Five chronologies, three of which (LD, QL and AN) have acceptable quality, were obtained from five sites in Lanzhou City, including ST, LD, QL, AN and XG.

• 实验中得到了市区五个样点(ST、LD、QL、AN和XG)的树轮年表,其中LD、OL和AN三点树轮年表质量较好。