地表水资源与天津粮食产量的宏观分析

分析了１９６３－１９９０年天津粮食产量与地表水资源的关系，同时计算了粮食产量随时间增长的趋势议程及扣除增长趋势的粮食相对产量序列。结果表明，由于天津地势低洼易涝，地表水资源量大于３５亿ｍ＾３的丰水年，粮食减产；而当年地表水资源量在３５亿ｍ＾３以下，前一年地表水资源量大于２０亿ｍ＾３，尤其是前一年为丰水年最有利于粮食增产。还分析了地表水资源对水稻、小麦、玉米等三种主要粮食作物的不同影响，揭示了地表水

The Analysis for Surface Water Resource and Grain Yield in Tianjin

The relation between the grain yield and surface water resource in Tianjin during 1963-1990 is analysed. Taken the influence of development of society and improvement of agrotechnique into consideration,the tendency equations of grain yield increased with times have been calculated, and the relative yields, after deducting the increase tendency, have been calculated too.The analysis shows that in the year with surface water resource more than 35×109m3,the grain yield decreases,because there is a lot of water logged lowland in Tianjin;in the year with surface water resource less than 35×109m3 and the last year surface water resource more than 20×109m3,the grain yield increases.The relations among rice,wheat,maize and surface' water resource are analysed respectively,and their close relationship are also pointed out.