{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,17]],"date-time":"2026-08-17T23:35:03Z","timestamp":1787009703996,"version":"build-2736575974"},"reference-count":89,"publisher":"Oxford University Press (OUP)","issue":"7","license":[{"start":{"date-parts":[[2020,4,9]],"date-time":"2020-04-09T00:00:00Z","timestamp":1586390400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/academic.oup.com\/journals\/pages\/open_access\/funder_policies\/chorus\/standard_publication_model"}],"funder":[{"DOI":"10.13039\/501100001655","name":"German Academic Exchange Service","doi-asserted-by":"publisher","award":["57129429"],"award-info":[{"award-number":["57129429"]}],"id":[{"id":"10.13039\/501100001655","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2020,6,30]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>Due to the increase in atmospheric CO2 concentrations, the ratio of carbon fixed by assimilation to water lost by transpiration through stomatal conductance (intrinsic water-use efficiency, iWUE) shows a long-term increasing trend globally. However, the drivers of short-term (inter-annual) variability in iWUE of tropical trees are poorly understood. We studied the inter-annual variability in iWUE of three South Asian tropical moist forest tree species (Chukrasia tabularis A.Juss., Toona ciliata M. Roem. and Lagerstroemia speciosa L.) derived from tree-ring stable carbon isotope ratio (\u03b413C) in response to variations of environmental conditions. We found a significantly decreasing trend in carbon discrimination (\u039413C) and an increasing trend in iWUE in all the three species, with a species-specific long-term trend in intercellular CO2 concentration (Ci). Growing season temperatures were the main driver of inter-annual variability of iWUE in C. tabularis and L. speciosa, whereas previous year temperatures determined the iWUE variability in T. ciliata. Vapor pressure deficit was linked with iWUE only in C. tabularis. Differences in shade tolerance, tree stature and canopy position might have caused this species-specific variation in iWUE response to climate. Linear mixed effect modeling successfully simulated iWUE variability, explaining 41\u201351% of the total variance varying with species. Commonality analysis revealed that temperatures had a dominant influence on the inter-annual iWUE variability (64\u201377%) over precipitation (7\u201322%) and atmospheric CO2 concentration (3\u20136%). However, the long-term variations in iWUE were explicitly determined by the atmospheric CO2 increase (83\u201394%). Our results suggest that the elevated CO2 and concomitant global warming might have detrimental effects on gas exchange and other physiological processes in South Asian tropical moist forest trees.<\/jats:p>","DOI":"10.1093\/treephys\/tpaa043","type":"journal-article","created":{"date-parts":[[2020,3,31]],"date-time":"2020-03-31T15:17:59Z","timestamp":1585667879000},"page":"904-916","source":"Crossref","is-referenced-by-count":33,"title":["Disentangling the effects of atmospheric CO2 and climate on intrinsic water-use efficiency in South Asian tropical moist forest trees"],"prefix":"10.1093","volume":"40","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9011-2011","authenticated-orcid":false,"given":"Mizanur","family":"Rahman","sequence":"first","affiliation":[{"name":"Institute of Geography, Friedrich-Alexander University Erlangen-Nuremberg, Wetterkreuz 15, Erlangen 91058, Germany"},{"name":"Department of Forestry and Environmental Science, Shahjalal University of Science and Technology, Sylhet 3114, Bangladesh"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mahmuda","family":"Islam","sequence":"first","affiliation":[{"name":"Institute of Geography, Friedrich-Alexander University Erlangen-Nuremberg, Wetterkreuz 15, Erlangen 91058, Germany"},{"name":"Department of Forestry and Environmental Science, Shahjalal University of Science and Technology, Sylhet 3114, Bangladesh"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Aster","family":"Gebrekirstos","sequence":"first","affiliation":[{"name":"World Agroforestry Centre (ICRAF), United Nations Avenue, PO Box 30677-00100, Nairobi, Kenya"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Achim","family":"Br\u00e4uning","sequence":"first","affiliation":[{"name":"Institute of Geography, Friedrich-Alexander University Erlangen-Nuremberg, Wetterkreuz 15, Erlangen 91058, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"286","published-online":{"date-parts":[[2020,4,9]]},"reference":[{"key":"2020063008440637400_ref1","doi-asserted-by":"crossref","first-page":"178","DOI":"10.1016\/j.endeavour.2016.07.002","article-title":"CO2, the greenhouse effect and global warming: from the pioneering work of Arrhenius and Callendar to today\u2019s earth system models","volume":"40","author":"Anderson","year":"2016","journal-title":"Endeavour"},{"key":"2020063008440637400_ref3","doi-asserted-by":"crossref","first-page":"544","DOI":"10.1111\/nph.12044","article-title":"Elevated CO2 increases tree-level intrinsic water use efficiency: insights from carbon and oxygen isotope analyses in tree rings across three forest FACE sites","volume":"197","author":"Battipaglia","year":"2013","journal-title":"New Phytol"},{"key":"2020063008440637400_ref2","doi-asserted-by":"crossref","first-page":"382","DOI":"10.1111\/pce.12160","article-title":"Drought 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