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《Agricultural Research in the Arid Areas》 2008-03
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Analysis on precipitation change characteristics of desertification in North China during recent 50 years

XU Li-gang1,3,ZHOU Hong-fei2,3,TANG Ying1,3(1.Shihezi University,Shihezi,Xinjiang 832000,China;2.Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi,Xinjiang 830011,China;3.Fukang Desert Ecosystem Observation and Experiment Station,Chinese Academy of Sciences,Fukang,Xinjiang 831505,China)  
In accordance with run and extremum deviation theory and stochastic hydrological theory,analysis was made of the characteristics of precipitation variation on period and transfer regularity between ample water and low water and amount of locking water etc.,making use of the precipitation data of Qitai station,Hetian station,Jiuquan station,Etuokeqi station,Yinchuan station etc for 48 years during 1955~2002.The results showed that the period and fluctuation of precipitation kept relatively stable in Hexi area and Inner Mongolia tableland,while that in south Xinjiang presented an opposite situation.The amount of deficiency in these areas took 16.7%~33.2% of the annual precipitation,while the probability of drought was 52%~61% and the expected value of drought period is two or three years.
【Fund】: 中国科学院知识创新项目“北方沙漠化带典型生态系统植物水分关系及植被恢复”
【CateGory Index】: S161.6
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