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[目的]研究苗期水分胁迫对水稻根系生长的影响。[方法]通过温室水培试验,采用α-萘胺法,测定水分胁迫下水稻的根系活力和吸收面积。[结果]正常水分条件下,NH4+-N使水稻根系平均直径增大,NO3--N使水稻根系总吸收面积增大,大量供应NO3--N处理的水稻根系活力最大。水分胁迫后,NO3--N营养促进根系平均直径增大,大量供应NO3--N处理的水稻根系活力最低,水稻的根系总吸收面积和活跃吸收面积均随NO3--N供应比例的增加呈上升趋势。[结论]无论是否水分胁迫,NO3--N营养均可使水稻根系总根长、根表面积、根体积增大,这为旱作水稻的水分控制、氮肥施用提供了理论依据。
[Objective] The research aimed to study the effect of seedling stage water stress on root growth of rice. [Method] The root activity and absorbed area of rice under water stress were determined by hydroponic experiment in greenhouse and α-naphthylamine method. [Result] NH4 + -N increased the average root diameter of rice, NO3 - N increased the total absorption area of rice root under normal water conditions, and the root activity of rice treated with NO3 - N was the highest. After water stress, NO3 - N nutrition promoted the increase of average diameter of root system, and the NO3 - N treated rice supply had the lowest root activity. The root total absorption area and active absorption area of rice increased with the increase of NO3 - N supply Upward trend. [Conclusion] The total root length, root surface area and root volume of rice root could be increased with or without NO3 - N nutrition, which provided the theoretical basis for the moisture control and nitrogen application of rice in dryland.