采用Mann-Kendall方法分析龙江流域中上游坪洋、南阳、崩坎、磁窑4个代表站1959—2018年近60 a的降水变化趋势及突变特征,结果表明:① 龙江流域各降水站多年平均降水量在2 100~2 600 mm之间,降水主要集中在汛期；② 龙江流域年降水量总体呈现下降趋势,坪洋、南阳站通过90%的显著性检验统计值,汛期降水量整体呈现下降趋势,非汛期降水整体呈现上升趋势；③ 4个代表站在1962、1975年均出现突变点,崩坎、磁窑站进入20世纪80年代后,降水突变特征点明显增多。
The Mann-Kendall method was used to analyze the precipitation trends and mutation characteristics of the four representative stations of Pingyang, Nanyang, Bengkan and Ciyao in the upper reaches of the Longjiang River Basin from 1959 to 2018. The results show that:① The average precipitation of the precipitation station in the Longjiang River Basin is between 2100-2600mm, and the precipitation is mainly concentrated in the flood season;② The annual precipitation in the Longjiang River Basin generally showed a downward trend. The Pingyang and Nanyang stations passed the statistical test of 90% significance. The precipitation in the flood season showed a downward trend as a whole, and the precipitation in the non-flood season showed an overall upward trend;③Four representative stations stood in 1962 and 1975, and there were mutation points. Bengkan and Ciyao station in 1980s, the characteristic points of precipitation mutations increased significantly.