摘要
运用线性回归分析法、5年滑动曲线分析法和Cv值对比法对平凉气象站1952～2004年的蒸发量进行系统分析,结果表明,近50年来平凉蒸发量变化总体呈下降趋势,其平均减少速率为-19.23 mm/10a,夏季减少速率最大为-3.7 mm/10a;近50年平凉市年均蒸发量为1 425.1 mm,80年代的年均蒸发量低于平均值;月平均蒸发量最大值出现在6月,最小值出现在12月;冬、春、夏季蒸发皿蒸发量变化趋势与年变化趋势基本一致,秋季蒸发量总体变化趋势不明显;近50年平凉市的降雨量和蒸发量均在减小,但降雨量的减小速率大于蒸发量的减小速率,气候呈干燥趋势,同时,降雨量的减少在一定程度上促进了旱灾发生的频率。
By dint of linear regression analysis method,5-year running curve analysis method and Cv values comparison method,the evaporation in Pingliang City from 1952 to 2004 was studied.Results suggested that the general changes of evaporation in Pingliang in recent 50 years were decreasing.The average reduction rate was-19.23 mm/（10a）,while the maximum decreasing rate during the summer days was-3.7 mm/（10a）;the 50 years＇ average evaporation in Pingliang city was 1 425.1 mm/（10a）,whereas the 1980s＇ average evaporation was lower than the total average value;the maximum biggest evaporation occurred in June,while the minimum value occurred in December;the seasonal variation trend was consistent with the general variation trend,except for the autumn＇s evaporation change trend was not distinct;in the last 50 years,both the precipitation and the evaporation had been decreasing.However,the reception pace of precipitation was quicker than evaporation,which resulted in a drier climate.In the meantime,the reduction of precipitation promoted the occurrence of drought to certain degree.
出处
《安徽农业科学》
CAS
北大核心
2011年第27期16885-16887,16889,共4页
Journal of Anhui Agricultural Sciences
关键词
平凉
蒸发量
降雨量
气候变化
Pingliang
Evaporation
Precipitation
Climate change
作者简介
王丽军（1988-），女，甘肃天水人，硕士研究生，研究方向：环境社会学及气候变化应对。
