中文摘要：

在 Luanhe 河盆从 1960～1989 基于每月的 降水和空气温度，标准化 降水土壤水分蒸发蒸腾损失总量索引( SPEI )和在三月、六月的时间的标准化 降水索引( SPI )可伸缩并且自我校准的帕尔默干旱严厉索引( sc-PDSI )是打算的在学习区域评估干旱。从 1960 ～ 1989 的干旱严厉的时间的变化基于不同干旱索引，和一些典型干旱事件的结果被分析并且比较被识别。干旱严厉的空间分布也根据这些索引被阴谋并且调查。结果揭示下列：不同干旱索引的表演仔细与干旱持续时间和干旱的主导的因素被联系；当蒸发和降水在干旱事件起重要作用时， SPEI 比 SPI 更精确；sc-PDSI 显示出的干旱严厉通常是比从 1960 ～ 1989 的实际干旱严厉温和的；并且干旱的进化通常根据 sc-PDSI 被推迟。这研究为早造干旱提供珍贵引用在 Luanhe 河盆的警告和缓解系统。

英文摘要：

Based on the monthly precipitation and air temperature from 1960 to 1989 in the Luanhe River Basin, the standardized precipitation evapotranspiration index （SPEI） and standardized precipitation index （SPI） at three- and six-month time scales and the self-calibrating Palmer drought severity index （sc-PDSI） were calculated to evaluate droughts in the study area. Temporal variations of the drought severity from 1960 to 1989 were analyzed and compared based on the results of different drought indices, and some typical drought events were identified. Spatial distributions of the drought severity according to the indices were also plotted and investigated. The results reveal the following： the performances of different drought indices are closely associated with the drought duration and the dominant factors of droughts; the SPEI is more accurate than the SPI when both evaporation and precipitation play important roles in drought events; the drought severity shown by the sc-PDSI is generally milder than the actual drought severity from 1960 to 1989; and the evolution of the droughts is usually delayed according to the scPDSI. This study provides valuable references for building drought early warning and mitigation systems in the Luanhe River Basin.