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研究不同种植密度下黑龙江省寒地春播郑单958和丰禾1的冠层结构及光辐射特征。结果表明,两个玉米品种在中密度下冠层结构及光分布均较优,产量最高。冠层内光合有效辐射、直射辐射透过系数随密度增加而减小。高密度下叶片分布的极差较大、平均叶倾角最大,其中,吐丝期郑单958叶片分布的极差及平均叶倾角分别达0.35和78.48;丰禾1分别达0.33和61.25。低密度下玉米生育后期叶面积指数最小、叶片分布的极差及光合有效辐射值最大。中密度下郑单958和丰禾1群体平均消光系数最高,吐丝期和灌浆中期分别为0.69～0.74、0.62～0.67;单株叶面积指数吐丝期至成熟期衰退最低,群体内光环境较优,利于玉米叶片的光合生产及最终产量的增加。
To study the canopy structure and light radiation characteristics of spring sowing Zhengdan 958 and Fenghe 1 in cold regions in different planting densities in Heilongjiang Province. The results showed that the canopy structure and light distribution of the two maize varieties were superior and the yield was the highest under medium density. Canopy photosynthetically active radiation, direct radiation transmission coefficient decreases with increasing density. In the high density, the distribution of leaves is very large and the average leaf inclination is the largest. Among them, the range of leaf distribution and the average leaf inclination of Zhengdan 958 during silking are 0.35 and 78.48, respectively; and Fenghe 1 are 0.33 and 61.25 respectively. Low-density maize late leaf area index minimum, leaf distribution and photosynthetic active radiation maximum value. Under medium density, the average extinction coefficient of Zhengdan958 and Fenghe1 was the highest, and the silking and filling stages were 0.69 ~ 0.74 and 0.62 ~ 0.67, respectively. The leaf area index of plantlet had the lowest decline from silking stage to mature stage, Better, conducive to photosynthetic maize leaves and increase the final yield.