Long-term trends in atmospheric pollen levels in the city of Thessaloniki, Greece
Long-term trends in atmospheric pollen levels in the city of Thessaloniki, Greece
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DOI：
10.1016/j.atmosenv.2007.05.009
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发表时间：
2007-10-01
影响因子：
5
通讯作者：
Vokou, Despina
中科院分区：
文献类型：
--
作者：
Damialis, Athanasios;Halley, John M.;Vokou, Despina
我们研究了希腊第二大城市塞萨洛尼基大气花粉水平的长期趋势。根据1987-2005年期间收集的数据，我们估计了16种不同分类群的大气花粉水平趋势，每种分类群对大气花粉总浓度的贡献至少为0.5%。我们还测试了更早，更长或更高的花粉高峰季节的趋势。这些数据的显着特点是，花粉的水平一直在增加，这是真实的大多数的个人类群检查（16个）和他们的集合。平均而言，大气中的花粉浓度每十年翻一番，但对于某些物种来说，这一速度要高得多，翻一番的时间不到5年。在大气花粉浓度长期趋势率最高的类群中，有四种属于木本植物（柏科、栎属、悬铃木属、松科），只有一种属于草本植物（荨麻科）。对于花粉季节相关的属性（开始，高峰，结束和持续时间），没有系统的趋势和变化更加微妙。观察到的花粉丰度增加与气温上升相吻合，这是塞萨洛尼基同期唯一经历持续和显著变化的气象因素。我们的研究结果表明，花粉分布的变化主要是由花粉产量的增加，而不是开花物候的变化，几个物种表现出强烈的趋势可能作为预期的气候变化的生物指标。鉴于城市周围产生花粉的水库没有增加，这些结果为气候变化对植物生物群的影响提供了进一步的证据。(c)2007爱思唯尔有限公司保留所有权利。
We examined the long-term trends in pollen atmospheric levels in Thessaloniki, the second largest city of Greece. On the basis of data collected during the period 1987-2005, we estimated trends in the atmospheric pollen levels for the 16 different taxa, each of whose contribution to the total atmospheric pollen concentration was at least 0.5%. We also tested for trends towards earlier, longer or more highly peaked pollen seasons. The salient feature of these data is that the levels of pollen have been increasing; this is true for the majority of the individual taxa examined (12 out of 16) and for their aggregate. On average, the atmospheric pollen concentration is doubling every decade, but for some species the rate is much higher, with doubling times less than 5 years. Among the taxa with the highest rate of long-term trend in atmospheric pollen concentration, four belong to the group of woody plants (Cupressaceae, Quercus, Platanus, Pinaceae) and only one to that of herbs (Urticaceae). For the pollen-season-related attributes (onset, peak, end and duration), there was no systematic tendency and the changes were more nuanced. The observed increase in pollen abundance coincides with a rise in air temperature, which is the only meteorological factor to have experienced a sustained and significant change over the same period in Thessaloniki. Our results suggest that changes in pollen distributions are dominated by increases in pollen production rather than changes in flowering phenology and that several species showing strong trends might serve as bio-indicators of expected climate change. Given that the pollen-producing reservoir around the city has not increased, these results provide further evidence of the impact of climate change on plant biota. (c) 2007 Elsevier Ltd. All rights reserved.