Exploring pollen percentage threshold values as an indication for the regional presence of major European trees
Exploring pollen percentage threshold values as an indication for the regional presence of major European trees
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DOI：
10.1016/j.revpalbo.2011.06.004
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发表时间：
2011-08-01
影响因子：
1.9
通讯作者：
Hicks, Sheila
中科院分区：
文献类型：
--
作者：
Lisitsyna, Olga V.;Giesecke, Thomas;Hicks, Sheila
本次调查的目的是划定花粉百分比阈值的主要欧洲树木的区域存在的指示。然后，这些值可以应用于绘制这些树木的古分布在粗略的区域尺度。对已发表文献中最常用的阈值进行简要回顾，表明了问题的复杂性和进行此类研究的必要性。花粉阈值提出的存在下的20个树种类群的调查，通过比较现代花粉数据（2195个样本收集的网站在欧洲各地）与两个来源的植物物种分布信息：修改后的地图集植物欧洲（AFE）和潜在的自然植被（PNV）的地图。对于17个分类群，现代样品经常包含其花粉的小比例（0.1-0.5%），无论样品的位置相对于该taxon. The最好的协议之间的花粉的存在和AFE和PNV图的分布信息被发现为栎，松，云杉和山毛榉。12个分类群与AFE一致的样本少至9个或多达57%，这取决于分类群，而13个分类群与PNV图一致的样本少至2个或多达52%。大多数花粉类型较好地反映了母树的AFE分布，而不是PNV分布。而水青冈、冷杉、云杉和栎属花粉的出现与PNV图中树木分布信息的相关性与AFE图中树木分布信息的相关性相同或更好。基于这个数据集，我们提出了新的阈值，最大限度地减少花粉分布外的存在，而不会大量减少正确分配的样本的数量。我们还强调，在异质数据集的花粉阈值为0.5%是一个更好的标准区域存在的树比经常选择的连续花粉曲线。(C)2011 Elsevier B. V.保留所有权利。
The aim of this investigation was to delimit pollen percentage threshold values of the major European trees as an indication of regional presence. These values can then be applied to mapping the palaeodistribution of these trees at coarse regional scales. A brief review of the most commonly applied thresholds in the published literature demonstrates the complexity of the problem and the need for this kind of study. Pollen threshold values are proposed for the presence of each of the 20 tree taxa investigated by comparing modern pollen data (2195 samples collected from a network of sites across Europe) with two sources of plant species distribution information: the modified Atlas Florae Europeae (AFE) and the map of potential natural vegetation (PNV). For 17 taxa, the modern samples frequently contain small proportions of its pollen (0.1-0.5%) regardless of the sample location with respect to the species distribution of that taxon. The best agreement between the presence of pollen and the distribution information from both AFE and the PNV map was found for Quercus, Pinus, Picea and Fagus. 12 taxa agree with AFE in as few as 9 or as many as 57% of the samples, depending upon taxon, while 13 taxa agree with the PNV map in as few as 2 or as many as 52% of the samples. Most of the pollen types reflect the AFE distribution of the parent trees better than the PNV distribution. The occurrence of pollen of Fagus, Abies, Picea and Quercus, however, relates to the tree distribution information from the PNV map as well or even better than it does to the AFE information. Based on this dataset we suggest new threshold values that minimise the presence of pollen outside the distribution, without a large reduction of the number of rightly assigned samples. We also emphasise that in heterogeneous data-sets a pollen threshold of 0.5% is a better criterion for regional presence of a tree than the often chosen continuous pollen curve. (C) 2011 Elsevier B.V. All rights reserved.