松花江区气象水文干旱演变特征
吴燕锋, 章光新

Spatio-temporal Patterns of Meteorological and Hydrological Drought in the Songhua River Area from 1961 to 2010
Yanfeng Wu, Guangxin Zhang
图5 1961~2010年松花江区的SDI-12时间变化特征
Fig.5 Temporal variation of SDI-12 series in the Songhua River Area from 1961 to 2010