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The mean residence time of leaf N (MRT<jats:sub>L<\/jats:sub>) and its two determinants, leaf lifespan and N resorption efficiency (<jats:italic>r<\/jats:italic><jats:sub>N<\/jats:sub>, the fraction of the total leaf N pool that is resorbed during leaf senescence), have been hypothesized to increase plastically with decreasing soil N fertility but this remains to be fully tested. To avoid confusion by random changes in these characteristics in a relatively narrow N fertility range, MRT<jats:sub>L<\/jats:sub>, leaf lifespan, and N resorption efficiency were measured in <jats:italic>Quercus glauca<\/jats:italic> over a broad N fertility range. In the high to moderate N fertility range, leaf lifespan and <jats:italic>r<\/jats:italic><jats:sub>N<\/jats:sub> increased with decreasing N addition rate, and thus the MRT<jats:sub>L<\/jats:sub> increased. However, in the moderate to low N fertility range, leaf lifespan increased but <jats:italic>r<\/jats:italic><jats:sub>N<\/jats:sub> decreased significantly, so MRT<jats:sub>L<\/jats:sub> decreased. The decrease in <jats:italic>r<\/jats:italic><jats:sub>N<\/jats:sub> occurred because the senesced leaf N concentration was almost constant at the lower limit while the green leaf N concentration decreased in this range. The hump\u2010shaped quadratic responses of MRT<jats:sub>L<\/jats:sub> and <jats:italic>r<\/jats:italic><jats:sub>N<\/jats:sub> along the N fertility gradient suggest that incorrect conclusions about the response of these traits to N fertility variation may be drawn from experiments that include only a few fertility levels, and N recycling within leaf canopy alone cannot achieve efficient N use in infertile environments.<\/jats:p>","DOI":"10.1111\/ppl.14519","type":"journal-article","created":{"date-parts":[[2024,9,12]],"date-time":"2024-09-12T11:04:48Z","timestamp":1726139088000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Changes in leaf lifespan, nitrogen resorption, and mean residence time of leaf nitrogen along a soil fertility gradient in an evergreen oak 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