Surface Pollen Distribution and Ecological Significance in Hurleg Lake,Qaidam Basin
Hurleg Lake is a critical ecological barrier located in the desert region of the eastern Qaidam Basin,which is sensitivity to global climate change.The study of modern pollen processes in lake sediments is a prerequisite for reconstructing the evolutionary history of lake ecosystems and their responses to environmental change.Here,we systematically collected surface sediment samples from Hurleg Lake and conducted pollen analysis,revealing that the pollen assemblages were dominated by Chenopodiaceae,Poaceae,Artemisia,with a notably higher concentration in the sedimentary center of the lake and the southwestern region.Chenopodiaceae and Artemisia pollens were identified as important indicators of the shrub-dwarf shrub desert and desert steppe vegetation in the eastern Qaidam Basin,while Poaceae and Cyperaceae predominantly reflected the azonal marshes and river beach meadows around the lakeshore.Furthermore,Nitraria pollen was found to be a useful indicator of the development of the Nitraria community and lake level fluctuation on the first terrace in the northern part of the lake bank.Cerealia Poaceae and Brassicaceae pollens were identified as sensitive indicators of farming activities around the lake,while Betula and Picea pollens were primarily transported by wind.It is worth noting that pollen distribution and deposition is significantly influenced by factors such as water depth,hydrodynamic conditions,vegetation community distribution around the lake,and wind action.Our study provides important modern process data and a theo-retical basis for the accurate interpretation of pollen assemblages in lake sediments of the Qinghai-Xizang Plateau,contributing to our understanding of vegetation and environmental changes in the Qaidam Basin.
NETL
NSTL
万方数据
维普
