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Title
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Phosphorus alleviation of nitrogen-suppressed methane sink in global grasslands
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Author
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Abstract
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| Grassland ecosystems account for more than 10% of the global CH4 sink in soils. A 4-year field experiment found that addition of P alone did not affect CH4 uptake and experimental addition of N alone significantly suppressed CH4 uptake, whereas concurrent N and P additions suppressed CH4 uptake to a lesser degree. A meta-analysis including 382 data points in global grasslands corroborated these findings. Global extrapolation with an empirical modelling approach estimated that contemporary N addition suppresses CH4 sink in global grassland by 11.4% and concurrent N and P deposition alleviates this suppression to 5.8%. The P alleviation of N-suppressed CH4 sink is primarily attributed to substrate competition, defined as the competition between ammonium and CH4 for the methane mono-oxygenase enzyme. The N and P impacts on CH4 uptake indicate that projected increases in N and P depositions might substantially affect CH4 uptake and alter the global CH4 cycle. |
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Language
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English
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Source (journal)
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Ecology letters. - Oxford, 1998, currens
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Related dataset(s)
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Publication
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Hoboken
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Wiley
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2020
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ISSN
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1461-023X
[print]
1461-0248
[online]
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DOI
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10.1111/ELE.13480
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Volume/pages
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23
:5
(2020)
, p. 821-830
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ISI
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000515513100001
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Pubmed ID
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32100414
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Full text (Publisher's DOI)
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Full text (open access)
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Full text (publisher's version - intranet only)
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