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利用1980年-2015年锡林郭勒盟3个气象站点逐月降水量资料,采用降水距平百分率,从干旱频率和干旱变化趋势率两个方面对36年间苏尼特草原年际、季节和月干旱特征进行详细分析。研究结果表明:苏尼特草原逐年降水量呈减少趋势;夏季和冬季降水量为降低趋势,春季和秋季降水量为增加趋势;年际和季节尺度轻旱和中旱频率均较高;3、4月干旱频率最高,7、8、9月无特旱。因此,降水距平百分率基本可以体现出苏尼特草原存在干旱化趋势,研究结果与实际情况基本相符,可为相关部门根据本区域干旱特征为制定相应抗旱对策提供理论依据。
Based on the monthly precipitation data of three weather stations in Xilinguole from 1980 to 2015, the percentage of precipitation anomaly was used to analyze the interannual, seasonal and monthly drought characteristics of the Sunit steppe from 36 aspects of drought frequency and drought trend rate Detailed analysis. The results showed that the annual precipitation in Sunit steppe showed a decreasing trend; the precipitation in summer and winter was decreasing trend while the precipitation in spring and autumn was increasing; the annual drought frequency and drought frequency were higher in interannual and seasonal scales; In April the highest frequency of drought, 7,8,8 no special drought. Therefore, the percentage of precipitation anomaly can basically reflect the trend of drought in the Sunit steppe, and the research results are basically consistent with the actual situation, which can provide theoretical basis for relevant departments to formulate corresponding drought-relief measures according to the characteristics of drought in this region.