Atmospheric CO2 concentration effects on rice water use and biomass production

Kumar Uttam, Quick William Paul, Barrios Marilou, Sta Cruz Pompe C., Dingkuhn Michaël. 2017. Atmospheric CO2 concentration effects on rice water use and biomass production. PloS One, 12 (2):e0169706, 17 p.

Journal article ; Article de revue à facteur d'impact Revue en libre accès total
Published version - Anglais
Use under authorization by the author or CIRAD.

Télécharger (1MB) | Preview

Url - jeu de données :


Liste HCERES des revues (en SHS) : oui

Thème(s) HCERES des revues (en SHS) : Psychologie-éthologie-ergonomie; Staps

Abstract : Numerous studies have addressed effects of rising atmospheric CO2 concentration on rice biomass production and yield but effects on crop water use are less well understood. Irrigated rice evapotranspiration (ET) is composed of floodwater evaporation and canopy transpiration. Crop coefficient Kc (ET over potential ET, or ETo) is crop specific according to FAO, but may decrease as CO2 concentration rises. A sunlit growth chamber experiment was conducted in the Philippines, exposing 1.44-m2 canopies of IR72 rice to four constant CO2 levels (195, 390, 780 and 1560 ppmv). Crop geometry and management emulated field conditions. In two wet (WS) and two dry (DS) seasons, final aboveground dry weight (agdw) was measured. At 390 ppmv [CO2] (current ambient level), agdw averaged 1744 g m-2, similar to field although solar radiation was only 61% of ambient. Reduction to 195 ppmv [CO2] reduced agdw to 56±5% (SE), increase to 780 ppmv increased agdw to 128±8%, and 1560 ppmv increased agdw to 142±5%. In 2013WS, crop ET was measured by weighing the water extracted daily from the chambers by the air conditioners controlling air humidity. Chamber ETo was calculated according to FAO and empirically corrected via observed pan evaporation in chamber vs. field. For 390 ppmv [CO2], Kc was about 1 during crop establishment but increased to about 3 at flowering. 195 ppmv CO2 reduced Kc, 780 ppmv increased it, but at 1560 ppmv it declined. Whole-season crop water use was 564 mm (195 ppmv), 719 mm (390 ppmv), 928 mm (780 ppmv) and 803 mm (1560 ppmv). With increasing [CO2], crop water use efficiency (WUE) gradually increased from 1.59 g kg-1 (195 ppmv) to 2.88 g kg-1 (1560 ppmv). Transpiration efficiency (TE) measured on flag leaves responded more strongly to [CO2] than WUE. Responses of some morphological traits are also reported. In conclusion, increased CO2 promotes biomass more than water use of irrigated rice, causing increased WUE, but it does not help saving water. Comparability with field conditions is discussed. The results will be used to train crop models. (Résumé d'auteur)

Mots-clés Agrovoc : Oryza sativa, Riz irrigué, CO2 atmosphérique, Dioxyde de carbone, Physiologie végétale, Besoin en eau, Utilisation de l'eau, Eau d'irrigation, Transpiration, Évapotranspiration, Potentiel hydrique, Rendement des cultures, Biomasse, Variation saisonnière, Morphologie végétale, Phénologie, Modèle mathématique, Modélisation des cultures, Changement climatique, Conservation de l'eau, Expérimentation en laboratoire

Mots-clés géographiques Agrovoc : Philippines

Classification Agris : F62 - Plant physiology - Growth and development
F60 - Plant physiology and biochemistry
U10 - Computer science, mathematics and statistics
F06 - Irrigation
F08 - Cropping patterns and systems
P40 - Meteorology and climatology

Champ stratégique Cirad : Axe 1 (2014-2018) - Agriculture écologiquement intensive

Auteurs et affiliations

  • Kumar Uttam, IRRI (PHL)
  • Quick William Paul, IRRI (PHL)
  • Barrios Marilou, IRRI (PHL)
  • Sta Cruz Pompe C., UPOU (PHL)
  • Dingkuhn Michaël, CIRAD-BIOS-UMR AGAP (PHL)

Source : Cirad-Agritrop (

View Item (staff only) View Item (staff only)

[ Page générée et mise en cache le 2021-06-06 ]