Transpiration and plant water relations of evergreen woody vegetation on a recently constructed artificial ecosystem under seasonally dry conditions in Western Australia
Gwenzi, Willis ， Veneklaas, Erik J. ， Bleby, Timothy M. ， Yunusa, Isa A. M. ， Hinz, Christoph
2012-10-15 HYDROLOGICAL PROCESSES 2012 26(卷), 21(期), (3281-3292页)
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Understanding transpiration and plant physiological responses to environmental conditions is crucial for the design and management of vegetated engineered covers. Engineered covers rely on sustained transpiration to reduce the risk of deep drainage into potentially hazardous wastes, thereby minimizing contamination of water resources. This study quantified temporal trends of plant water potential (?p), stomatal conductance (gs), and transpiration in a 4-year-old evergreen woody vegetation growing on an artificial sandy substrate at a mine waste disposal facility. Transpiration averaged 0.7?mm?day-1 in winter, when rainfall was frequent, but declined to 0.2?mm?day-1 in the dry summer, when the plants were quite stressed. In winter, the mean ?p was -0.6?MPa at predawn and -1.5?MPa at midday, which were much higher than the corresponding summer values of -2.0?MPa and -4.8?MPa, respectively. The gs was also higher in winter (72.195.0?mmol?m-2?s-1) than in summer (<30?mmol?m-2?s-1), and negatively correlated with ?p (p?
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