小麦混作冠层气象因子与群体产量关系的研究

本试验采用4个不同特点的小麦品种组成单作、双作、三作和四作群体，研究了它们冠层中的气象因子和群体产量表现及气象因子与群体产量间的关系。结果表明：混作产量都高于其组份品种单作的平均产量，最高增产达15％，混作成员单作的生产力水平越高，则它们混作的群体产量越高。气象因子中光与产量的关系最为密切．群体上、中、下三个层次的光强在各处理间的差异均达极显著水平，中部光强与小区产量呈显著正相关。混作可使群体结构得到改善，例二叶和倒三叶光合效率提高，此为混作增产的重要原因之一。

Study on associations of meteorological factors in mixed farming canopy to its population yiecd in wheat

Using four different wheat varieties formed four sorts of populations, i. e. one variety population two mixed varieties population three mixes vavieties popucation and four mixed varieties population, and Studied expressions of meteorocogical factors in canopy and population yield in different populations and associations between them.The results were as follows:Every mixed farming yield was higher than average yield of its composed varieties under sole cropping, The highest rate of grouth was 15. 0%. The higher producing ability of mixed members, the higber mixed farming population yield, In meteorological factors in tensity of illumination was most closly to population yield. Upper:midelle and under canory intensities of illumination in all treatments had extrenely significant difference. positive correlation between intencity of illuminationn in middle canopy and plot yield were signicant,Mixed forming could improve population structure and photo synthetic efficiency of function leaves. This was one of the important reasons that mixed farming could increase production.