半干旱地区春小麦产量与自然降水关系

A Quantitative Study of Relationship Between Spring Wheat Yield and Natural Rainfall Water in Semiarid Area

运用内蒙古武川县１９６３～１９９３年降水存料和春小麦单位面积产量数据，研究了春小麦产量与自然降水的定量关系，结果表明，春小麦生产与４月降水量（Ｒ４）、６、７月降水量（Ｒ＿（６７））相关极显著，回归方程为Ｙ＿（ｗｈ）＝５．１１５０５９＋０．１２２４Ｒ＿（６７）＋０．２６７４Ｒ＿４。并对干旱年进行单独分析，得方程Ｙ＿（ｗｈ）＝１．５３０６３９－０．２９５２Ｒｙ＋０．４９８２Ｒｇ＋０．３６５９Ｒ６７－２．０８９９Ｒ４。研究认为在目前半干旱地区的生产条件下，总降水量尚未成为春小麦生产限制因子，加强投入，改善耕作技术与管理措施，改良品种是本区农业发展的潜力所在。

This paper analyses the quantitative relationship between spring wheatyield and natural rainfall based on the rainfall information and the data of spring wheatyield per unit area in the semiarid area from 1963 to 1993 in Wuchuan County of Inner Mongolia. The results show that spring wheat yield is found to be in significant correla-tioi1 with rainfall in April(R4)and that in June and July(R6.7).Its regression equationfollows Ywh=5.115059+0. 1224R67+0.2874R4.The dry year type was also analysedfrom which the eotiation is derived,i.e.Ywh=1.530639-0.2952Ry+0.4982Rg+0.3659Ra7～2.08994R.The research holds that total rainfall can not become the con-straint affecting spring wheat prodtiction in the caneof productive conditions in the semi-arid area at present.Accordingly, strenngthening inputs and improviiig cultivation tech-niqtie,management measures and spring wheat varieties hold great potentiality in devel-oping agriculture in the region.