中文摘要：

利用石家庄地区主要农作物1985—2010年历年单产数据,分析讨论了该地区主要农作物单产的变化、突变和周期。结果表明：从年代际变化情况看,大部分主要农作物单产均在1990年代波动最强,在1980年代波动最弱,其中蔬菜单产波动最为剧烈,稻谷波动最弱,大部分主要农作物呈现明显增产趋势,其中蔬菜、小麦和花生单产增产趋势最为明显;从年变化情况看,蔬菜单产波动最为剧烈,棉花波动最弱,大部分主要农作物呈现明显增产趋势,其中蔬菜、小麦和花生单产增产趋势最为明显;主要农作物均呈现增产趋势,增产趋势大多出现在1980年代后期和1990年代初期,玉米、棉花和大豆气候单产出现突变现象;全区主要农作物气候单产均存在准7年的低频振荡周期,其中棉花和稻谷气候单产低频振荡周期振幅最大。

英文摘要：

Based on annual yield data per unit of staple crops in Shijiazhuang from 1985 to 2010,variation,abrupt change and period of yield per unit of staple crops were analyzed.The results showed that fluctuation of yield per unit of most staple crops was the strongest in the 1990 s and the weakest in the 1980 s with vegetable′s fluctuation being the strongest and rice′s fluctuation being the weakest,and yield per unit of most staple crops had a obvious ascending trend with yield per unit of vegetable,wheat and peanut having the most obvious ascending trend from all times′change.Fluctuation of yield per unit of vegetable was the strongest and cotton′s was the weakest,and yield per unit of most staple crops had a obvious ascending trend with yield per unit of vegetable,wheat and peanut having the most obvious ascending trend from all annual change.Yield per unit of staple crops all had a obvious ascending trend which was mainly in the late 1980 s and the early 1990 s with corn′s,soybean′s and cotton′s climatic yield per unit occurring a abrupt change respectly.Climatic yield per unit of staple crops all had a around 7 lows oscillation period with period of crop′s and rice′s climatic yield per unit being maximal.