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利用海北州海晏县1979-2009年地面气象观测资料和1997-2009年地上生物量资料,分析了1979年以来青藏高原的气候变化和水热条件变化,以及气温和降水量与地上生物量之间的响应关系。结果表明,1979-2009年该地区的年平均气温和降雨量均呈增加趋势,年平均气温的增加速率达0.33℃·(10a)^-1,年降雨量增幅为33.1mm·(10a)^-1;〉0℃的有效积温、生物温度和实际蒸散量均呈明显的增加趋势,而湿润度则呈明显的减少趋势。海晏县高寒草地牧草草地地上生物量呈波动增加,且与冬季降雨量呈显著的正相关,与春季降雨量相关性不显著,与夏季平均气温相关性最高。“,”The climate change present situation, climatic factors and aboveground hiomass change are calculated, and the relationship among the rainfall, air temperature and aboveground biomass was ana- lyzed, using the surface meteorological data and aboveground biomass data in Haiyan county, Haibei dis- trict of Qinghai Province from 1979 to 2009. The results show that the annual mean temperature and rain- fall present the increase trend, the increase rate of annual mean air temperature is 0.33℃ (10 a)-1 and that of annual rainfall is 33. I mm (10 a)-a. The accumulated temperature 0 ℃, biological temperature and actual evapotranspiration show the increase trend, but the moisture index appears obvious decreasing tend. The total aboveground biomass from 1997 to 2009 appears the increasing trend in Haiyan county grassland, there is highly significant positive correlation between the rainfall in winter and the total aboveground biomass and there is highly correlation between the air temperature in summer and annual aboveground biomass. The increasing trends of air temperature, rainfall and the accumulated temperature 〉0℃ are obvious. It is found that the grassland aboveground biomass in alpine, winter rainfall and sum- mer air temperature have significant correlation.