Details

Autor(en) / Beteiligte

• Conley, Matthew M.
• Kimball, B. A.
• Brooks, T. J.
• Pinter, P. J.
• Hunsaker, D. J.
• Wall, G. W.
• Adam, N. R.
• LaMorte, R. L.
• Matthias, A. D.
• Thompson, T. L.
• Leavitt, S. W.
• Ottman, M. J.
• Cousins, A. B.
• Triggs, J. M.

Titel

CO2Enrichment Increases Water-Use Efficiency in Sorghum

Ist Teil von

• The New phytologist, 2001-08, Vol.151 (2), p.407-412

Ort / Verlag

Blackwell Science

Erscheinungsjahr

2001

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• • Sorghum (Sorghum bicolor) was grown for two consecutive seasons at Maricopa, AZ, USA, using the free-air CO2enrichment (FACE) approach to investigate evapotranspiration of this C4 plant at ample and limited water supplies. • Crop evapotranspiration (ET) was measured using two CO2concentrations (control, c. 370 μmol mol-1FACE, ambient +200 μmol mol-1and two irrigation treatments (well watered and water-limited). Volumetric soil water content was measured before and after each irrigation using neutron scattering techniques. • Averaged over both years, elevated CO2reduced cumulative ET by 10% when plants were given ample water and by 4% under severe drought stress. Water-use efficiency based on grain yield (WUE-G) increased, due to CO2enrichment, by 9% and 19% in wet and dry plots, respectively; based on total biomass, water-use efficiency (WUE-B) increased by 16% and 17% in wet and dry plots, respectively. • These data suggest that in the future high- CO2environment, water requirements for irrigated sorghum will be lower than at present, while dry-land productivity will increase, provided global warming is minimal.