| Analysis on precipitation change characteristics of desertification in North China during recent 50 years |
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| DOI：10.7606/j.issn.1000-7601.2008.03.04 |
| Key Words: desertification in the northern China precipitation analysis by run and extremum deviation stochastic hydrological theory |
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| Abstract: |
| 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 for48years during1955～2002．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 took16．7％～33．2％ of the annual precipitation while the probability of drought was52％～61％ and the expected value of drought period is two or three years． |