University of Extremadura, crta. Elvas s/n, Badajoz, 06071, Spain.
Int J Biometeorol. 2011 Jan;55(1):51-65. doi: 10.1007/s00484-010-0308-2. Epub 2010 Mar 31.
Phenological studies in combination with aerobiological studies enable one to observe the relationship between the release of pollen and its presence in the atmosphere. To obtain a suitable comparison between the daily variation of airborne pollen concentrations and flowering, it is necessary for the level of accuracy of both sets of data to be as similar as possible. To analyse the correlation between locally observed flowering data and pollen counts in pollen traps in order to set pollen information forecasts, pollen was sampled using a Burkard volumetric pollen trap working continuously from May 1993. For the phenological study we selected the main pollen sources of the six pollen types most abundant in our area: Cupressaceae, Platanus, Quercus, Plantago, Olea, and Poaceae with a total of 35 species. We selected seven sites to register flowering or pollination, two with semi-natural vegetation, the rest being urban sites. The sites were visited weekly from March to June in 2007, and from January to June in 2008 and 2009. Pollen shedding was checked at each visit, and recorded as the percentage of flowers or microsporangia in that state. There was an association between flowering phenology and airborne pollen records for some of the pollen types (Platanus, Quercus, Olea and Plantago). Nevertheless, for the other types (Cupressaceae and Poaceae) the flowering and airborne pollen peaks did not coincide, with up to 1 week difference in phase. Some arguments are put forward in explanation of this phenomenon. Phenological studies have shown that airborne pollen results from both local and distant sources, although the pollen peaks usually appear when local sources are shedding the greatest amounts of pollen. Resuspension phenomena are probably more important than long-distance transport in explaining the presence of airborne pollen outside the flowering period. This information could be used to improve pollen forecasts.
物候学研究与气载孢粉学研究相结合，使人们能够观察花粉释放与其在大气中存在之间的关系。为了使气载花粉浓度的日变化与花期之间的变化得到适当的比较，两组数据的精度水平必须尽可能相似。为了分析当地观测到的花期数据与花粉陷阱中的花粉计数之间的相关性，以便设置花粉信息预测，从 1993 年 5 月开始，使用 Burkard 容量式花粉陷阱连续采样花粉。为了进行物候学研究，我们选择了我们地区六种最丰富花粉类型的主要花粉源：柏科、悬铃木、栎属、车前属、油橄榄属和禾本科，共有 35 种。我们选择了七个地点来记录开花或授粉，其中两个有半自然植被，其余的是城市地点。这些地点在 2007 年 3 月至 6 月以及 2008 年和 2009 年 1 月至 6 月期间每周进行一次访问。每次访问都检查花粉脱落情况，并记录为处于该状态的花朵或小孢子囊的百分比。对于某些花粉类型（悬铃木、栎属、油橄榄属和车前属），花期物候学与气载花粉记录之间存在关联。然而，对于其他类型（柏科和禾本科），开花期和气载花粉高峰期并不吻合，相差 1 周。对此现象提出了一些解释。物候学研究表明，气载花粉既来自本地也来自远距离的花粉源，尽管花粉高峰期通常出现在本地花粉源大量释放花粉时。再悬浮现象可能比远距离运输更能解释花期以外气载花粉的存在。这些信息可以用来改进花粉预测。
