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《Journal of Inner Mongolia University(Natural Science Edition)》 2011-03
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Temporal and Spatial Changes of Climate Aridity in Xilinguole Steppe Region

CHEN Jin1,2,LI Zheng-hai2,JIA Shu-hai1,BAO Ya-jing2,WANG Hai-mei3,BAO Narentuya4(1.College of Land and Environment,Shenyang Agricultural University,Shenyang 110866,China;2.College of Life Science,Dalian Nationalities University,Dalian 116600,China;3.Inner Mongolia Meteorological Observatory,Hohhot 010051,China;4.College of Ecology and Environmental Science,Inner Mongolia Agricultural University,Hohhot 010018,China)  
Drought-wet change of climate has a strong influence on the status of vegetation and environment in the steppe region.Based on the precipitation and temperature data of Xilinguole from 1981 to 2007,De Martonne Aridity index(Idm,the higher the value is,the wetter the climate is)is calculated and taken as a comprehensive index for measuring the aridity status of climate.Climate conditions of Xilinguole from 1981 to 2007 are analyzed,and temporal and spatial changes of climate aridity are studied.The results showed that:Firstly,the aridity indexes increase gradually from west to east in the geographic space of Xilinguole,and the aridity indexes of Xilinguole from 1981 to 2007 decreased with fluctuation;Secondly,average values of aridity indexes from 1981 to 2007 present a remarkable regional difference in Xilinguole,in the region west of longitude 116°E,the aridity indexes increased slowly from west to east,but in the region east of longitude 117°30′E,the aridity indexes increased rapidly from west to east;Thirdly,the aridity indexes of 80' and 90' are approximatively equal,and they have the same regulation with the aridity indexes of 27 years;Since 21century,the climate aridity of Xilinguole is promoting obviously,and the areas with the same interval of aridity indexes have moved eastward.
【Fund】: 国家自然科学基金资助项目(30970494;40765006)
【CateGory Index】: P467
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