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<p>This paper selects sampling sections for the mainstream and tributaries of the middle and lower reaches of the Yellow River, collects river water and sediment samples during the flood season for pollen analysis, and uses methods such as Geodetector to explore the distribution characteristics and influencing factors of pollen. The results show significant variations in vegetation composition across different watersheds, leading to notable differences in both the percentage and concentration of pollen types. Pollen concentration in river water is generally higher in the mainstream compared to tributaries, while sediment pollen percentage and concentration are typically lower in the mainstream than in tributaries. The concentration of suspended solids is the most significant factor affecting pollen concentration in the Yellow River, with this effect being particularly prominent outside the Shanxi-Shaanxi Gorge. Abundant coarse sand and rapid flow velocities are likely responsible for the high suspended solids concentration and lower pollen concentration observed in the mainstream of the Shanxi-Shaanxi Gorge. In sediments, clay content is the primary factor influencing pollen concentration, and its interaction with silt and flow velocity has a more prominent influence on pollen concentration. At the Yellow River section below the Shanxi-Shaanxi Gorge, sediment pollen and clay concentrations significantly increase. The changes in pollen concentration in the river water before and after the reservoir are consistent with the suspended solids concentration, while the changes in sediment pollen concentration are consistent with the clay content. Notably, pollen concentrations in sediments decrease more significantly after passing through a reservoir compared to changes observed in river water samples. Overall, there is a strong correlation between river pollen and topsoil pollen, which can provide a reliable reflection of the broader vegetation landscape of the watershed. The findings can provide support for paleoenvironmental reconstruction using pollen from alluvial sediments or lakes with river inflows.</p>

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Spatial distribution and transport characteristics of river and sediment pollen in the middle and lower reaches of the Yellow River

  • 期刊论文

  • 发表日期：

    2025年3月18日

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  • Dexin Liu,
  • Yanfang Pan,
  • Xueli He,
  • Pengfei Wu,
  • Jianhua Ma,
  • Lei Gu

摘要

This paper selects sampling sections for the mainstream and tributaries of the middle and lower reaches of the Yellow River, collects river water and sediment samples during the flood season for pollen analysis, and uses methods such as Geodetector to explore the distribution characteristics and influencing factors of pollen. The results show significant variations in vegetation composition across different watersheds, leading to notable differences in both the percentage and concentration of pollen types. Pollen concentration in river water is generally higher in the mainstream compared to tributaries, while sediment pollen percentage and concentration are typically lower in the mainstream than in tributaries. The concentration of suspended solids is the most significant factor affecting pollen concentration in the Yellow River, with this effect being particularly prominent outside the Shanxi-Shaanxi Gorge. Abundant coarse sand and rapid flow velocities are likely responsible for the high suspended solids concentration and lower pollen concentration observed in the mainstream of the Shanxi-Shaanxi Gorge. In sediments, clay content is the primary factor influencing pollen concentration, and its interaction with silt and flow velocity has a more prominent influence on pollen concentration. At the Yellow River section below the Shanxi-Shaanxi Gorge, sediment pollen and clay concentrations significantly increase. The changes in pollen concentration in the river water before and after the reservoir are consistent with the suspended solids concentration, while the changes in sediment pollen concentration are consistent with the clay content. Notably, pollen concentrations in sediments decrease more significantly after passing through a reservoir compared to changes observed in river water samples. Overall, there is a strong correlation between river pollen and topsoil pollen, which can provide a reliable reflection of the broader vegetation landscape of the watershed. The findings can provide support for paleoenvironmental reconstruction using pollen from alluvial sediments or lakes with river inflows.