Interrelationships between climate change and surface processes in the First Meander of the Yellow River since the Last Deglaciation
The First Meander of the Yellow River,an area rich in biodiversity,is highly sensitive to ecological changes in the world's high-altitude regions,in where the environmental evolution how responds to regional cli-mate change is of great important scientific significance.In view of the reconstructed results divergence of cli-mate/environment since the last deglaciation,we individually synthesized the framework process of regional cli-matic change and the history of earth surface environmental evolution,as well as further discuss the relationship between them,with the aid of the published multi-archive records.The results indicated that the regional climate became warmer and wetter during the period of 13-6 ka,with the climatic optimum of 10-6 ka,afterwards,the regional climate tended to be cold-dry owing to the declined temperature and humidity.The regional earth surface process was dominated by the fluvio-lacustrine sediments during 18-11 ka,accompanying with the weakest aeo-lian activity,whereas the aeolian activity began enhanced from 11 ka to 8 ka,along with the weakened fluvio-la-custrine process.In 8-3 ka,the paleosol is unprecedentedly developed and alpine meadow is extensively formed thereafter.An asynchronous relationship was detected between regional surface environmental and climate change,in detail,climate change positively drove regional surface processes prior to 6 ka,whereas it exerted a negative influence hereafter.Additionally,we concluded that meadow soil is a product of continuous accumula-tion of aeolian material under the context of gradually cold and dry conditions,by comparing modem and late Holocene meadow soil particle sizes,which implying a complex relationship between regional soil development and climate change.
the Last Deglaciationthe First Meander of the Yellow Riverclimate changesurface processesinterrelationship
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