覆膜滴灌条件下灌水量对玉米根系分布特征的影响

Effect of Irrigation on Root Distribution Characteristics of Maize Under Film Drip Irrigation

根系生长决定了植物吸收养分和水分的能力,在作物生长中扮演了重要的角色。为了探讨水分差异对玉米根系分布规律的影响,在民勤试验站进行了不同灌水量对覆膜滴灌玉米0～100cm土层根系质量、根径及根长的影响研究,结果表明,灌水量对膜下滴灌玉米根系特征产生了重要影响：灌水量越大,其根系所占百分比和根径越大;同一生育时期,各处理不同土层根重变化较大,但其变化规律基本一致,均随着土层深度的增加,根重逐渐减小,0～40cm土层所占的重量百分比较大,同时0～40cm土层平均根径及根长也较大。试验为探索覆膜滴灌条件下玉米根系分布特征提供一定的参考,为完善覆膜滴灌灌溉制度提供一定的指导意义。

Root development play a significant role in process of crop growth and determines the ability to absorb nutrients and water of plants. In order to investigate the effect of different water treatments on maize root distribution characteristics, a field experiment is conducted to study the effect of different water volumes on root mass, root length and diameter of O~ 100 cm soil layers of film drip irrigation maize in Minqin Irrigation Experiment Station. The results show that irrigation water volumes has a major influence on maize roots characteristics under film drip irrigation： the percentage of roots and root diameter increase along with the increase of ir- rigation amount; the root mass of different water volume treatments varies on different soil layers at the same growth stages. However, the variation regulation is basically consistent. With the increase of soil layer depth, the root mass gradually reduces, while the percentage of root mass, the root diameter and the root length of 0-40 cm depth soil layers increase. The experiment results provide some reference for exploring the root distribution characteristics of maize under film drip irrigation and some guiding significance for refining the film drip irrigation system.