Interactive effects of warming and water deficit on Shiraz vine transpiration in the Barossa Valley, Australia
Anticipating vineyard irrigation requirements in future climates is of strategic importance to maintain sustainability and wine regional identity. In the context of worldwide warming and climate-driven shifts in amount and seasonality of rainfall, we investigate the interactive effects of warming...
| Autores principales: | , , , |
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| Formato: | article |
| Lenguaje: | Inglés |
| Publicado: |
IVES
2019
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| Materias: | |
| Acceso en línea: | http://hdl.handle.net/20.500.11939/6259 http://oeno-one.eu/article/view/2141 |
| Sumario: | Anticipating vineyard irrigation requirements in future climates is of strategic importance to maintain sustainability
and wine regional identity. In the context of worldwide warming and climate-driven shifts in amount and seasonality
of rainfall, we investigate the interactive effects of warming and water deficit on Shiraz vine transpiration under the
conditions of the Barossa Valley, Australia. Transpiration of Shiraz vines was measured with thermal dissipation sap
flow probes in a factorial experiment combining two thermal (heated with open-top chambers and control at
ambient temperature) and two water regimes (wet and dry). Increased vapour pressure deficit (VPD) and canopy
size in heated vines led to higher transpiration rates in irrigated vines during the first season. However, faster
depletion of soil water by highly transpiring vines, followed by insufficient soil water replenishment by rain and
irrigation, resulted in a negative feedback on vine transpiration the following season when heated vines were more
water stressed than controls. The effect of warming was thus reversed the second season, with higher transpiration
under ambient temperature. Therefore, dry soil, we suggest, could over-ride the effect of warming on the other
variables driving transpiration (VPD, canopy size, and possibly stomatal conductance). Water scheduling will need
to incorporate increased water demand under elevated temperature to maintain grapevine production in the long
term. |
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