环青海湖盆地气候变化对草地生态环境的影响

通过分析近20年来环青海湖盆地的气候变化特征对环湖盆地草地生态环境的影响，发现环青海湖地区年平均温度升高、年蒸发量增大程度比较显著，而降水量增多不显著，且年际间变化较大，气温、地表蒸发等气象要素有向暖干化过渡的趋势。随气候变化，环湖盆地天然草地植被盖度，高度和产量均有不同程度下降，草地退化、沙化现象加剧。在不合理的人类经济活动和气候干旱化等因素的共同作用下，导致了环湖盆地地区水资源的减少和草地生态环境的沙漠化。

Impacts of climatic changes on grassland ecological environment of basin around Qinghai Lake

Through analysing the effects of climatic changes on grassland ecological environment of the basin around Qinghai Lake in the past 40 years,it was found that climatic changes around Qinghai Lake basin were characterized by the rising of mean annual temperature,significant increasing of mean annual evaporation and slight increasing of annual precipitation varying more greatly between years.And at the same time,some essential meteorological elements as air temperature,surface evaporation and etc are tending to transit towards warm desiccation.With the climate changes,vegetation cover,height and herbage yields of natural grassland in the basin area around Qinghai lake decresed in varying degrees.Under the joint functions of unreasonable human economic activities and climate factors,the reduction of water resources,degradation of natural grassland and desertification of the total ecological environment were speeded up.These speeded up the grassland degradation and changing to the climatic change characteristic to around Qinghai Lake basin lawn influence,discovered around Qinghai Lake area presents the yearly average temperature ascension,the tendency which the year transpiration rate increases quite is remarkable.But the precipitation increases the tendency not remarkable also the age border change quite is big,transition tendency;Do factor,so on desiccation in the and together,has caused around Qinghai Lake basin area and the lawn ecological environment desertification.