气候因子对棉花产量和品级影响的灰色关联分析

GREY RELATIONAL GRADE ANALYSIS OF CLIMATIC FACTORS INFLUENCING EFFECT ON COTTON YIELD AND FIBER GRADE

采用灰色关联分析法，研究了气候因子对棉花产量和纤维品级的影响．结果表明，气候因素的变化曲线与皮棉单产和纤维品级的变化曲线相似，气候因子与皮棉产量之间的灰色关联度平均为０．６４２２，与纤维品级之间的灰色关联度为０．５５５８．对湖南棉花皮棉单产和纤维品级影响最大的气候因子是降雨日和日照时数，影响最小的是日平均温度．

The grey relational method is applied to study the effects of climatic elements on cotton yield and fiber grade , which shows that change of curves of climatic factors in 9,10 1971～1992 werer similar to that of cotton yield and fiber grade in Hunan, The mean grey re-lational grade of climatic factors and lint yield, and that of climatic factors between fiber grades are 0. 642 2 and 0. 555 8,respectively. The most important climatic factors,that effect on cotton yield and fiber grade,are rainfall and sunshine time,and the least effect mean daily temperature.