Short-term variation in leaf-level water use efficiency in a tropical forest.

Autor: Davidson KJ; Department of Environmental and Climate Sciences, Brookhaven National Laboratory, Building 490A, Upton, NY, 11973, USA.; Department of Ecology and Evolution, Stony Brook University, 650 Life Sciences Building, Stony Brook, NY, 11794, USA., Lamour J; Department of Environmental and Climate Sciences, Brookhaven National Laboratory, Building 490A, Upton, NY, 11973, USA., Rogers A; Department of Environmental and Climate Sciences, Brookhaven National Laboratory, Building 490A, Upton, NY, 11973, USA., Ely KS; Department of Environmental and Climate Sciences, Brookhaven National Laboratory, Building 490A, Upton, NY, 11973, USA., Li Q; Department of Environmental and Climate Sciences, Brookhaven National Laboratory, Building 490A, Upton, NY, 11973, USA., McDowell NG; Atmospheric Sciences and Global Change Division, Pacific Northwest National Laboratory, PO Box 999, Richland, WA, 99352, USA.; School of Biological Sciences, Washington State University, PO Box 644236, Pullman, WA, 99164-4236, USA., Pivovaroff AL; Biology Division, Glendale Community College, 1500 N Verdugo Rd, Glendale, CA, 91208, USA., Wolfe BT; School of Renewable Natural Resources, Louisiana State University, Room 227, Renewable Natural Resources Bldg, Baton Rouge, LA, 70803, USA.; Smithsonian Tropical Research Institute, Apartado, 0843-03092, Balboa, Panama., Wright SJ; Smithsonian Tropical Research Institute, Apartado, 0843-03092, Balboa, Panama., Zambrano A; Smithsonian Tropical Research Institute, Apartado, 0843-03092, Balboa, Panama., Serbin SP; Department of Environmental and Climate Sciences, Brookhaven National Laboratory, Building 490A, Upton, NY, 11973, USA.
Jazyk: angličtina
Zdroj: The New phytologist [New Phytol] 2023 Mar; Vol. 237 (6), pp. 2069-2087. Date of Electronic Publication: 2023 Jan 09.
DOI: 10.1111/nph.18684
Abstrakt: The representation of stomatal regulation of transpiration and CO 2 assimilation is key to forecasting terrestrial ecosystem responses to global change. Given its importance in determining the relationship between forest productivity and climate, accurate and mechanistic model representation of the relationship between stomatal conductance (g s ) and assimilation is crucial. We assess possible physiological and mechanistic controls on the estimation of the g 1 (stomatal slope, inversely proportional to water use efficiency) and g 0 (stomatal intercept) parameters, using diurnal gas exchange surveys and leaf-level response curves of six tropical broadleaf evergreen tree species. g 1 estimated from ex situ response curves averaged 50% less than g 1 estimated from survey data. While g 0 and g 1 varied between leaves of different phenological stages, the trend was not consistent among species. We identified a diurnal trend associated with g 1 and g 0 that significantly improved model projections of diurnal trends in transpiration. The accuracy of modeled g s can be improved by accounting for variation in stomatal behavior across diurnal periods, and between measurement approaches, rather than focusing on phenological variation in stomatal behavior. Additional investigation into the primary mechanisms responsible for diurnal variation in g 1 will be required to account for this phenomenon in land-surface models.
(© 2022 The Authors. New Phytologist © 2022 New Phytologist Foundation.)
Databáze: MEDLINE
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