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231225s2021 xx |||||o 00| ||eng c |
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|a 10.1111/gcb.15836
|2 doi
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|a pubmed25n1097.xml
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|a (DE-627)NLM329261754
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|a (NLM)34382301
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|a DE-627
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|c DE-627
|e rakwb
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|a eng
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| 100 |
1 |
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|a Hupperts, Stefan F
|e verfasserin
|4 aut
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| 245 |
1 |
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|a Empirical and Earth system model estimates of boreal nitrogen fixation often differ
|b A pathway toward reconciliation
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|c 2021
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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|a ƒa Online-Ressource
|b cr
|2 rdacarrier
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|a Date Completed 01.11.2021
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|a Date Revised 01.11.2021
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a © 2021 The Authors. Global Change Biology published by John Wiley & Sons Ltd.
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|a The impacts of global environmental change on productivity in northern latitudes will be contingent on nitrogen (N) availability. In circumpolar boreal ecosystems, nonvascular plants (i.e., bryophytes) and associated N2 -fixing diazotrophs provide one of the largest known N inputs but are rarely accounted for in Earth system models. Instead, most models link N2 -fixation with the functioning of vascular plants. Neglecting nonvascular N2 -fixation may be contributing toward high uncertainty that currently hinders model predictions in northern latitudes, where nonvascular N2 -fixing plants are more common. Adequately accounting for nonvascular N2 -fixation and its drivers could subsequently improve predictions of future N availability and ultimately, productivity, in northern latitudes. Here, we review empirical evidence of boreal nonvascular N2 -fixation responses to global change factors (elevated CO2 , N deposition, warming, precipitation, and shading by vascular plants), and compare empirical findings with model predictions of N2 -fixation using nine Earth system models. The majority of empirical studies found positive effects of CO2 , warming, precipitation, or light on nonvascular N2 -fixation, but N deposition strongly downregulated N2 -fixation in most empirical studies. Furthermore, we found that the responses of N2 -fixation to elevated CO2 were generally consistent between models and very limited empirical data. In contrast, empirical-model comparisons suggest that all models we assessed, and particularly those that scale N2 -fixation with net primary productivity or evapotranspiration, may be overestimating N2 -fixation under increasing N deposition. Overestimations could generate erroneous predictions of future N stocks in boreal ecosystems unless models adequately account for the drivers of nonvascular N2 -fixation. Based on our comparisons, we recommend that models explicitly treat nonvascular N2 -fixation and that field studies include more targeted measurements to improve model structures and parameterization
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|a Journal Article
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|a Review
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|a Earth system model
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4 |
|a boreal
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4 |
|a bryophyte
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4 |
|a diazotroph
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4 |
|a elevated CO2
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| 650 |
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|a nitrogen deposition
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| 650 |
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4 |
|a nitrogen fixation
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| 650 |
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4 |
|a nonvascular
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| 650 |
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|a Nitrogen
|2 NLM
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| 650 |
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|a N762921K75
|2 NLM
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| 700 |
1 |
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|a Gerber, Stefan
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Nilsson, Marie-Charlotte
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Gundale, Michael J
|e verfasserin
|4 aut
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| 773 |
0 |
8 |
|i Enthalten in
|t Global change biology
|d 1999
|g 27(2021), 22 vom: 04. Nov., Seite 5711-5725
|w (DE-627)NLM098239996
|x 1365-2486
|7 nnas
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| 773 |
1 |
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|g volume:27
|g year:2021
|g number:22
|g day:04
|g month:11
|g pages:5711-5725
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| 856 |
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|u http://dx.doi.org/10.1111/gcb.15836
|3 Volltext
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|a AR
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|d 27
|j 2021
|e 22
|b 04
|c 11
|h 5711-5725
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