Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 595, Issue -, Pages 337-343Publisher
ELSEVIER
DOI: 10.1016/j.scitotenv.2017.03.279
Keywords
Atmospheric nitrogen deposition; Ammonium and nitrate nitrogen; Methane flux; Methanogens; Dry-wet alternate; Coastal wetland
Categories
Funding
- National Natural Science Foundation of China [41371257, 41573071, 41205118]
- Key Research Project of Frontier Science of Chinese Academy of Sciences [QYZDJ-SSW-DQC015]
- Natural Science Foundation of Shandong Province [ZR2016DQ12]
- Young Taishan Scholars Program of Shandong Province [tsqn20161054]
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Atmospheric nitrogen deposition caused by human activities has been receiving much attention. Here, after long-term simulated ammonium and nitrate nitrogen deposition (NH4Cl,KNO3, and NH4NO3) in the Yellow River Delta (YRD), a sensitive coastal wetland ecosystem typified by a distinct wet and dry season, methane fluxes were measured, by adopting a closed static chamber technique. The results showed that deposition of ammonium nitrogen accelerated methane emissions all year round. Ammonium nitrogen deposition transformed the YRD from a methane sink into a source during the dry season. Methanocellaceae is the only methanogen with increased abundance after the application of NH4Cl and NH4NO3, which promoted methane emissions, during the wet season. The findings suggested that Methanocellaceae may facilitate methane emissions in response to increased ammonium nitrogen deposition. Other methanogens might have profited from ammonium supplementation, such as Methanosarcinaceae. Deposition of nitrate nitrogen did not affect methane flux significantly. To the best of our knowledge, this study is the first to show that Methanocellaceae may be responsible for methane production in coastal wetland system. This study highlights the significant effect of ammonium nitrogen and slight effect of nitrate nitrogen on methane emission in the YRD and it will be helpful to understand the microbial mechanism responding to increased nitrogen deposition in the sensitive coastal wetland ecosystem. (C) 2017 Elsevier B.V. All rights reserved.
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