不同水·氮条件对水稻根系生长的影响

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。

Effect of Different Water and Nitrogen Levels on Rice Root Growth

Objective] The research aimed to study the effect of water stress on rice root growth. Method] The experiment carried out in greenhouse by using α-NA method to evaluate rice root activity and absorbing areas. Result]Without PEG, NH4+-N nutrition could increase root average diameter, NO3--N nutrition could increase root total absorbing areas, and root activity reached maximum under the condition of providing a large of NO3--N nutrition. With PEG, NO3--N nutrition could increase root average diameter, and root activity reached minimum under the condition of providing a large of NO3--N nutrition. Rice root total absorbing areas, active absorbing areas were increased with the increase of the proportion of NO3--N nutrition. Conclusion] Whether PEG or not, NO3--N nutrition could augmented root total length, surface areas and volume, which could provide theoretical basis for water control on dry rice and Nitrogen use.