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Accueil du site → Master → Etats Unis → 1993 → Water use efficiency of Opuntia ellisiana under field conditions in south Texas

Texas A&M University - Kingsville (1993)

Water use efficiency of Opuntia ellisiana under field conditions in south Texas

Han, Huien

Titre : Water use efficiency of Opuntia ellisiana under field conditions in south Texas

Auteur : Han, Huien

Université de soutenance : Texas A&M University - Kingsville

Grade : Master of Science (MS) 1993

Résumé
This study was designed to measure the water use efficiency (WUE) of an economically important, cold-hardy spineless cactus Opuntia ellisiana under field conditions by measuring above ground dry matter production, precipitation, stored soil water change in the 0 to 137.5 cm soil profile and surface runoff over a 4-year period. Dry matter production, evapotranspiration and evapotranspiration water use efficiency (WUEet) of Opuntia ellisiana were 1781 kg ha$\sp-1$, 647 mm and 3657 kg H$\sb2$O kg$\sp-1$ dry matter for the first year’s growth, and 4783 kg ha$\sp-1$, 465 mm and 982 kg H$\sb2$O kg$\sp-1$ dry matter for the second year’s growth, The maximum leaf (cladode) area index was 0.06 for the first year and 0.39 for the second year. Under similar circumstances the WUEet of Opuntia ellisiana was comparable to C$\sb4$ plants and higher than C$\sb3$ plants. Based on assumed ratios of evaporation to evapotranspiration, the transpiration water use efficiency (WUEt) of Opuntia ellisiana was 182 kg H$\sb2$O kg$\sp-1$ dry matter in the first year and 146 kg H$\sb2$O kg$\sp-1$ dry matter in the second year.

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