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    ARTICLE

    Photosynthesis and water use efficiency of the association between Larrea tridentata (DC) Cov. and Muhlenbergia porteri Scribn

    Castellanos-Pérez1 E, AG de Soyza2, GB Donart3

    Phyton-International Journal of Experimental Botany, Vol.77, pp. 297-320, 2008, DOI:10.32604/phyton.2008.77.297

    Abstract The study was conducted in the Chihuahuan Desert Rangeland Research Center, 32 km north of Las Cruces, NM, USA. Physiological responses of the shrub Larrea tridentata (DC) Cov. and the perennial grass Muhlenbergia porteri Scribn were determined from the summer 1997 to the winter 1998-99 when they grew together. In the summer 1997, Larrea tridentata competed for water with M. porteri, as shrubs growing alone showed higher integrated photosynthesis than shrubs in competition with M. porteri following a heavy rainfall event. Larrea tridentata had lower water use efficiency (WUE) than M. porteri plants. In the summer 1998, M. porteri had greater pre-dawn xylem… More >

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