用树木年轮重建博尔塔拉河流域的降水量序列

Reconstruction of Precipitation Series from Tree-ring in the Basin of Boertala River

根据采自天山北坡西段博尔塔拉河流域18个采点的树木年轮样本,建立了每个采点的3种年表。通过相关普查分析,发现年表序列与上年10月至当年7月降水相关显著。用查干哈尔尕(t+1)、依和浑迪(t、t+1)、哈夏(t+2)4个树轮标准化年表序列可较好地重建该流域392a的该时段的降水量。分析重建结果发现:在这392a中,具有较明显的5个干期和6个湿期:有2a、3a、4a、12a、29a和43a的变化准周期:在1730,1753,1778和1831年发生突变。

Established three kinds of chronological series,according to samples of the basin of Boertala River.Single correlation screen indicated that the correlation were significant between 18 tree～ring chronological series and the precipitation from October in the last year to July in the current year.These results have distinct physiological significance.Using 4 series of tree-ring standardized chronologies in Chaganhaerga(t+1),Yihehundi(t,t+1) and Haxia(t+2),the 392a precipitation series were well reconstructed,and the equation reconstructed was stable by crossing～test.The precipitation sequences analyzed are as following.In the recent 392athe precipitation reconstructed has 5 dry periods bellow its mean and 6 wet periods above its mean.The recent 392a precipitation series reconstructed from October in the last year to July in the current year in the basin of Boertala River,have significant change periods of 2a,3a,4a,12a,29a,and 43a.The abrupt changes of precipitation occurred in 1730,1753,1778,1831.