Based on the analyses of chemical elements(K,Na,Ca,Mg,etc.),total organic content(TOC) and oxygen isotope(δ18O) of two lacustrine sediment sequences from Bashang area of Hebei Province and its surrounding,(K+Ca+Na+Mg)/(Fe+Mn) was demonstrated to well indicate aridity change.δ18O and TOC were adopted as proxies of intensity of summer monsoon and vegetation cover respectively.Climatic changes of this area during 9.8-5.3 ka B.P.were reconstructed.It is shown that climate changes of both sequences were quite similar and an arid stage from 7.0-5.7 ka B.P.was detected.However,the intensity of summer monsoon did not necessary correspond with the changes of aridity,implying that precipitation brought by summer monsoon in the study area was not the major factor of aridity change.On the other hand,evapotranspiration in the marginal area of Pacific monsoon,also called summer monsoon,was deterministic to the climatic aridity.
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