【摘要】 在大田试验条件下于灌浆期对两种株型的高产玉米品种丰禾1(平展型)及郑单958(紧凑型)的冠层结构特征进行研究,并对灌浆期冠层结构与产量及其构成因素进行相关分析。结果表明:中密度处理下(丰禾1为5万株/hm2、郑单958为6万株/hm2),灌浆末期叶面积指数最高,衰减最慢,产量最高(丰禾1为9896kg/hm2、郑单958为10867kg/hm2);灌浆期平均叶倾角总趋势为先增大后减小;两个株型玉米品种株高、穗位高均随密度增加而增大,茎粗变化趋势相反;灌浆前期和中期叶面积指数与穗数呈显著正相关,与百粒重显著负相关;茎粗与穗粒数正相关,与百粒重呈现极显著正相关。更多还原

【Abstract】 This experiment was carried out under field conditions in Heilongjiang Province.Two different plant type corn varieties,Fenghe1(flat type) and Zhengdan 958(compact type),were chose to study the characteristics of canopy structure in grain filling stage.The correlation analysis between yield and canopy structure factors was analysized as well.The results indicated the 50000 plants/ hm2 of Fenghe 1 and 60000 plants/ hm2 of Zhengdan 958 reaching the highest yield,which was 9896 kg/hm2 and 10867 kg/hm2 respectively.As well as the leaf area index(LAI) were highest in later filling stage.The trend of the mean foliage inclination angle(MFIA) increased first and then reduced gradually during the whole grain filling stage.Accompanied with the increasing densities,the plant height and ear height were increased,and the stem diameters were decreased at the same time.The leaf area index(LAI) showed a remarkable positive correlation with the spike number per hectare in the former and the middle filling stage,while exposing a remarkable negative correlation with 100-kernel weigh.Furthermore,the experiment showed a positive correlation between the stem diameter and kernel number per spike,and a remarkable positive correlation between the stem diameter and 100-kernel weigh in grain filling stage.更多还原