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《Journal of Anhui Agricultural Sciences》 2010-03
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Long-term Annual Change Regulation and Wavelet Analysis of Reference Crop Evapotranspiration in Lhasa

YANG Yong-hong et al(Tibet Engineering and Technology Research Center of Construction and Water Conservancy,Tibet Agriculture and Animal Husbandry College,Linzhi,Tibet 860000)  
Based on daily weather data in Lhasa from 1955 to 2006,time-series data of annual value anomaly of reference crop evapotranspiration(ET0) were calculated as the basis of analysis data,and symmetric extension of the border method was used in data extension of wavelet analysis.The results showed that in Lhasa,the values of interdecadal anomaly percentage of the annual average daily ET0 in 1950s,1970s and 1980s were positive;while in 1960s,1990s and 2000s,the values were negative.The maximum value appeared in the 1950s and the minimum value appeared in the 1960s,which reflected that these two periods were abnormal;the overall trend of annual average daily ET0 showed decreasing;throughout the time region,Lhasa,annual average daily ET0 changed in the annual characteristics clearly,the strongest vibration mainly appeared in cycle of three to five years,but the decadal cycle is very weak.
【Fund】: 西藏自治区中青年自然基金项目(10-4)
【CateGory Index】: S311
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