摘要：Heat accumulation conditions of a collection of 44 grapevine cultivars currently
grown in Portugal are assessed at very high spatial resolution (~1 km) and for 1981–2015. A
Growing Degree Hours – GDH (February–October) index is used for this purpose. Three
clusters of grapevine cultivars are identified, assembling varieties with close heat
accumulation requirements (early, intermediate and late ripening). These clusters provide
more physiologically consistent information when compared to previous studies, as non-linear
plant-temperature relationships are herein taken into account. For the future climates in
Portugal, ensemble mean projections under two anthropogenic-driven scenarios (RCP4.5 and
RCP8.5, 2041–2070), from four EURO-CORDEX simulations, reveal a widespread increase
of GDH, but with spatial heterogeneities. The spatial variability throughout Portugal is
projected to decrease in GDH, with strongest increases in the coolest regions of the northeast.
The typical heat accumulation conditions of each cluster are projected to gradually shift
north-eastwards and to higher-elevation areas. An unprecedented level of detail for a large
collection of grapevine varieties in Portugal is provided, which may promote a better planning
of climate change adaptation measures in Portuguese viticulture.
其他摘要：Heat accumulation conditions of a collection of 44 grapevine cultivars currently grown in Portugal are assessed at very high spatial resolution (~1 km) and for 1981–2015. A Growing Degree Hours – GDH (February–October) index is used for this purpose. Three clusters of grapevine cultivars are identified, assembling varieties with close heat accumulation requirements (early, intermediate and late ripening). These clusters provide more physiologically consistent information when compared to previous studies, as non-linear plant-temperature relationships are herein taken into account. For the future climates in Portugal, ensemble mean projections under two anthropogenic-driven scenarios (RCP4.5 and RCP8.5, 2041–2070), from four EURO-CORDEX simulations, reveal a widespread increase of GDH, but with spatial heterogeneities. The spatial variability throughout Portugal is projected to decrease in GDH, with strongest increases in the coolest regions of the northeast. The typical heat accumulation conditions of each cluster are projected to gradually shift north-eastwards and to higher-elevation areas. An unprecedented level of detail for a large collection of grapevine varieties in Portugal is provided, which may promote a better planning of climate change adaptation measures in Portuguese viticulture.
