干旱地区农业研究Issue(4)：236-241,6.
三种干旱指标在泾惠渠灌区的适用性分析
Suitability analysis of three drought indices in Jinghuiqu irrigation district
摘要
Abstract
In order to assess the regional drought condition accurately ,precipitation anomaly ( Pa ) ,standard pre-cipitation index (SPI) and Z index were calculated and their suitability was compared based on the precipitation data of Jinghuiqu experimental station from 1953 to 2011 . The results showed that all these indices could reflect the yearly change trends of precipitation ,in which , SPI was more sensitive to the change of precipitation than Z index and Pa .In the judgment of drought occurrence , Pa , SPI and Z index showed consistent results ;in the judgment of drought degree , SPI and Z index were more accurate than Pa in 1969 ,1986 ,1993 and 2000 in which moderate or heavy drought hap-pened ,while SPI conformed to reality better than Z index in 1977 and 2000 in which heavy drought happened .Through the analysis of SPI change trend in Jinghuiqu irrigation district ,it was discovered that 55 .6% of drought events occurred after 1990 and drought degree also tended to increase during the study period .In the future ,it is of great importance to take rational measures to prevent and control drought in this district .关键词
农业干旱/降水距平百分率(Pa)/标准化降水指数(SPI)/降水 Z指数/泾惠渠灌区Key words
agricultural drought/percentage of precipitation anomaly (Pa)/standard precipitation index (SPI)/Z index/Jinghuiqu irrigation district分类
农业科技引用本文复制引用
刘彦平,蔡焕杰..三种干旱指标在泾惠渠灌区的适用性分析[J].干旱地区农业研究,2014,(4):236-241,6.基金项目
国家科技支撑计划课题（2011AD2901）；国家自然科学基金项目（51179162）；高等学校学科创新引智计划项目 （）
