关键词: 白掌, 白掌, 组培苗, CCFL

Abstract: The paper aims to understand change characteristics and regularity of precipitation in the yushu area in recent 55 years, the climate change characteristics of decade , annual , seasonal and monthly precipitation in Yushu Area are analyzed based on the observed data of precipitation in the city in 1961-2015 years; the periods of annual, seasonal precipitation in Yushu Area are analyzed using the wavelet transform. The results showed that the precipitation decreased with a tendency of 4.641mm per ten years, the increased rainfall was about 25.5mm The summer precipitation showed a trend of decrease, spring, autumn, winter and the precipitation increased; The decreasing tendency is the most significant in July, followed by August, The increasing tendency is the most significant in May, followed by June. The year, spring, summer and winter precipitation had a main periodicity of 26 years, autumn precipitation had a main periodicity of 12 years.