昌邑近50年蒸发量的变化对盐业生产的影响

Effects of the Changes of Evaporation in Changyi in Recent 50 Years on Salt Production

采用昌邑1961～2010年气象资料，对蒸发量的年、季、月变化特征进行较全面的分析。结果表明，近50年来昌邑年际间蒸发量值的变化呈减少的趋势，下降趋势较明显；各季蒸发量均与年蒸发量的变化趋势一致，但变化幅度不同，其中春季最大，夏季最小；各季蒸发量年际、年代际振荡特征明显；其中盐业生产黄金期的蒸发量也呈现减少的趋势，进入90年代以后，下降趋势有所减缓。

Using meteorological data in Changyi during 1961 -2010, the annual, seasonal and monthly variation of evaporation were analyzed. The results showed that in recent 50 years, the interannual variation of evaporation decreases obviously. The seasonal evaporation is accordance with variation trend of annual evaporation, but the variation amplitude is various among seasons, the spring is maximum and the summer is minimum. The interannual and deeadal oscillation features are evident. The evaporation of golden period for salt production showed a decreasing trend, after entering 1990s＇ , the downward trend has slowed.