Rodriguez-Rajo Javier, Grewling Lukasz, Stach Alicja, Smith Matt
Department of Plant Biology and Soil Sciences, Sciences Faculty of Ourense, University of Vigo, Ourense, Spain.
Ann Agric Environ Med. 2009;16(2):277-84.
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 influence 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 Poznan (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 Poznan at the beginning of November, while the end took place during the month of January) of 985 CH with a threshold temperature of -0.25 degrees C, followed by 118 GDD degrees C with a threshold temperature of 0.5 degrees C, were necessary to overcome dormancy and produce the onset of flowering. The calculated dormancy requirements, mean temperatures 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 accuracy was tested using data from 2007, and the difference between the predicted and observed dates ranged from 3-7 days.
本文的目的是通过了解主要气象参数的影响、北大西洋涛动（NAO）效应以及对打破休眠所需的冷量和热量需求的研究，确定中欧桤木开花物候机制中的主要因素。通过容积式孢子捕捉器在波兰波兹南收集了1995 - 2007年的气传花粉。2月的温度以及1月和2月的NAO平均值通常是影响桤木花粉季节时间的关键因素。打破休眠并开始开花需要985冷量单位（CH）的冷积累（在波兹南于11月初开始，1月结束），阈值温度为 - 0.25摄氏度，随后是118生长度日（GDD），阈值温度为0.5摄氏度。计算出的休眠需求、一年中四个十年的平均温度以及开花前时期记录的1月和2月平均NAO指数，用于构建线性和多元回归模型，以预测桤木花粉季节的开始日期。使用2007年的数据对其准确性进行了测试，预测日期与观测日期之间的差异在3 - 7天之间。
