辽宁省粮食单产通道模式及施肥结构变化分析

以辽宁省1949~2005年粮食单产为原始数据,引入产量通道概念分析了辽宁省粮食单产变化趋势,同时分析了1980~2005年辽宁省农用化肥施用量和施用结构的变化。结果表明,辽宁省粮食单产整体呈上升趋势,单产通道对分析单产的变化趋势辅助作用很强;农用化肥施用总量呈上升趋势,其中氮钾肥用量持续增加,磷肥用量有所下降,复肥用量呈大幅度增加;农用化肥施用一定程度上推动粮食单产的提高,但无法改变气候等外界条件引起的粮食单产的波动。

Variations Trend of Grain Yield Per Unit Area and Fertilizer Application Systems in Liaoning Province

The variation trend of grain yield per unit area was studied with Yield channel in Liaoning province from 1949 to 2005,and the chemical fertilizer application and variation of fertilizer application structure from 1980 to 2005 were also studied.The results show that the grain yield per unit area in Liaoning province had been increasing form 1949 to 2005.Yield channel can intensively help analyzing variation trend of grain yield per unit area.Chemical fertilizer application was rising,of which phosphorous fertilizer was descending only.Chemical fertilizer application can improve grain yield per unit area in the certain extent,while it can not hold back the effect of climate factors on grain yield per unit area.