University of Worcester Worcester Research and Publications

Factors Involved in the Phenological Mechanism of Alnus Flowering in Central Europe

Rodríguez Rajo, F.J., Grewling, Ł., Stach, Alicja and Smith, Matt ORCID: (2009) Factors Involved in the Phenological Mechanism of Alnus Flowering in Central Europe. Annals of Agricultural Environmental Medicine, 16 (2). pp. 277-284. ISSN Print 1232-1966 Online 1898-2263

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The objectives of this paper are to ascertain the main factors involved in the
phenological mechanism of alder flowering in Central Europe by understanding the in
fluence of the main meteorological parameters, the North Atlantic Oscillation (NAO)
effect and the study of the Chill and Heat requirements to overcome dormancy. Airborne
pollen (1995–2007) was collected in Poznań (Poland) by means a volumetric spore trap.
Temperatures for February, and January and February averages of the NAO are generally
key factors affecting the timing of the alder pollen seasons. Chilling accumulation (which
started in Poznań at the beginning of November, while the end took place during the
month of January) of 985 CH with a threshold temperature of -0.25ºC, followed by 118
GDDºC with a threshold temperature of 0.5ºC, were necessary to overcome dormancy
and produce the onset of flowering. The calculated dormancy requirements, mean tem
peratures of the four decades of the year, and January and February average NAO index
recorded during the period before flowering, were used to construct linear and multiple
regression models in order to forecast the start date of the alder pollen seasons Its ac
curacy was tested using data from 2007, and the difference between the predicted and
observed dates ranged from 3–7 days

Item Type: Article
Additional Information:

The full-text of this article can be accessed via the official URL.

Originally deposited as National Pollen and Aerobiology Research Unit (NPARU)

Uncontrolled Discrete Keywords: Alnus, dormancy, chill hours, growth degree days, modelling, North Atlantic Oscillation
Subjects: Q Science > Q Science (General)
G Geography. Anthropology. Recreation > GE Environmental Sciences
Q Science > QH Natural history > QH301 Biology
S Agriculture > SD Forestry
Divisions: College of Health, Life and Environmental Sciences > School of Science and the Environment
Related URLs:
Depositing User: Matthew Smith
Date Deposited: 07 Jan 2010 15:14
Last Modified: 08 Sep 2020 04:00

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