不同株型高产玉米蒸腾作用的研究

在夏玉米亩产吨粮的研究中,测定了平展型玉米各单40和紧凑型玉米掖单6号大喇叭口期和吐丝期不同叶位不同密度的蒸腾速率(Tr)及其日变化.结果看出:鲁单40的Tr高于掖单6号,大喇叭口期Tr高于吐丝期.玉米前期上部展开或即将展开的叶Tr较高,后期中部和上部较高.Tr的日变化为单峰曲线,中午最高.增加种植密度使Tr减少,鲁单40玉米的Tr受密度影响较大.

Studies on Leaf Transpiration Rate of High-yield Maize (Zea mays L. ) With Different Plant-type

At twelve-leaf and silking stage stomatic transpiration rates (Tr) and their diurnal changes of the leaves of "Ludan 40",a flat-type(planophile) maize hybrid,and "Yedan 6",a compact-type(erectophile) maize hybrid,were measured in several planting densities. The results showed that the Tr of "Ludan 40" was higher than that of "Yedan 6". At twelve-leaf stage the Tr of upper spread leaves was higher than that of lower leaves. At silking stage the Trs of both upper and middle leaves were higher than that of lower leaves. The diurnal changes of the Tr in both varieties showed a single peak curve,which reached the highest at noon. The Tr was reduced when the density was in-cresed. The Tr of "Ludan 40" was deeply affected by plant density.