Enhanced decreases in rice evapotranspiration in response to elevated atmospheric carbon dioxide under warmer environments.

Autor: Ikawa H; Hokkaido Agricultural Research Center, National Agriculture and Food Research Organization, Sapporo, Hokkaido, Japan., Hasegawa T; Tohoku Agricultural Research Center, National Agriculture and Food Research Organization, Morioka, Iwate, Japan.; Institute for Agro-Environmental Sciences, National Agriculture and Food Research Organization, Tsukuba, Ibaraki, Japan., Kumagai E; Tohoku Agricultural Research Center, National Agriculture and Food Research Organization, Morioka, Iwate, Japan.; Institute for Agro-Environmental Sciences, National Agriculture and Food Research Organization, Tsukuba, Ibaraki, Japan., Wakatsuki H; Institute for Agro-Environmental Sciences, National Agriculture and Food Research Organization, Tsukuba, Ibaraki, Japan., Sekiyama Y; Research Center for Advanced Analysis, National Agriculture and Food Research Organization, Tsukuba, Ibaraki, Japan., Nagano AJ; Faculty of Agriculture, Ryukoku University, Otsu, Japan.; Institute for Advanced Biosciences, Keio University, Tsuruoka, Japan., Kuwagata T; Institute for Agro-Environmental Sciences, National Agriculture and Food Research Organization, Tsukuba, Ibaraki, Japan.
Jazyk: angličtina
Zdroj: Plant, cell & environment [Plant Cell Environ] 2024 Sep; Vol. 47 (9), pp. 3514-3527. Date of Electronic Publication: 2024 Jun 24.
DOI: 10.1111/pce.15013
Abstrakt: A short period of exposure to elevated CO 2 is known to decrease evapotranspiration via stomatal closure. Based on theoretical evaluation of a canopy transpiration model, we hypothesized that this decrease in the evapotranspiration of rice under elevated CO 2 was greater under higher temperature conditions due to an increased sensitivity of transpiration to changes in CO 2 induced by the greater vapour pressure deficit. In a temperature gradient chamber-based experiment, a 200 ppm increase in CO 2 concentration led to 0.4 mm (-7%) and 1.5 mm (-15%) decreases in 12 h evapotranspiration under ambient temperature and high temperature (+3.7°C) conditions, respectively. Model simulations revealed that the greater vapour pressure deficit under higher temperature conditions explained the variations in the reduction of evapotranspiration observed under elevated CO 2 levels between the temperature treatments. Our study suggests the utility of a simple modelling framework for mechanistic understanding of evapotranspiration and crop energy balance system under changing environmental conditions.
(© 2024 John Wiley & Sons Ltd.)
Databáze: MEDLINE
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