{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,25]],"date-time":"2026-08-25T15:31:29Z","timestamp":1787671889324,"version":"build-2736575974"},"reference-count":78,"publisher":"Wiley","license":[{"start":{"date-parts":[[2026,8,25]],"date-time":"2026-08-25T00:00:00Z","timestamp":1787616000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"},{"start":{"date-parts":[[2026,8,25]],"date-time":"2026-08-25T00:00:00Z","timestamp":1787616000000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"funder":[{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["42373078"],"award-info":[{"award-number":["42373078"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100012226","name":"Fundamental Research Funds for the Central Universities","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100012226","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Plant Cell &amp; Environment"],"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:p>\n                    Urbanisation has fundamentally altered terrestrial nitrogen (N) cycling and created N\u2010enriched hotspots where street trees serve as essential green infrastructures. These street trees live in a distinctive environment with high\u2010level reactive N emissions and blocked soil N cycling, potentially relying on direct N uptake via stomata as an important N source. However, the spatial pattern and primary drivers governing this non\u2010root N uptake across broad climatic gradients remain elusive. Based on an analysis of leaf\u2010soil difference in stable isotope ratios (\u2206 \u03b4\n                    <jats:sup>15<\/jats:sup>\n                    N, i.e., foliar \u03b4\n                    <jats:sup>15<\/jats:sup>\n                    N\u2010topsoil \u03b4\n                    <jats:sup>15<\/jats:sup>\n                    N) across 14 large cities in China, we show that urban street trees exhibit a V\u2010shaped latitudinal pattern of isotope\u2010inferred foliar N uptake, being independent of tree health status. Specifically, the strength of isotope\u2010inferred foliar N uptake increases from subtropical to warm temperate zones and then declines toward colder regions. The spatial pattern of\u00a0foliar N uptake by urban street trees is jointly regulated by various air pollutants and total precipitation from May to August. Specifically, the isotope\u2010inferred foliar N uptake increases with higher road density (a surrogate for traffic NO\n                    <jats:sub>X<\/jats:sub>\n                    emissions) and air concentrations of NH\n                    <jats:sub>3<\/jats:sub>\n                    , O\n                    <jats:sub>3<\/jats:sub>\n                    and SO\n                    <jats:sub>2<\/jats:sub>\n                    , as well as lower precipitation. Intriguingly, the isotope\u2010inferred foliar N uptake shows a non\u2010monotonic response to CO\n                    <jats:sub>2<\/jats:sub>\n                    concentrations. Our results provide isotopic evidence for a distinctive N acquisition strategy of urban street trees and highlight significant anthropogenic effects on foliar N uptake in urbanised landscapes.\n                  <\/jats:p>","DOI":"10.1111\/pce.70838","type":"journal-article","created":{"date-parts":[[2026,8,25]],"date-time":"2026-08-25T15:02:43Z","timestamp":1787670163000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Air Pollution and Climate Regulate the Large\u2010Scale Pattern of Foliar Nitrogen Uptake by Urban Street Trees"],"prefix":"10.1111","author":[{"given":"Tao","family":"He","sequence":"first","affiliation":[{"name":"State Key Laboratory of Earth Surface Processes and Disaster Risk Reduction, Faculty of Geographical Science Beijing Normal University Beijing China"},{"name":"School of Natural Resources, Faculty of Geographical Science Beijing Normal University Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5519-0150","authenticated-orcid":false,"given":"Enzai","family":"Du","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Earth Surface Processes and Disaster Risk Reduction, Faculty of Geographical Science Beijing Normal University Beijing China"},{"name":"School of Natural Resources, Faculty of Geographical Science Beijing Normal University Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0003-6742-1790","authenticated-orcid":false,"given":"Yuehan","family":"Tian","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Earth Surface Processes and Disaster Risk Reduction, Faculty of Geographical Science Beijing Normal University Beijing China"},{"name":"School of Natural Resources, Faculty of Geographical Science Beijing Normal University Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9974-0612","authenticated-orcid":false,"given":"Wim","family":"de Vries","sequence":"additional","affiliation":[{"name":"Wageningen University and Research, Earth Systems and Global Change Group Wageningen the Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,8,25]]},"reference":[{"key":"e_1_2_9_2_1","doi-asserted-by":"crossref","first-page":"43","DOI":"10.1007\/s11270-010-0682-8","article-title":"Foliar Nitrogen Uptake From Wet Deposition and the Relation With Leaf Wettability and Water Storage Capacity","volume":"219","author":"Adriaenssens S.","year":"2011","journal-title":"Water, Air, and Soil Pollution"},{"key":"e_1_2_9_3_1","doi-asserted-by":"crossref","first-page":"124","DOI":"10.1007\/s004420050710","article-title":"Estimating the Uptake of Traffic\u2010Derived NO2 From 15N Abundance in Norway Spruce Needles","volume":"118","author":"Ammann M.","year":"1999","journal-title":"Oecologia"},{"key":"e_1_2_9_4_1","doi-asserted-by":"crossref","first-page":"1012","DOI":"10.1111\/j.1365-3040.2005.01326.x","article-title":"Oxidative Stress and Ozone: Perception, Signalling and Response","volume":"28","author":"Baier M. 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