球化学功能的重要性，但也对温室气体排放产生了影响。
