不同水·氮条件对水稻根系生长的影响  

Effect of Different Water and Nitrogen Levels on Rice Root Growth

作　　者：沈淮东[1] 柏彦超[1] 茅正芳[2] 薛巧云[1] 陈峰[1] 汪孙军[1] 钱晓晴[1] 

机构地区：[1]扬州大学环境科学与工程学院,江苏扬州225009 [2]南京农业大学人文学院,江苏南京210095

出　　处：《安徽农业科学》2008年第8期3166-3168,共3页Journal of Anhui Agricultural Sciences

基　　金：国家自然科学基金资助项目(30370816);江苏省自然科学基金资助项目(BK2002049)

摘　　要：[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 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 NO^3- -N nutrition. Rice root total absorbing areas, active absorbing areas were increased with the increase of the proportion of NO^3- -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.

关 键 词：水稻根系 水分胁迫 氮素形态 

分 类 号：S511[农业科学—作物学]