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Above‐ and below‐ground responses of C~3~–C~4~ species mixtures to elevated CO~2~ and soil water availability by JUSTIN D. DERNER; HYRUM B. JOHNSON; BRUCE A. KIMBALL; PAUL J. PINTER Jr; H. Wayne POLLEY; CHARLES R. TISCHLER; THOMAS W. BOUTTON; ROBERT L. LAMORTE; GERALD W. WALL; NEIL R. ADAM; STEVEN W. LEAVITT; MICHAEL J. OTTMAN; ALLAN D. MATTHIAS; TALBOT J. BROOKS is a Environmental Science article available to read on EtoBox.
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## Abstract We evaluated the influences of CO~2~[Control, ∼ 370 μmol mol^−1^; 200 μmol mol^−1^ above ambient applied by free‐air CO~2~ enrichment (FACE)] and soil water (Wet, Dry) on above‐ and below‐ground responses of C~3~ (cotton, G__ossypium hirsutum__) and C~4~ (sorghum, __Sorghum bicolor__) plants in monocultures and two density mixtures. In monocultures, CO~2~ enrichment increased height, leaf area, above‐ground biomass and reproductive output of cotton, but not sorghum, and was independent of soil water treatment. In mixtures, cotton, but not sorghum, above‐ground biomass and height were generally reduced compared to monocultures, across both CO~2~ and soil water treatments. Density did not affect individual plant responses of either cotton or sorghum across the other treatments. Total (cotton + sorghum) leaf area and above‐ground biomass in low‐density mixtures were similar between CO~2~ treatments, but increased by 17–21% with FACE in high‐density mixtures, due to a 121% enhancement of cotton leaf area and a 276% increase in biomass under the FACE treatment. Total root biomass in the upper 1.2 m of the soil was not influenced by CO~2~ or by soil water in monoculture or mi
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- Author
- JUSTIN D. DERNER; HYRUM B. JOHNSON; BRUCE A. KIMBALL; PAUL J. PINTER Jr; H. Wayne POLLEY; CHARLES R. TISCHLER; THOMAS W. BOUTTON; ROBERT L. LAMORTE; GERALD W. WALL; NEIL R. ADAM; STEVEN W. LEAVITT; MICHAEL J. OTTMAN; ALLAN D. MATTHIAS; TALBOT J. BROOKS
- Publisher
- John Wiley and Sons; Wiley (Blackwell Publishing); Blackwell Publishing Inc.; Wiley; Research Square (ISSN 1354-1013)
- Published
- 2003
- Language
- EN
- Field
- Environmental Science (Physical Sciences)