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Leaf wax n-alkanes have been recently introduced into loess deposits for paleovegetation and paleoclimate reconstruction.However,the paleoclimate significance of some n-alkane parameters such as chain-length ratios(L/H,C27/C31,C29/C31,and(C27+C29)/(C31+C33)) remains to be clarified.In order to evaluate the validity of those proxies in loess deposits,leaf wax n-alkanes were analyzed from a northwest-southeast transect on the Chinese Loess Plateau since the Last Glacial Maximum(LGM).