Surface pollen and its relationships with modern vegetation and climate in the Tianshan Mountains, northwestern China

Surface pollen and its relationships with modern vegetation and climate in the Tianshan Mountains, northwestern China

A dataset consisting of 70 surface pollen samples from forest, alpine meadow, alpine steppe, temperate steppe, desert steppe, shrub/semi-shrub steppe and desert sites in the Tianshan Mountains, northwestern China provides an opportunity to study the relationships between surface pollen assemblages a...

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Veröffentlicht in:Vegetation History and Archaeobotany. - Springer Science + Business Media. - 25(2016), 1, Seite 19-27
1. Verfasser: Wei, Haicheng (VerfasserIn)
Weitere Verfasser: Zhao, Yan
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2016
Zugriff auf das übergeordnete Werk:Vegetation History and Archaeobotany
Schlagworte:Biological sciences Physical sciences Environmental studies
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520 |a A dataset consisting of 70 surface pollen samples from forest, alpine meadow, alpine steppe, temperate steppe, desert steppe, shrub/semi-shrub steppe and desert sites in the Tianshan Mountains, northwestern China provides an opportunity to study the relationships between surface pollen assemblages and modern vegetation and climate in this region. Redundancy analysis (RDA), the human influence index (HII) and pollen ratios were used to facilitate analysis of the pollen data. The modern pollen assemblages are primarily composed of Picea, Artemisia, Chenopodiaceae, Poaceae, Asteraceae, Nitraria and Ephedra. The results suggest that the surface pollen assemblages of different vegetation types largely represent the modern vegetation in terms of the primary taxa and dominant types. The RDA indicates that the mean annual precipitation (MAP) and the July temperature (TJuly) are the major climate variables that control the modern pollen assemblages. Picea, Artemisia, Poaceae, Cyperaceae, Fabaceae, Asteraceae, Polygonaceae and Apiaceae pollen assemblages are positively correlated with MAP and negatively correlated with TJuly, while the pollen ratios for certain other types, such as Chenopodiaceae, Ephedra and Nitraria, are negatively correlated with MAP and positively correlated with TJuly. The arboreal/non-arboreal ratios are notably high in the forest samples, indicating a sensitive response to forest vegetation. Moreover, the Artemisia/Chenopodiaceae pollen ratios are generally correlated with the vegetation type and annual precipitation change, suggesting that these factors could be useful indicators of moisture variability in arid regions. However, it is difficult to distinguish between steppe and steppe desert based on this ratio, due partly to human disturbance. The HII is significantly correlated with certain pollen taxa, including Poaceae, Plantago, Polygonaceae and Elaeagnaceae, particularly in the alpine meadow and steppe samples. Our results have implications for interpreting the available fossil pollen data in the study region and other arid and semi-arid regions. 
540 |a © Springer-Verlag Berlin Heidelberg 2016 
650 4 |a Biological sciences  |x Biology  |x Botany  |x Palynology  |x Pollen 
650 4 |a Biological sciences  |x Biology  |x Botany  |x Plant ecology  |x Vegetation 
650 4 |a Biological sciences  |x Ecology  |x Ecological zones  |x Ecoregions  |x Steppes 
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650 4 |a Physical sciences  |x Earth sciences  |x Geography  |x Geomorphology  |x Landforms  |x Deserts 
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650 4 |a Biological sciences  |x Ecology  |x Ecosystems  |x Biomes  |x Grasslands  |x Meadows 
650 4 |a Environmental studies  |x Atmospheric sciences  |x Climatology  |x Climatic zones 
650 4 |a Physical sciences  |x Earth sciences  |x Geography  |x Geographic regions  |x Temperate regions 
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