不同品种青贮玉米群体光合性能指标的变化

Changes of Colony Photosynthesis Indicators of Different Silage Maize

通过对不同青贮玉米品种群体光合性能指标的研究结果表明,不同青贮玉米品种叶面积指数、光合势、群体生长率在整个生育期均呈单峰曲线变化,峰值出现在散粉至乳熟期间,因不同品种而异。净同化率则呈“马鞍”型曲线变化。多分蘖品种科试1号、植株高大品种东陵白与农大647在生育期间叶面积指数和光合势均较高,东陵白生育前、中期群体生长率显著高于其它品种,且高值持续时间较长,这是其生物产量高的生理基础。生产中,采取合理栽培措施,克服此类品种植株高大、个体繁茂、群体郁蔽导致植株病害和倒伏严重的不足,可实现青贮玉米群体生物产量的进一步提高。

The results of colony photosynthesis indicators experiment of different silage maize showed that Leaf Areas Index （LAI）, Leaf Areas Duration （LAD） and Colony growth rate of different silage maize presented single-peaked curves during growth stages, and the peak was in pollen-scattering stage and milk stage, the net assimilation rate of different silage maize presented saddle curve. Keshi No.l, which has stronger tillering ability, and Donglinghai and Nongda 647, which have higher plant height, showed higher LAI and LAD. Colony growth rate of Donglinghai was higher than other silage maize in earlier and middle growth stages, significantly, and it was the most important physiological foundation for higher biomass. The colony biomass of silage maize with higher plant height could be improved in condition of control diseases and logging through applying integrated cultivation measures.