期刊
ENVIRONMENTAL SCIENCE & TECHNOLOGY
卷 47, 期 23, 页码 13404-13411出版社
AMER CHEMICAL SOC
DOI: 10.1021/es403318x
关键词
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资金
- Australian Research Council [LP0991254, DP1096457]
- Melbourne Water Corporation
- Environment Protection Authority Victoria
- Monash University Sir James McNeill Foundation Postgraduate Research Scholarship
- Natural Environment Research Council (NERC) [NE/F018612/1, NE/F0122991/1, NE/G006415/1]
- commission for Scientific Research in Greenland (KVUG) [GCRC6507]
- ERC [ERC-2010-AdG20100224]
- Danish National Research Foundation [DNRF53]
- US National Science Foundation CAREER grant [EAR-0955750]
- Australian Research Council [DP1096457] Funding Source: Australian Research Council
- Division Of Earth Sciences
- Directorate For Geosciences [0955750] Funding Source: National Science Foundation
- Natural Environment Research Council [NE/H017216/1, NE/G006415/1] Funding Source: researchfish
- NERC [NE/H017216/1, NE/G006415/1] Funding Source: UKRI
Measurement of biogeochemical processes in permeable sediments (including the hyporheic zone) is difficult because of complex multidimensional advective transport. This is especially the case for nitrogen cycling, which involves several coupled redox-sensitive reactions. To provide detailed insight into the coupling between ammonification, nitrification and denitrification in stationary sand ripples, we combined the diffusion equilibrium thin layer (DET) gel technique with a computational reactive transport biogeochemical model. The former approach provided high-resolution two-dimensional distributions of NO3- and N-15-N-2 gas. The measured two-dimensional profiles correlate with computational model simulations, showing a deep pool of N-2 gas forming, and being advected to the surface below ripple peaks. Further isotope pairing calculations on these data indicate that coupled nitrification-denitrification is severely limited in permeable sediments because the flow and transport field limits interaction between oxic and anoxic pore water. The approach allowed for new detailed insight into subsurface denitrification zones in complex permeable sediments.
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