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These have shown a surprising divergence in \u0394\n                          <jats:sup>13<\/jats:sup>\n                          C\u2010MAP sensitivity among subcontinental regions.\n                        <\/jats:p>\n                      <\/jats:list-item>\n                      <jats:list-item>\n                        <jats:p>\n                          We analysed previously reported data alongside new measurements from a transect in northeastern Queensland to explore potential drivers of regional\u2010scale \u0394\n                          <jats:sup>13<\/jats:sup>\n                          C\u2010MAP sensitivity.\n                        <\/jats:p>\n                      <\/jats:list-item>\n                      <jats:list-item>\n                        <jats:p>\n                          Multiple lines of evidence indicated this sensitivity is related to soil phosphorus. In phosphorus\u2010poor regions, \u0394\n                          <jats:sup>13<\/jats:sup>\n                          C decreased less with decreasing MAP than in phosphorus\u2010rich regions. Along two contrasting transects in northern Australia, \u0394\n                          <jats:sup>13<\/jats:sup>\n                          C correlated with leaf phosphorus in the phosphorus\u2010poor Northern Territory, but not in phosphorus\u2010rich northeastern Queensland, where it instead correlated with leaf nitrogen. Common garden experiments for species from phosphorus\u2010poor vs phosphorus\u2010rich regions showed contrasting relationships between \u0394\n                          <jats:sup>13<\/jats:sup>\n                          C and species range MAP. Finally, using an Australia\u2010wide leaf gas exchange dataset, we showed that soil phosphorus influenced the ratio of intercellular to ambient CO\n                          <jats:sub>2<\/jats:sub>\n                          concentrations (\n                          <jats:italic>c<\/jats:italic>\n                          <jats:sub>i<\/jats:sub>\n                          \u2009:\u2009\n                          <jats:italic>c<\/jats:italic>\n                          <jats:sub>a<\/jats:sub>\n                          ), which in turn controls \u0394\n                          <jats:sup>13<\/jats:sup>\n                          C; the influence was through stomatal conductance, not photosynthetic capacity.\n                        <\/jats:p>\n                      <\/jats:list-item>\n                      <jats:list-item>\n                        <jats:p>\n                          Higher stomatal conductance in phosphorus\u2010poor regions appeared to moderate the decrease in \u0394\n                          <jats:sup>13<\/jats:sup>\n                          C with decreasing precipitation. We suggest that high transpiration rates in these regions help to facilitate phosphorus foraging in phosphorus\u2010impoverished, ancient soils.\n                        <\/jats:p>\n                      <\/jats:list-item>\n                    <\/jats:list>\n                  <\/jats:p>","DOI":"10.1111\/nph.71069","type":"journal-article","created":{"date-parts":[[2026,3,20]],"date-time":"2026-03-20T06:00:58Z","timestamp":1773986458000},"page":"1038-1053","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Soil phosphorus drives subcontinental patterns of carbon isotope discrimination across Australia"],"prefix":"10.1111","volume":"251","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8504-3274","authenticated-orcid":false,"given":"Iftakharul","family":"Alam","sequence":"first","affiliation":[{"name":"College of Science and Engineering James Cook University  Cairns Qld 4878 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