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240602s2024 xx |||||o 00| ||eng c |
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|a 10.1111/gcb.17357
|2 doi
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|a pubmed24n1426.xml
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|a (DE-627)NLM373108036
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|a (NLM)38822559
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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 Mao, Jinhua
|e verfasserin
|4 aut
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| 245 |
1 |
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|a Aridity threshold for alpine soil nitrogen isotope signature and ecosystem nitrogen cycling
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| 264 |
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|c 2024
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| 336 |
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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 01.06.2024
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|a Date Revised 01.06.2024
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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 Determination of tipping points in nitrogen (N) isotope (δ15N) natural abundance, especially soil δ15N, with increasing aridity, is critical for estimating N-cycling dynamics and N limitation in terrestrial ecosystems. However, whether there are linear or nonlinear responses of soil δ15N to increases in aridity and if these responses correspond well with soil N cycling remains largely unknown. In this study, we investigated soil δ15N and soil N-cycling characteristics in both topsoil and subsoil layers along a drought gradient across a 3000-km transect of drylands on the Qinghai-Tibetan Plateau. We found that the effect of increasing aridity on soil δ15N values shifted from negative to positive with thresholds at aridity index (AI) = 0.27 and 0.29 for the topsoil and subsoil, respectively, although soil N pools and N transformation rates linearly decreased with increasing aridity in both soil layers. Furthermore, we identified markedly different correlations between soil δ15N and soil N-cycling traits above and below the AI thresholds (0.27 and 0.29 for topsoil and subsoil, respectively). Specifically, in wetter regions, soil δ15N positively correlated with most soil N-cycling traits, suggesting that high soil δ15N may result from the "openness" of soil N cycling. Conversely, in drier regions, soil δ15N showed insignificant relationships with soil N-cycling traits and correlated well with factors, such as soil-available phosphorus and foliage δ15N, demonstrating that pathways other than typical soil N cycling may dominate soil δ15N under drier conditions. Overall, these results highlight that different ecosystem N-cycling processes may drive soil δ15N along the aridity gradient, broadening our understanding of N cycling as indicated by soil δ15N under changing drought regimes. The aridity threshold of soil δ15N should be considered in terrestrial N-cycling models when incorporating 15N isotope signals to predict N cycling and availability under climatic dryness
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|a Journal Article
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|a Qinghai–Tibetan plateau
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|a drought
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| 650 |
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|a nitrogen cycling
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|a nitrogen limitation
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|a soil nitrogen availability
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|a stable nitrogen isotope
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| 650 |
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|a Soil
|2 NLM
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| 650 |
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|a Nitrogen Isotopes
|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 Pan, Junxiao
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Song, Lei
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Zhang, Ruiyang
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Wang, Jinsong
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Tian, Dashuan
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Wang, Quancheng
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Liao, Jiaqiang
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Peng, Jinlong
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Niu, Shuli
|e verfasserin
|4 aut
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| 773 |
0 |
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|i Enthalten in
|t Global change biology
|d 1999
|g 30(2024), 6 vom: 31. Juni, Seite e17357
|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:6
|g day:31
|g month:06
|g pages:e17357
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| 856 |
4 |
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|u http://dx.doi.org/10.1111/gcb.17357
|3 Volltext
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|d 30
|j 2024
|e 6
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|c 06
|h e17357
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