不同密度处理下玉米单株根系体积的动态变化

采用PVC管栽与大田试验相结合的方法,通过设计不同密度处理,系统研究了玉米不同层位根系体积的动态变化。结果表明:不同密度处理下,玉米单株根系体积均随着其生长发育的进程呈单峰曲线变化,峰值出现在播种后80～90 d;在播种后26 d以前其体积增加缓慢,播种26 d以后迅速增加达到最大体积后开始下降;到成熟期,3个密度处理的根系体积仍保持一定的水平。不同密度处理下,各时期的根系体积差异表现为:在播种后26 d前,3个密度处理的根系体积无明显差异,而后各生育时期均表现为低密度处理大于高密度处理,并随播种后天数的增加其体积差异逐渐增大。

The Dynamic Change of Maize Roots Bulk under Different Density Treatments

The experiment was carried out with the PVC tube plant and field plant in various density treatments to study the eharaeteristis of the change of maize roots bulk. The results were summarized as Bellow： in various density treatments root volume of the individual corn plant, showed a single peak curve along with the process of growth and development and the peak appeared in about 80 - 90 d after sowing; after sowing 26 d, its volume increased slowly and after the rapid increase in planting 26 d it began to decline after the maximum size until maturity; in three density treatments the root volume kept at certain level. Under all treatments, the differences at all stages showed： in 26 d after sowing, there was no distinguished difference between 3 treatment, after 26 d, at all growth stages root bulk in low density treatments were always bigger than those in higher density treatments and the root bulk difference increased with the time processing.