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

Uncontrolled 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: Academic Departments > Institute of Science and the Environment
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Depositing User: Matthew Smith
Date Deposited: 07 Jan 2010 15:14
Last Modified: 04 Jan 2017 12:56

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