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首页> 外文期刊>Polar biology >Vegetation patterns, pollen deposition and distribution of non-pollen palynomorphs in an ice-wedge polygon near Kytalyk (NE Siberia), with some remarks on Arctic pollen morphology
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Vegetation patterns, pollen deposition and distribution of non-pollen palynomorphs in an ice-wedge polygon near Kytalyk (NE Siberia), with some remarks on Arctic pollen morphology

机译：Kytalyk（东北西伯利亚）附近一个冰楔形多边形中的植被格局，花粉沉积和非花粉质粉体分布，并对北极花粉形态有一些评论

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摘要

In ice-wedge polygon mires, small-scaled mic-rorelief of ridges enclosing small depressions results in a short-distance vegetation mosaic. The correct recognition of these landscape elements in palaeoecological studies of peat sections in order to reconstruct their patterns and dynamics requires insight in the short-distance relationship between vegetation and pollen deposition. This paper presents an analysis of pollen surface samples in a high-resolution (1 m) transect across an ice-wedge polygon near Kytalyk (NE Siberia), including a discussion on the morphology of some critical pollen types and non-pollen palynomorphs (NPPs). We found a strong correlation between vegetation and surface elevation and a fair correspondence between pollen deposition and vegetation. Distribution of NPPs reflects surface elevation well, with algal spores dominating deep spots and testate amoebae prevailing on higher spots. Peak pollen/spore values unrelated to high species coverages (e.g. of Salix, Betula, Sphagnum, Poaceae) indicate that single plants within a population may cause the bulk of the pollen production. The absence of pollen of taxa with an important presence in the vegetation (e.g. Utricularia) must be attributable to low pollen productivity. Distributional patterns point at pollen transport by water in the polygon troughs/ depressions. Our study shows that Arctic pollen records mainly reflect short-distance vegetation patterns. Palaeose-quences consequently allow accurate reconstruction of local microtopography and its dynamics, but should not be over-interpreted in terms of changing (over)regional vegetation patterns and associated drivers.
机译：在冰楔形多边形泥潭中，围着小洼地的小规模的山脊微起伏作用导致了短距离植被镶嵌。为了在泥炭剖面的古生态学研究中正确识别这些景观要素，以重建其格局和动力学，需要洞悉植被与花粉沉积之间的短距离关系。本文介绍了在Kytalyk（NE西伯利亚）附近的冰楔形多边形中高分辨率（1 m）横断面的花粉表面样品的分析，包括对一些关键花粉类型和非花粉古粉虫（NPPs）形态的讨论。 ）。我们发现植被与表面海拔之间有很强的相关性，而花粉沉积与植被之间也有相当的对应关系。 NPP的分布很好地反映了表面高度，藻类孢子在深点占主导，而睾丸变形虫在较高点占优势。与高物种覆盖率无关的花粉/孢子峰值值（例如柳柳，桦，泥炭藓，禾本科）表明种群中的单株植物可能导致大部分花粉生产。植被中不存在重要种类的类群花粉的原因是花粉生产力低。分布模式指向水在多边形波谷/凹陷处的花粉运输。我们的研究表明，北极花粉记录主要反映了短距离的植被格局。因此，万寿菊可以精确地重建局部微形貌及其动力学，但不应因区域植被格局变化（及其相关驱动因素）而被过度解释。

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