中文摘要：

采用综合气象干旱指数,利用辽宁省22个气象站点1958年-2008年逐日降水和气温资料,从干旱强度、干旱持续时间和干旱频率三方面对辽宁省近50年年际和季节干旱特征进行分析。研究结果表明：辽宁省冬季无干旱事件发生;年际、夏季和秋季干旱程度均呈现显著增加趋势,春季干旱程度略微增加;年际、春季、夏季和秋季干旱程度分别在2000年、2001年、2000年和1999年最强;辽宁省年际干旱分布特征较集中,辽东不易发生年际干旱且持续时间短,辽南发生年际干旱频繁且持续时间长;季节干旱分布特征较分散,辽东春季不易发生干旱且持续时间短,辽南和辽西夏季发生干旱频繁且持续时间长,辽宁省普遍发生秋旱较轻。研究结果与实际情况基本相符,可为辽宁省相关部门根据本地区干旱特征制定相应抗旱对策提供理论依据。

英文摘要：

Characteristics of interannual and seasonal droughts in Liaoning Province were analyzed in terms of drought intensity,drought duration,and drought frequency,and the compound index of meteorological drought and daily precipitation and temperature data at 22 weather stations during the period 1958 to 2008.Results show that over the years,the highest degree of day drought was the heavier drought.The severe drought and special drought have not happened yet.Drought never occurred in winter.Drought intensity showed a significantly increasing trend in years,summer,and autumn.Drought intensity of years,spring,summer,and autumn was strongest in 2000,2001, 2000,and 1999,respectively.There was an increasing trend in recent years from the early 2000s to 2008,in which 2005 was the only year when drought did not occur.Concerning the season drought,summer drought was found to be the most serious.1971 was the only year of the absence of drought in fifty years,followed by autumn drought and spring drought.The dryness distribution of Liaoning Province tended to be focused in some years.East Liaoning Province was less prone to drought and the drought duration was short.Dandong suffered from the lightest drought.Over the fifty years,the longest duration of drought occurred from April 28 through August 6 in 2000,101 days in total.South Liaoning suffered frequently from drought,in which,Dalian and Yingkou Cities suffered from the most serious drought.Dalian suffered from the longest drought occurring from May 4 through November in 1999.The dryness distribution of Liaoning Province tended to be more dispersed in seasons.This study provides a basis for developing appropriate measures to reduce loss from droughts in Liaoning Province.