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231225s2019 xx |||||o 00| ||eng c |
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|a 10.1111/gcb.14596
|2 doi
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|a pubmed24n0980.xml
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|a (DE-627)NLM294015396
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|a (NLM)30776171
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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| 100 |
1 |
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|a Yu, Longfei
|e verfasserin
|4 aut
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| 245 |
1 |
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|a Denitrification as a major regional nitrogen sink in subtropical forest catchments
|b Evidence from multi-site dual nitrate isotopes
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|c 2019
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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| 338 |
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|a ƒa Online-Ressource
|b cr
|2 rdacarrier
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|a Date Completed 10.06.2019
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|a Date Revised 13.06.2019
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a © 2019 John Wiley & Sons Ltd.
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|a Increasing nitrogen (N) deposition in subtropical forests in south China causes N saturation, associated with significant nitrate (NO3- ) leaching. Strong N attenuation may occur in groundwater discharge zones hydrologically connected to well-drained hillslopes, as has been shown for the subtropical headwater catchment "TieShanPing", where dual NO3- isotopes indicated that groundwater discharge zones act as an important N sink and hotspot for denitrification. Here, we present a regional study reporting inorganic N fluxes over two years together with dual NO3- isotope signatures obtained in two summer campaigns from seven forested catchments in China, representing a gradient in climate and atmospheric N input. In all catchments, fluxes of dissolved inorganic N indicated efficient conversion of NH4+ to NO3- on well-drained hillslopes, and subsequent interflow of NO3- over the argic B-horizons to groundwater discharge zones. Depletion of 15 N- and 18 O-NO3- on hillslopes suggested nitrification as the main source of NO3- . In all catchments, except one of the northern sites, which had low N deposition rates, NO3- attenuation by denitrification occurred in groundwater discharge zones, as indicated by simultaneous 15 N and 18 O enrichment in residual NO3- . By contrast to the southern sites, the northern catchments lack continuous and well-developed groundwater discharge zones, explaining less efficient N removal. Using a model based on 15 NO3- signatures, we estimated denitrification fluxes from 2.4 to 21.7 kg N ha-1 year-1 for the southern sites, accounting for more than half of the observed N removal. Across the southern catchments, estimated denitrification scaled proportionally with N deposition. Together, this indicates that N removal by denitrification is an important component of the N budget of southern Chinese forests and that natural NO3- attenuation may increase with increasing N input, thus partly counteracting further aggravation of N contamination of surface waters in the region
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a groundwater discharge zone
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|a hydrological continuum
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| 650 |
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|a isotopic modelling
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| 650 |
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|a nitrification
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|a nitrogen removal
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| 650 |
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|a δ15N and δ18O of nitrate
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| 650 |
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|a Nitrates
|2 NLM
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| 650 |
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|a Nitrogen
|2 NLM
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| 650 |
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7 |
|a N762921K75
|2 NLM
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| 700 |
1 |
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|a Mulder, Jan
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Zhu, Jing
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Zhang, Xiaoshan
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Wang, Zhangwei
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Dörsch, Peter
|e verfasserin
|4 aut
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| 773 |
0 |
8 |
|i Enthalten in
|t Global change biology
|d 1999
|g 25(2019), 5 vom: 15. Mai, Seite 1765-1778
|w (DE-627)NLM098239996
|x 1365-2486
|7 nnns
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| 773 |
1 |
8 |
|g volume:25
|g year:2019
|g number:5
|g day:15
|g month:05
|g pages:1765-1778
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| 856 |
4 |
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|u http://dx.doi.org/10.1111/gcb.14596
|3 Volltext
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|d 25
|j 2019
|e 5
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|c 05
|h 1765-1778
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