期刊名称：Annals of Agricultural and Environmental Medicine
印刷版ISSN：1232-1966
电子版ISSN：1898-2263
出版年度：2007
卷号：14
期号：02
页码：237-237
出版社：Institute of Agricultural Medicine in Lublin
摘要：In order to survive periods of adverse cold climatic conditions, plant requirements
are satisfi ed by means of physiological adaptations to prevent cells from freezing.
Thus, the growth of woody plants in temperate regions slows down and they enter into
a physiological state called dormancy. In order to identify the chilling and heat requirements
to overcome the dormancy period of Cupressaceae pollen type in the south of
Europe, we have carried out our study with aerobiological data from a 10-year (1996-
2005) period in Ponferrada, León (Spain). For the chilling requirements the best result
was with a threshold temperature of 7.1ºC and an average of 927 CH. Calculation of heat
requirements was carried out with maximum temperature, with 490 growth degree days
(GDD) needed, with a threshold temperature of 0ºC. We have used the 2002-2003, 2003-
2004 and 2004-2005 periods in order to determine the real validity of the model. We have
not used these years in developing the models. The dates predicted differ in only a few
days from those observed: in 2002-2003 there was a difference of 11 days, in 2003-2004
predicted and observed dates were the same, but in 2004-2005 the difference obtained
was of 43 days.
