选取南盘江流域3个站点40年（1970年－2009年）的逐月径流资料和20个站点同期逐月降水资料，计算标准化径流指数（SSFI）和不同时间尺度的标准化降水指数（SPIn），从中选取水文干旱样本和同期的SPI进行统计分析，研究水文干旱对气象干旱的响应特征。结果表明：南盘江流域SSFI对SPI具有良好的响应关系；SSFI对SPI的响应关系随时间尺度的不同相关性不同；总体来看，流域内水文干旱对气象干旱的响应时间约为6个月。

The monthly streamflow data at 3 stations and monthly precipitation data at 20 stations of 40 years (1970 to 2009) in the Nanpan River Basin were selected to calculate the standardized streamflow index (SSFI) and standardized precipitation index (SPI) of different time scales (3,6,9,12,24 months). The SSFI for the hydrological drought samples from the computing results and SPI of the same period were selected to perform statistical analysis and then to investigate the response of hydrological droughts to climatic droughts. The results showed that (1) SSFI has good response to the SPI in the Nanpan River Basin; (2) the correlation between SSFI and SPI varies with time scale; and (3) the response time of hydrological droughts to climatic droughts is about 6 months in general.

公益性行业（水利）科研专项(201001044)；国家科技支撑计划项目（2012BAD4B00）