Juglans , Fraxinus , Ulmus , and Quercus ) are dominant, and the percentages of Quercus exhibit regular oscillations; and (2) after ~5700 cal yr B.P., Pinus, Betula , and Artemisia exhibit an increasing trend, and Quercus , Carpinus and Ulmus a decreasing trend.
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Synchronous 500-year oscillations of monsoon climate and human activity in Northeast Asia.
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