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《Journal of Anhui Agricultural Sciences》 2010-12
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Assessment of Climate Productivity of Natural Grassland in the Three Rivers Sources Regions in Qinghai

LI Hui-mei(Qinghai University for Nationalities,Xining,Qinghai 810007)  
According to the annual temperature and precipitation data from 7 meteorological stations in the three rivers sources regions during the period of 1971-2004,the climate conditions in the three rivers sources regions were analyzed.Using the comprehensive mathematic model,the assessment model of climatic productivity of herbage on the natural grasslands in three rivers sources regions was established.The results showed that the climatic productivity in three rivers indicated a significant decrease trend and grassland potential productivity was greater.In a small range,the climatic productivity and the altitude showed a reverse relationship.When altitude increased 100 meters,the climatic productivity will drop 1 200-1 425 kg/ha.Precipitation was also a limiting factor for the climatic productivity of natural herbage in the three rivers sources regions.
【CateGory Index】: S54;S812.1
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