玉米苗期根系发育对黄河泥沙充填复垦不同覆土厚度的响应

Responses of roots development under different cover thickness of filling reclaimation by Yellow river sediment at seeldling stage of maize

为探求玉米苗期根系发育对引黄河泥沙充填复垦不同覆土厚度的响应,采用聚氯乙烯（PVC）管室内模拟种植试验的方法,设置了7组不同处理,每组设定3个平行样.通过测试分析不同处理组玉米苗期根系根长、根体积、根系活力以及超氧化物歧化酶（SOD）、过氧化物酶（POD）、过氧化氢酶（CAT）活性,研究不同覆土厚度下玉米苗期根系发育状况.结果表明：随着覆土厚度的增加,根体积、根系活力显著增加,SOD、POD活性显著降低,根长和CAT活性整体上呈增加趋势,但趋势不显著.通过各项指标的显著性分析初步得出适宜玉米苗期根系生长的最优覆土厚度为60～70 cm,从而为引黄河泥沙充填复垦工程覆土厚度的优选提供了一定参考.

To explore the response of maize root growth to the yellow river sediment filling, the study used the method of indoor simulation experiment with PVC, set seven different groups with three parallel samples in each group. By testing and analyzing root length, root volume,root activity and superoxide dismutase （SOD）, peroxidase （POD）, catalase （CAT） activity of different groups, this peyzer studied the root growth of maize seeding in different soil thickness. The result showed that, with the increase of soil thickness, root volume, root activity significantly increased, SOD, POD significantly decreased, root length and CAT showed an increasing trend in overall activity, with not-significant. Through significant analysis of each indicator, the best soil thickness fit for the growth of maize root seedling is 60-70 cm, which provides reference for the optimization of soil thickness by the Yellow river sediment filling.