基于SPI指数的近50a内蒙古地区干旱特征分析  

Drought characteristics in Inne Mongolia based on the SPI index in the last 50years

作　　者：那音太[1] 

机构地区：[1]内蒙古财经大学资源与环境经济学院,呼和浩特010070

出　　处：《干旱区资源与环境》2015年第5期161-166,共6页Journal of Arid Land Resources and Environment

基　　金：内蒙古教育厅重点项目(NJ10148);内蒙古自然科学基金项目(2011MS0508);内蒙古教育厅一般项目(NJ10046)资助

摘　　要：利用近50a逐月降水资料,以标准化降水指数(SPI)作为干旱指标,详细全面地分析了内蒙古东中西部年际干旱强度、干旱覆盖范围和干旱频率特征及其演变规律。结果表明:近50a来,内蒙古东部和中部总体干旱强度增加但不显著,西部总体干旱强度减弱但不显著。从干旱覆盖范围来看,西部呈略微减少趋势,中部增加但不显著,而东部呈显著增加趋势,且中部和西部以全域性干旱为主,东部以区域性干旱为主。从干旱频率上看,东中西部空间差异性明显。东部轻旱发生频率较高的地区包括海拉尔市东北部、兴安盟、通辽市西部以及赤峰市东部,中旱在大部分地区发生的频率都较高,重旱在海拉尔市局部地区发生的频率较高;中部地区锡林郭勒盟轻旱、中旱和重旱发生的频率都较高;西部大部分地区轻旱发生的频率较高。Drought intensity,areas,frequency and evolution rules were analyzed in detail with the standardized precipitation index（ SPI） and monthly precipitation data from 46 ground stations in Inner Mongolia during recent50 a. It showed that the slight drought was mainly occurred in the east and west part of Inner Mongolia and its intensity appeared decreasing trend and moderate drought in the middle part and showed increasing trend. Drought cover area showed slightly decreasing trend in the west,insigificantly increasing trend in middle part and significantly increasing trend with 5. 67 SPI value for each ten years. In the east part,such as Hailar,Xing＇An League and the west of Tongliao the east of Chifeng,the slight drought frequency was higher,and in the most of the other regions,the moderate drought was higher. In the middle part of Inner Mongolia,such as Xilingol,the frequency of slight,moderate and heavy droughts were higher and the frequency of slight drought in the western region was also higher.

关 键 词：干旱 标准化降水指数 内蒙古 

分 类 号：P626.616[天文地球—地质矿产勘探]