The role of temperature in the onset of the Olea europaea L. pollen season in southwestern Spain |
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Authors: | C Galán H García-Mozo P Cariñanos P Alcázar E Domínguez-Vilches |
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Institution: | (1) Departamento de Biología Vegetal, Facultad de Ciencias, Córdoba, Spain, ES |
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Abstract: | Temperature is one of the main factors affecting the flowering of Mediterranean trees. In the case of Olea europaea L., a low-temperature period prior to bud development is essential to interrupt dormancy. After that, and once a base temperature
is reached, the plant accumulates heat until flowering starts. Different methods of obtaining the best-forecast model for
the onset date of the O. europaea pollen season, using temperature as the predictive parameter, are proposed in this paper. An 18-year pollen and climatic
data series (1982–1999) from Cordoba (Spain) was used to perform the study. First a multiple-regression analysis using 15-day
average temperatures from the period prior to flowering time was tested. Second, three heat-summation methods were used, determining
the the quantities heat units (HU): accumulated daily mean temperature after deducting a threshold, growing degree-days (GDD):
proposed by Snyder J Agric Meteorol 35:353–358 (1985)] as a measure of physiological time, and accumulated maximum temperature.
In the first two, the optimum base temperature selected for heat accumulation was 12.5°C. The multiple-regression equation
for 1999 gives a 7-day delay from the observed date. The most accurate results were obtained with the GDD method, with a difference
of only 4.7 days between predicted and observed dates. The average heat accumulation expressed as GDD was 209.9°C days. The
HU method also gives good results, with no significant statistical differences between predictions and observations.
Received: 18 April 2000 / Revised: 14 September 2000 / Accepted: 19 September 2000 |
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Keywords: | Aerobiology Forecasting Olea europaea Heat summation methods |
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