奶花芸豆群体冠层结构特征及产量性状研究

Study on canopy structure of population and yield of phaseolus vulgarisl

研究了在高产条件下,不同行距配置、密度对奶花芸豆群体冠层结构、光能分布与利用特性及产量构成的影响。结果表明在适宜的群体密度下,通过扩大行距,减小株距,有利于优化群体结构。冠层结构各指标的变化表现为:随密度增加,平均叶簇倾角变大,群体直射辐射透过系数降低,消光系数增大,株型变紧凑。但密度过大,群体直射辐射透过系数过小,冠层结构不良,造成生育后期群体叶面积较快下降。随着行距加大,叶片横向生长速度加快,叶倾角变大,群体直射辐射透过系数增加,消光系数下降。合理的密度与株行距配置可改善个体生育状况和群体通风透光条件,使产量构成因素实现最佳配置,充分利用地力和空间,从而获得最佳产量。

Effects of different spacing form,density on structure of population,light distribution and yield of phaseolus vulgaris were studied under the high yielding condition. The results indicated that there were benefits to achieve appropriate population structure and thereby the angle of inclination and extinction coefficient increased with planting density, whereas the canopy transmission coefficient for radiation penetration decreased with planting density by to enlarge space in row and reduce plant space. But canopy transmission coefficient for radiation penetration decreased with planting density. Very high planting densities negatively impacted the canopy structure, resulting in a rapid decline of leaf area index and reduce plant space. A suitable planting density can improve the yield components, enhance the sand pace and land, and give high yield.