【摘要】 采用相关分析、正交多项式及积分回归等方法,对陕西1971~2003年夏玉米的单产与气象因子的关系进行了分析。得出:陕西夏玉米的气象波动指数为0.1672,占夏玉米产量波动的73.1%;气象产量存在着约5年的周期性波动;6月中、下旬降水量、7月下旬气温、8月中旬降水量和9月日照时数是影响陕西夏玉米产量的关键气象因子。更多还原

【Abstract】 The statistical methods such as the relation analysis,orthogonal polynomial integral regression are used to analyze the relation between the summer maize yield and the meteorological elements during 1971～2003.The results show that the climatic motion index of the summer maize is 0.167,which has 73.1% of the summer maize yield motion.The climatic yield has about 5 years of periodic motion.The precipitation of the last twenty days in June,the temperature of the last ten days in July,the precipitation of the middle ten days in August and the sunshine in September play an important role for the summer maize yield in Shaanxi.更多还原