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250509s2025 xx |||||o 00| ||eng c |
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|a 10.1111/gcb.70229
|2 doi
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|a pubmed25n1398.xml
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|a (DE-627)NLM388033878
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|e rakwb
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|a eng
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|a Gu, Baitao
|e verfasserin
|4 aut
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|a Microbial Immobilization Shapes the Non-Linear Response of Allochthonous Nitrogen Retention to Grassland Acidification Within Soil Aggregates
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|c 2025
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
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|2 rdamedia
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|a ƒa Online-Ressource
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|2 rdacarrier
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|a Date Completed 07.05.2025
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|a Date Revised 07.05.2025
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|a published: Print
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|a Citation Status MEDLINE
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|a © 2025 John Wiley & Sons Ltd.
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|a Soil nitrogen (N) retention plays a crucial role in determining the ecosystem capacity to buffer anthropogenic N inputs and provides a sustainable N supply. However, the effect of acidification, driven by atmospheric deposition of N and sulfur (S), on the retention and fate of allochthonous N across soil aggregate size classes remains poorly understood. We utilized a soil-acidification gradient induced by 0-50 g S m-2 year-1 addition to investigate 15N recovery in soil N pools within aggregates 21 days after labeling in a Eurasian meadow. Macroaggregates showed higher 15N recovery in microbial biomass, amino acids, amino sugars, and therefore total N (TN), as well as greater sensitivity of the former two fractions to acidification compared to microaggregates. This was accompanied by higher N hydrolases and net N mineralization in macroaggregates, supporting the aggregate hierarchical theory. Under moderate acidification (pH decrease from 7 to 6), 15N retention in hydrolyzable ammonium, amino sugars, non-hydrolyzable N, and TN decreased, likely due to lower microbial immobilization and entombing of allochthonous N. Conversely, severe acidification (pH decrease below 6) enhanced 15N retention in these N fractions through stabilization of microbial necromass, revealing a non-linear relationship between acidification and 15N retention. Concentrations of autochthonous organic N fractions remained unchanged after five-year acidification. These findings underscore the mediating role of soil microbes across aggregates in allochthonous 15N retention among N fractions with contrasting bioavailability under acidification
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|a Journal Article
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|a grassland
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|a microbial necromass
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|a nitrogen cycling
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|a soil aggregate
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| 650 |
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|a sulfur deposition
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| 650 |
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|a Soil
|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 Wang, Ruzhen
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Wang, Shaodong
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Zhang, Ying
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Han, Xingguo
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Zhu, Biao
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Dijkstra, Feike A
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Jiang, Yong
|e verfasserin
|4 aut
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| 773 |
0 |
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|i Enthalten in
|t Global change biology
|d 1999
|g 31(2025), 5 vom: 07. Mai, Seite e70229
|w (DE-627)NLM098239996
|x 1365-2486
|7 nnas
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| 773 |
1 |
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|g volume:31
|g year:2025
|g number:5
|g day:07
|g month:05
|g pages:e70229
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|u http://dx.doi.org/10.1111/gcb.70229
|3 Volltext
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