There was a linear little decreasing trend in spring precipitation, an opposite tendency to winter precipitation, and inter-annual change was intense, and the days of precipitation was also a little decreasing.
春季降水量变化与冬季趋势相反,呈线性稍降趋势,且年际间变化激烈,降水日数趋势也稍有减少。
参考来源 - SDSM降尺度方法在哈尔滨延伸期预报中的应用·2,447,543篇论文数据，部分数据来源于NoteExpress
The winter wheat yield had no correlation with winter, spring precipitation, but had considerable correlation with winter, spring temperature.
冬小麦产量与冬季、春季降水量相关不明显，而与冬季、春季气温存在显著的正相关关系。
A kind of K drought index and its criterion are made by using spring precipitation and evaporation data of 140 stations in Northwest China from 1971-2000.
用西北地区140个气象站1971～2000年的春季降水、蒸发资料，计算了一种K干旱指数，并制定了干旱标准，分析了西北春季干旱的气候特征。
Zhou Liantong, Huang Ronghui. 2006. Characteristics of interdecadal variability of spring precipitation in North China and its possible cause [J]. Climatic Environ Res, 11 (4) : 441-450.
周连童，黄荣辉。2006。我国华北地区春季降水的年代际变化特征及其可能成因的探讨[j]。气候与环境研究，11 (4)：441 - 450。
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