不同密度处理对紧凑型玉米农大486叶片生长发育的影响

对不同密度对紧凑型品种农大486叶片生长发育的影响进行了研究.结果表明,随着密度的增加,单株叶面积减小,但在低密度条件下,单株最大叶面积下降的幅度较小,超过一定密度后,下降的幅度会加大.随着密度的增加,群体的最大叶面积指数增加,但增加到一定值后,其增加幅度逐渐减小.随着密度的增加,群体的叶面积指数增加,光合势增加,但净同化率却减小.密度对穗位叶叶绿素含量有较大的影响,密度增加,穗位叶叶绿素含量提前下降,使其光合能力降低,出现早衰。

Effects of Different Density Treatments on the Growth and Development of Leaves of Compact Maize Nongda 486

The effects of different density treatments on the growth a n d development of leaves of compact maize Nongda486were studied.The result sh owed that with the increasing of density,the leaf area of single plant will dec rease;but under the condition of low density,the rate of decreasing of the big gest leaf area of single plant is small,and above a certain density,the rate o f decreasing will in-crease.With the increasing of density,the biggest leaf a rea index of the group will increase,but when it reach a certain level,the rat e of increasing will decline,the leaf area index of the group and the photosynt hesis potential will increase,but the net assimilation rate(NAR)will decrease .The density can affect the content of the chlorophyll in ear leaves considerab ly.When the density increases,the contentof the chlorophyll in ear leaves will decline ahead of time,the photosynthesis ability will decline and the plant wi ll wane early.