The effect of climate conditions on inter-annual flowering variability monitored by pollen traps below the canopy in Draved Forest, Denmark
The effect of climate conditions on inter-annual flowering variability monitored by pollen traps below the canopy in Draved Forest, Denmark
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DOI：
10.1007/s00334-010-0253-3
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发表时间：
2010-08
影响因子：
2.5
通讯作者：
A. Nielsen;P. Møller;T. Giesecke;Beth Stavngaard;Sonia L. Fontana;R. Bradshaw
中科院分区：
文献类型：
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作者：
A. Nielsen;P. Møller;T. Giesecke;Beth Stavngaard;Sonia L. Fontana;R. Bradshaw
自1967年以来，丹麦地质调查局一直在监测半天然混合落叶林地砍伐森林中每年的花粉沉积。本文分析了8种常见落叶乔木花粉积累速率的变异性及其与月平均气温和降水量的关系。开花前一年的夏季高温对几个物种的花粉沉积有积极的影响。花期温度和花粉积累率之间存在正相关关系，不同树种和不同时间的降雨量对花粉积累量有正向和负向的影响。线性模型显示，每月气候参数的组合可以解释在不同物种中观察到的变化的10%到80%。林内不同诱捕器之间的一些物种的花粉积累时间序列和花粉/气候关系存在显著差异，这与诱捕器附近树木的位置有关。这突显了在一个地区使用多个陷阱进行这类研究的重要性。时间序列分析被用来检验花粉积累速率的周期性，这可能是由资源限制或内部生物因素造成的。没有发现显著的自相关关系，尽管Alnus Visinosus显示出3年周期的趋势。这些结果表明，温度和降水可能是控制被驱赶森林中树木花粉沉积年际变化的主要因素。
Since 1967 annual pollen deposition has been monitored in the semi-natural mixed deciduous woodland Draved Forest by the Geological Survey of Denmark. In this paper, we analyse the variability in pollen accumulation rates for the eight most common deciduous trees, and their relationships to monthly temperature and precipitation. High summer temperatures in the year before flowering have a positive effect on pollen deposition for several species. A positive correlation between temperatures during the flowering season and pollen accumulation rates is found forFagus sylvatica, Quercus robur, Fraxinus excelsiorandCorylus avellana.The amount of precipitation can have both positive and negative effects on pollen accumulation, depending on species and on time of year. Linear modelling showed that combinations of monthly climate parameters could explain between 10 and 80% of the variation observed in different species. There were marked differences in the time series of pollen accumulation and pollen/climate relationships for some species between traps within the forest related to the location of trees near the traps. This underlines the importance of using multiple traps in a region for this type of study. Time series analyses were used to test for cyclicity in pollen accumulation rates, which could be caused by resource limitations or internal biological factors. No significant autocorrelations were found, althoughAlnus glutinosashowed a tendency towards 3-year cyclicity. These results indicate that, with the possible exception ofAlnus glutinosa,temperature and precipitation are the main factors controlling the annual variability in pollen deposition of the trees in Draved Forest.