Journal
INTERNATIONAL JOURNAL OF BIOMETEOROLOGY
Volume 44, Issue 2, Pages 53-59Publisher
SPRINGER
DOI: 10.1007/s004840000050
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Warmer winter and spring temperatures have been noted over the last century in Western Canada. Earlier spring plant development in recent decades has been reported for Europe, but not for North America. The first-bloom dates for Edmonton, Alberta, were extracted from four historical data sets, and a spring flowering index showed progressively earlier development. For Populus tremuloides, a linear trend shows a 26-day shift to earlier blooming over the last century. The spring flowering index correlates with the incidence of El Nino events and with Pacific sea-surface temperatures.
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