摘要
根据树轮稳定碳同位素组成（δ１３Ｃｔ）序列可较灵敏地记录降水变化的事实，利用长白山红松树轮δ１３Ｃｔ序列与松花江年径流量之间的平行变化关系，重建了近２００年来松花江年径流量的变化：年径流量变化有明显的准２２年周期；１９００年之前，径流量在周期波动中呈上升趋势，１９００年之后。
Based on the fact that precipitation variation can be sensitively recorded by tree-ring stable-carbon-isotopic composition-series (δ 13 C t), we use parallel-variation relation bewteen δ 13 C t of tree-ring collected from Changbai Mountain and yearly-runoff-amount of Songhuajiang River to reconstruct a record of historic variation of yearly-runoff-amount of the recent two hundrd years. The results show:obvious quasi-22-year period existing in the yearly-runoff-amount series;historic variation of runoff amount showing going-up tendency before 1900 and going-down tendency after 1900 in association with periodic fluctuation.
