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Aridity threshold for alpine soil nitrogen isotope signature and ecosystem nitrogen cycling

文献类型：期刊论文

作者Mao, Jinhua3; Pan, Junxiao3; Song, Lei3; Zhang, Ruiyang3; Wang, Jinsong3; Tian, Dashuan3; Wang, Quancheng3; Liao, Jiaqiang2,3; Peng, Jinlong2,3; Niu, Shuli2,3
刊名GLOBAL CHANGE BIOLOGY
出版日期2024-06-01
卷号30期号:6页码:e17357
关键词drought nitrogen cycling nitrogen limitation Qinghai-Tibetan plateau soil nitrogen availability stable nitrogen isotope
DOI10.1111/gcb.17357
产权排序1
文献子类Article
英文摘要Determination of tipping points in nitrogen (N) isotope (delta 15N) natural abundance, especially soil delta 15N, 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 delta 15N to increases in aridity and if these responses correspond well with soil N cycling remains largely unknown. In this study, we investigated soil delta 15N 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 delta 15N 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 delta 15N 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 delta 15N positively correlated with most soil N-cycling traits, suggesting that high soil delta 15N may result from the openness of soil N cycling. Conversely, in drier regions, soil delta 15N showed insignificant relationships with soil N-cycling traits and correlated well with factors, such as soil-available phosphorus and foliage delta 15N, demonstrating that pathways other than typical soil N cycling may dominate soil delta 15N under drier conditions. Overall, these results highlight that different ecosystem N-cycling processes may drive soil delta 15N along the aridity gradient, broadening our understanding of N cycling as indicated by soil delta 15N under changing drought regimes. The aridity threshold of soil delta 15N should be considered in terrestrial N-cycling models when incorporating 15N isotope signals to predict N cycling and availability under climatic dryness. Using an aridity gradient across a 3000-km transect of drylands on the Qinghai-Tibetan Plateau, we found that the effect of increasing aridity on soil delta 15N values shifted from negative to positive in both topsoil and subsoil layers. We further found different mechanisms driving soil 15N isotopes in different aridity regions. In wetter regions, high soil delta 15N mainly result from 15N fractionation during soil N cycling, whereas, in drier regions, high soil delta 15N might be attributed to other mechanisms.image
WOS关键词NATURAL-ABUNDANCE ; GLOBAL PATTERNS ; DROUGHT ; CLIMATE ; PLANT ; MINERALIZATION ; GRADIENT ; IMMOBILIZATION ; NITRIFICATION ; PRECIPITATION
WOS研究方向Biodiversity & Conservation ; Environmental Sciences & Ecology
WOS记录号WOS:001236034900001
出版者WILEY
源URL[http://ir.igsnrr.ac.cn/handle/311030/205346]  
专题生态系统网络观测与模拟院重点实验室_外文论文
通讯作者Niu, Shuli
作者单位1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Synth Res Ctr Chinese Ecosyst Res Network, Key Lab Ecosyst Network Observat & Modeling, Beijing 100101, Peoples R China
2.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing, Peoples R China
3.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing, Peoples R China
推荐引用方式
GB/T 7714		 Mao, Jinhua,Pan, Junxiao,Song, Lei,et al. Aridity threshold for alpine soil nitrogen isotope signature and ecosystem nitrogen cycling[J]. GLOBAL CHANGE BIOLOGY,2024,30(6):e17357.
APA Mao, Jinhua.,Pan, Junxiao.,Song, Lei.,Zhang, Ruiyang.,Wang, Jinsong.,...&Niu, Shuli.(2024).Aridity threshold for alpine soil nitrogen isotope signature and ecosystem nitrogen cycling.GLOBAL CHANGE BIOLOGY,30(6),e17357.
MLA Mao, Jinhua,et al."Aridity threshold for alpine soil nitrogen isotope signature and ecosystem nitrogen cycling".GLOBAL CHANGE BIOLOGY 30.6(2024):e17357.

入库方式： OAI收割

来源：地理科学与资源研究所

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