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Vegetative bud-burst variability of European elms

机译：欧洲榆树的营养芽爆发变异性

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The bud-burst dates of clones of Ulmus minor, Ulmus glabra, and Ulmus laevis were recorded in the field during the spring of 2000, 2001 and 2002 at six locations in five European countries. Meteorological data were obtained from stations close to the plots. Thermal time to bud-burst (T) and chilling (C) were calculated. A relationship on the form T = a + b erC was fitted for each species. In the three species, winter rest release seems to be controlled by two opposite quantitative effects of the temperature, which interrelate according to an inverse exponential relation. Besides, the bud-burst date was found to be stable between years characterised by different winter thermal trends. These three Elm species have small chilling requirements. U. minor has chilling requirements lower than those of the other two species, in agreement with the more southern distribution.
机译：2000年春季，2001年和2002年春季，在五个欧洲国家的六个地方，野外发现了小榆，榆和榆的无性系的萌芽日期。气象数据是从靠近地块的站点获得的。计算了到达萌芽的热时间（T）和冷却（C）。对于每个物种，都以T = a + b erC的形式拟合关系。在这三个物种中，冬季休息的释放似乎受温度的两个相反的定量影响所控制，它们根据反指数关系相互关联。此外，发现以冬季热趋势不同为特征的年份之间的萌芽日期稳定。这三种榆树对冷藏的要求很小。与更南部的分布相一致，U。minor的冷藏要求比其他两个物种的冷藏要求低。

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