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240528s2024 xx |||||o 00| ||eng c |
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|a 10.1111/gcb.17342
|2 doi
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|a pubmed24n1421.xml
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|a (DE-627)NLM372924859
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|a (NLM)38804198
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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 Langley, J A
|e verfasserin
|4 aut
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| 245 |
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|a Rising plant demand strengthens nitrogen limitation in tidal marsh
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|c 2024
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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
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|2 rdacarrier
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|a Date Completed 28.05.2024
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|a Date Revised 28.05.2024
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|a published: Print
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|a Citation Status MEDLINE
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|a © 2024 John Wiley & Sons Ltd.
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|a Nitrogen (N) is a limiting nutrient for primary productivity in most terrestrial ecosystems, but whether N limitation is strengthening or weakening remains controversial because both N sources and sinks are increasing in magnitude globally. Temperate marshes are exposed to greater amounts of external N inputs than most terrestrial ecosystems and more than in preindustrial times owing to their position downstream of major sources of human-derived N runoff along river mouths and estuaries. Simultaneously, ecosystem N demand may also be increasing owing to other global changes such as rising atmospheric [CO2]. Here, we used interannual variability in external drivers and variables related to exogenous supply of N, along with detailed assessments of plant growth and porewater biogeochemistry, to assess the severity of N-limitation, and to determine its causes, in a 14-year N-addition × elevated CO2 experiment. We found substantial interannual variability in porewater [N], plant growth, and experimental N effects on plant growth, but the magnitude of N pools through time varied independently of the strength of N limitation. Sea level, and secondarily salinity, related closely to interannual variability in growth of the dominant plant functional groups which drove patterns in N limitation and in porewater [N]. Experimental exposure of plants to elevated CO2 and years with high flooding strengthened N limitation for the sedge. Abiotic variables controlled plant growth, which determined the strength of N limitation for each plant species and for ecosystem productivity as a whole. We conclude that in this ecosystem, which has an open N cycle and where N inputs are likely greater than in preindustrial times, plant N demand has increased more than supply
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|a Journal Article
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|a Schoenoplectus americanus
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|a elevated CO2
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| 650 |
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4 |
|a eutrophication
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| 650 |
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|a oligotrophication
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| 650 |
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4 |
|a plant productivity
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| 650 |
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4 |
|a sea level rise
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| 650 |
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7 |
|a Nitrogen
|2 NLM
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| 650 |
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|a N762921K75
|2 NLM
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| 650 |
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|a Carbon Dioxide
|2 NLM
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| 650 |
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7 |
|a 142M471B3J
|2 NLM
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| 700 |
1 |
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|a Wang, L
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Yedman, B
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Megonigal, J P
|e verfasserin
|4 aut
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| 773 |
0 |
8 |
|i Enthalten in
|t Global change biology
|d 1999
|g 30(2024), 5 vom: 28. Mai, Seite e17342
|w (DE-627)NLM098239996
|x 1365-2486
|7 nnns
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| 773 |
1 |
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|g volume:30
|g year:2024
|g number:5
|g day:28
|g month:05
|g pages:e17342
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| 856 |
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|u http://dx.doi.org/10.1111/gcb.17342
|3 Volltext
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