引言人们已经提出许多假说来解释整个北美东部不同地区红果云杉(Picea rubens Sarg.)的活力、生物量以及更新能力下降的原因。关于叶冬寒害的假说特別值得注意,因为多年来一直有关红果云杉林冬寒害的报道和资料,而且红果云杉对冬寒害似乎 INTRODUCTION A number of hypotheses have been proposed to account for the decline in viability, biomass, and renewal capacity of Picea rubens Sarg. In different parts of eastern North America. It is noteworthy that the hypothesis of leaf-winter chilling injury is particularly noteworthy because it has been for many years reported on the cold damage of red-cone spruce forest and information, and red spruce on the winter chill seems