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

黄河中下游河水及沉积物花粉分布与传输特征

作　　者：LIU Dexin PAN Yanfang HE Xueli WU Pengfei MA Jianhua GU Lei 刘德新;潘燕芳;何雪莉;吴朋飞;马建华;谷蕾

机构地区：[1]College of Geography and Environmental Science,Henan University,Kaifeng 475004,Henan,China [2]Key Laboratory of Geospatial Technology for the Middle and Lower Yellow River Regions,Ministry of Education,Henan University,Kaifeng 475004,Henan,China [3]Key Research Institute of Yellow River Civilization and Sustainable Development,Henan University,Kaifeng 475001,Henan,China

出　　处：《Journal of Geographical Sciences》2025年第3期552-576,共25页地理学报(英文版)

基　　金：National Natural Science Foundation of China,No.41907382;China Postdoctoral Science Foundation,No.2019M652520;Henan Postdoctoral Science Foundation,No.201902025。

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 u

关 键 词：river pollen sediment pollen spatial distribution transmission mechanism middle and lower reaches of the Yellow River 

分 类 号：P343.1[天文地球—水文科学] P467[天文地球—地球物理学] Q948[生物学—植物学]