Trapping pollen in the tropics — Comparing modern pollen rain spectra of different pollen traps and surface samples across Andean vegetation zones
Trapping pollen in the tropics — Comparing modern pollen rain spectra of different pollen traps and surface samples across Andean vegetation zones
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DOI：
10.1016/j.revpalbo.2013.01.011
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发表时间：
2013-06
影响因子：
1.9
通讯作者：
Nele Jantz;J. Homeier;S. León-Yánez;A. Moscoso;H. Behling
中科院分区：
文献类型：
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作者：
Nele Jantz;J. Homeier;S. León-Yánez;A. Moscoso;H. Behling
现代花粉雨的分析是对化石花粉组合进行详细和全面研究的重要前提，因为它对于以更定量的方式获得有关现有花粉光谱的有价值的信息是必要的。目前，有几种采样介质用于热带环境中的现代花粉雨收集，但对其捕获特性知之甚少。我们比较了不同花粉雨采样介质沿约 100°C 的海拔梯度的现代花粉雨光谱。 1000 至约厄瓜多尔南部海拔 3300 米。覆盖的植被类型为山前森林、山地下部森林、山地上部森林和paÌ ramo。与植被相比，对 Behling 诱集装置、改进的 Oldfield 诱集装置、参考诱集装置和土壤样品的现代花粉光谱中的花粉组合组成、代表性、多样性和孢粉丰度进行了评估。所有采样介质都显示出每种植被类型的可区分的花粉光谱。对于 paÌ ramo 来说，最具特征的类群是禾本科和野牡丹科，同时还有其他不太常见的类群，例如Arcytophyllum、缬草和杜鹃花科。上部山地森林的花粉谱以野牡丹科、黄花草属和温曼属植物为主。山地下部和山前森林具有相似的光谱，其中桑科/荨麻科、野牡丹科、Alchornea 和天蚕科的比例很高。土壤样本偏向于过度代表性具有厚外壁的花粉和孢子类群，如禾本科，而具有脆弱花粉粒的类群，如桑科/荨麻科，其代表性程度低于花粉陷阱。 Behling 诱集装置和改进的 Oldfield 诱集装置在类群组成、花粉积累率和花粉类群比例以及与植被比较的花粉光谱表示方面显示出相似的模式。然而，特别是在 paÌ ramo 样本中，由于暂时干燥和多风的条件以及强烈的辐射，改良的 Oldfield 陷阱在野外一年后就解体了。因此，我们建议在有开放植被、遭受干旱期和强辐射的地区使用贝林陷阱收集现代花粉雨。在森林地区，改良后的 Oldfield 和 Behling 诱捕器显示出类似的结果。
The analysis of modern pollen rain is an important prerequisite for detailed and comprehensive studies on fossil pollen assemblages, as it is necessary for obtaining valuable information about present pollen spectra in a more quantitative way. At present, several sampling media are used for modern pollen rain collection in tropical envi-ronments, without knowing a lot about their trapping properties. We compared modern pollen rain spectra of different pollen rain sampling media along an altitudinal gradient from ca. 1000 to ca. 3300 m asl in southern Ecuador. The vegetation types covered are premontane forest, lower montane forest, upper montane forest and paÌ ramo. Pollen assemblage composition, representation, diversity and palynological abundance in the modern pollen spectra of Behling traps, modified Oldfield traps, reference traps and soil samples were assessed in com-parison to the vegetation. All sampling media showed distinguishable pollen spectra for each vegetation type. For the paÌ ramo, the most characterising taxa are Poaceae and Melastomataceae, accompanied by other, less frequent taxa such as Arcytophyllum, Valeriana and Ericaceae. The pollen spectrum of the upper montane forest is domi-nated by Melastomataceae, Hedyosmum and Weinmannia. The lower montane and premontane forests both have similar spectra, with high proportions of Moraceae/Urticaceae, Melastomataceae, Alchornea and Cecropia. Soil samples had a bias towards an over-representation of pollen and spore taxa with a thick exine, such as Poaceae, whereas taxa with fragile pollen grains, as Moraceae/Urticaceae, were represented to a lesser extent than in the pollen traps. Behling traps and modified Oldfield traps show similar patterns in taxa composition, pol-len accumulation rates and pollen taxa proportions, as well as in representation of pollen spectra in comparison with the vegetation. However, especially in the paÌ ramo samples, modified Oldfield traps were disintegrated after one year in the field, due to temporarily dry and windy conditions, as well as strong radiation. We therefore rec-ommend the use of Behling traps for the collection of modern pollen rain in areas with open vegetation, which are subjected to drought periods and strong radiation. In forested areas, modified Oldfield and Behling traps show similar results.