反硝化
环境科学
一氧化二氮
硝化作用
环境化学
生物地球化学循环
中观
氮气循环
温室气体
土壤水分
硝酸盐
有机质
微观世界
沉积物
氮气
化学
生态学
营养物
土壤科学
古生物学
有机化学
生物
作者
R. Pinto,Gabriele Weigelhofer,Matthias Pucher,Rebecca Hood‐Nowotny,Patricia Bonin,A. G. Brito,Thomas Hein
标识
DOI:10.3389/fsoil.2022.849210
摘要
Aquatic-terrestrial interfaces may act as biogeochemical hotspots for greenhouse gas emissions, especially when exposed to frequent transitions between wet and dry phases. The study aimed to analyze the dynamics of nitrogen (N) processing along an inundation gradient from floodplain soils to river sediments and identify environmental factors affecting net nitrous oxide (N 2 O) production from different microbial sources. Intact soil and sediment cores were subject to two consecutive drying-rewetting cycles in laboratory experiments. The 15 N isotope pairing technique was used to quantify N 2 O emissions sourced from denitrification and nitrification. We observed enhanced N 2 O emissions from both nitrification and denitrification following drying events. Sites exposed to frequent drying-rewetting cycles appear less affected by drying than hydrologically more stable habitats. Fluxes from nitrification were related to the organic matter content, while fluxes from denitrification were controlled by dissolved organic matter quality changes during the drying-rewetting cycles. This study shows the potential link between carbon metabolism and N 2 O production, combining the effect of drying-rewetting cycles.
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