Beaubien E G, Freeland H J
Devonian Botanic Garden, University of Alberta, Edmonton, Canada.
Int J Biometeorol. 2000 Aug;44(2):53-9. doi: 10.1007/s004840000050.
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 Niño events and with Pacific sea-surface temperatures.
在过去的一个世纪里，加拿大西部冬季和春季的气温有所升高。近几十年来，欧洲有报道称春季植物生长提前，但北美却没有。从四个历史数据集中提取了艾伯塔省埃德蒙顿市的首次开花日期，一个春季开花指数显示植物生长逐渐提前。对于颤杨来说，线性趋势表明在上个世纪里开花提前了26天。春季开花指数与厄尔尼诺事件的发生率以及太平洋海面温度相关。
