[{"OA_type":"gold","month":"09","main_file_link":[{"url":"https://doi.org/10.5194/bg-19-4387-2022","open_access":"1"}],"intvolume":"        19","date_created":"2026-07-27T12:30:23Z","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","_id":"22447","day":"14","type":"journal_article","quality_controlled":"1","PlanS_conform":"1","oa":1,"DOAJ_listed":"1","article_type":"original","language":[{"iso":"eng"}],"extern":"1","oa_version":"Published Version","article_processing_charge":"No","abstract":[{"text":"Elevated atmospheric CO2 concentration is expected\r\nto increase leaf CO2 assimilation rates, thus promoting plant growth\r\nand increasing leaf area. It also decreases stomatal conductance, allowing\r\nwater savings, which have been hypothesized to drive large-scale greening,\r\nin particular in arid and semiarid climates. However, the increase in leaf\r\narea could reduce the benefits of elevated CO2 concentration through soil\r\nwater depletion. The net effect of elevated CO2 on leaf- and\r\ncanopy-level gas exchange remains uncertain. To address this question, we\r\ncompare the outcomes of a heuristic model based on the Partitioning of\r\nEquilibrium Transpiration and Assimilation (PETA) hypothesis and three model\r\nvariants based on stomatal optimization theory. Predicted relative changes in leaf-\r\nand canopy-level gas exchange rates are used as a metric of plant responses\r\nto changes in atmospheric CO2 concentration. Both model approaches predict\r\nreductions in leaf-level transpiration rate due to decreased stomatal\r\nconductance under elevated CO2, but negligible (PETA) or no\r\n(optimization) changes in canopy-level transpiration due to the compensatory\r\neffect of increased leaf area. Leaf- and canopy-level CO2 assimilation\r\nis predicted to increase, with an amplification of the CO2\r\nfertilization effect at the canopy level due to the enhanced leaf area. The\r\nexpected increase in vapour pressure deficit (VPD) under warmer conditions is\r\ngenerally predicted to decrease the sensitivity of gas exchange to\r\natmospheric CO2 concentration in both models. The consistent\r\npredictions by different models that canopy-level transpiration varies\r\nlittle under elevated CO2 due to combined stomatal conductance\r\nreduction and leaf area increase highlight the coordination of\r\nphysiological and morphological characteristics in vegetation to maximize\r\nresource use (here water) under altered climatic conditions.","lang":"eng"}],"publication_status":"published","status":"public","date_published":"2022-09-14T00:00:00Z","issue":"17","publication_identifier":{"issn":["1726-4189"]},"das_tickbox":"1","title":"Consistent responses of vegetation gas exchange to elevated atmospheric CO2 emerge from heuristic and optimization models","page":"4387-4414","fulldoi":"https://doi.org/10.5194/bg-19-4387-2022","publication":"Biogeosciences","author":[{"full_name":"Manzoni, Stefano","first_name":"Stefano","last_name":"Manzoni"},{"first_name":"Simone","full_name":"Fatichi, Simone","last_name":"Fatichi","id":"cf8e546b-a9b0-11f0-a43b-aa89ed1b56d6"},{"last_name":"Feng","full_name":"Feng, Xue","first_name":"Xue"},{"first_name":"Gabriel G.","full_name":"Katul, Gabriel G.","last_name":"Katul"},{"last_name":"Way","first_name":"Danielle","full_name":"Way, Danielle"},{"last_name":"Vico","full_name":"Vico, Giulia","first_name":"Giulia"}],"OA_place":"publisher","year":"2022","citation":{"chicago":"Manzoni, Stefano, Simone Fatichi, Xue Feng, Gabriel G. Katul, Danielle Way, and Giulia Vico. “Consistent Responses of Vegetation Gas Exchange to Elevated Atmospheric CO2 Emerge from Heuristic and Optimization Models.” <i>Biogeosciences</i>. Copernicus Publications, 2022. <a href=\"https://doi.org/10.5194/bg-19-4387-2022\">https://doi.org/10.5194/bg-19-4387-2022</a>.","ama":"Manzoni S, Fatichi S, Feng X, Katul GG, Way D, Vico G. Consistent responses of vegetation gas exchange to elevated atmospheric CO2 emerge from heuristic and optimization models. <i>Biogeosciences</i>. 2022;19(17):4387-4414. doi:<a href=\"https://doi.org/10.5194/bg-19-4387-2022\">10.5194/bg-19-4387-2022</a>","ista":"Manzoni S, Fatichi S, Feng X, Katul GG, Way D, Vico G. 2022. Consistent responses of vegetation gas exchange to elevated atmospheric CO2 emerge from heuristic and optimization models. Biogeosciences. 19(17), 4387–4414.","ieee":"S. Manzoni, S. Fatichi, X. Feng, G. G. Katul, D. Way, and G. Vico, “Consistent responses of vegetation gas exchange to elevated atmospheric CO2 emerge from heuristic and optimization models,” <i>Biogeosciences</i>, vol. 19, no. 17. Copernicus Publications, pp. 4387–4414, 2022.","mla":"Manzoni, Stefano, et al. “Consistent Responses of Vegetation Gas Exchange to Elevated Atmospheric CO2 Emerge from Heuristic and Optimization Models.” <i>Biogeosciences</i>, vol. 19, no. 17, Copernicus Publications, 2022, pp. 4387–414, doi:<a href=\"https://doi.org/10.5194/bg-19-4387-2022\">10.5194/bg-19-4387-2022</a>.","apa":"Manzoni, S., Fatichi, S., Feng, X., Katul, G. G., Way, D., &#38; Vico, G. (2022). Consistent responses of vegetation gas exchange to elevated atmospheric CO2 emerge from heuristic and optimization models. <i>Biogeosciences</i>. Copernicus Publications. <a href=\"https://doi.org/10.5194/bg-19-4387-2022\">https://doi.org/10.5194/bg-19-4387-2022</a>","short":"S. Manzoni, S. Fatichi, X. Feng, G.G. Katul, D. Way, G. Vico, Biogeosciences 19 (2022) 4387–4414."},"volume":19,"publisher":"Copernicus Publications","doi":"10.5194/bg-19-4387-2022","date_updated":"2026-07-30T10:58:52Z","scopus_import":"1"}]