【摘要】 利用1951-2010年的降水和温度,通过降水温度均一化指数变化趋势、干旱站次比和连旱频次,分析了干旱的时间变化特征和空间变化特征,结合牧草产量资料,分析了干旱对牧草生产的影响。结果表明:石羊河流域整体上趋于干旱化,干旱区域有扩大趋势。近30年下游干旱化明显高于中、上游地区。石羊河流域干旱导致牧草减产,降水温度均一化指数每减少一个点,牧草产量每公顷减产149.24kg。不同月份的干旱对牧草产量的影响程度各不相同,4月份的干旱对牧草生长抑制作用最大。更多还原

【Abstract】 Based on the precipitation and air temperature data of 1951-2010,the homogenization of precipitation and temperature,the annual proportion of drought station,and continuous drought frequency were analyzed to gain insight into the temporal and spatial variation characteristics of drought in Shiyang River basin.Combined with the herbage production data,the influence of drought on herbage yield was conducted.Results showed that there was a tendency of drought in shiyang River basin,and the arid region tended to get larger.Drought trend and drought in downstream were significantly higher than that in midstream and upstream during 1981-2010.The drought reduced herbage production,the index of the homogenization of precipitation and temperature reduced a point,herbages production reduced 149.24kg / hm2.The negative effects of drought on herbages production were different in different months,the largest negative effect can be found in April.更多还原