缺氧水域
潮间带
矿化(土壤科学)
环境化学
硫酸盐
过氧化氢
铁质
活性氧
化学
有机质
生物地球化学
氧气
硫黄
海洋学
地质学
氮气
生物化学
有机化学
作者
Marit R. van Erk,Olivia M Bourceau,Chyrene Moncada,Subhajit Basu,Colleen M. Hansel,Dirk de Beer
标识
DOI:10.1038/s41467-023-35818-4
摘要
Intertidal permeable sediments are crucial sites of organic matter remineralization. These sediments likely have a large capacity to produce reactive oxygen species (ROS) because of shifting oxic-anoxic interfaces and intense iron-sulfur cycling. Here, we show that high concentrations of the ROS hydrogen peroxide are present in intertidal sediments using microsensors, and chemiluminescent analysis on extracted porewater. We furthermore investigate the effect of ROS on potential rates of microbial degradation processes in intertidal surface sediments after transient oxygenation, using slurries that transitioned from oxic to anoxic conditions. Enzymatic removal of ROS strongly increases rates of aerobic respiration, sulfate reduction and hydrogen accumulation. We conclude that ROS are formed in sediments, and subsequently moderate microbial mineralization process rates. Although sulfate reduction is completely inhibited in the oxic period, it resumes immediately upon anoxia. This study demonstrates the strong effects of ROS and transient oxygenation on the biogeochemistry of intertidal sediments.
科研通智能强力驱动
Strongly Powered by AbleSci AI