Details

Autor(en) / Beteiligte

• Conley, M M
• Kimball, BA
• Brooks, T J
• Pinter, PJ Jr
• Hunsaker, D J
• Wall, W
• Adam, N R
• LaMorte, R L
• Matthias, AD
• Thompson, T L
• Leavitt, S W
• Ottman, MJ
• Cousins, AB
• Triggs, J M

Titel

CO sub(2) enrichment increases water-use efficiency in sorghum

Ist Teil von

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

Erscheinungsjahr

2001

Quelle

Wiley Online Library - AutoHoldings Journals

Beschreibungen/Notizen

• Sorghum (Sorghum bicolor) was grown for two consecutive seasons at Maricopa, AZ, USA, using the free-air CO sub(2) enrichment (FACE) approach to investigate evapotranspiration of this C4 plant at ample and limited water supplies. Crop evapotranspiration (ET) was measured using two CO sub(2) concentrations (control, c. 370 mu mol mol super(-1); FACE, ambient +200 mu mol mol super(-1)) and 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 CO sub(2) reduced 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 CO sub(2) enrichment, 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-CO sub(2) environment, water requirements for irrigated sorghum will be lower than at present, while dry-land productivity will increase, provided global warming is minimal.