不同水分条件下NO_3^--N供应对水稻生长·氮吸收速率的影响  

Responses of Rice Growth and N Uptake to NO_3^--N Supply under Different Water Regimes

作　　者：薛小康[1] 胡廷旭[1] 柏彦超[1] 钱晓晴[1] 单玉华[1] 

机构地区：[1]扬州大学环境科学与工程学院,江苏省扬州农业环境安全技术服务中心,江苏扬州225009

出　　处：《安徽农业科学》2012年第9期5271-5272,5292,共3页Journal of Anhui Agricultural Sciences

基　　金：扬州大学大学生学术科技创新基金项目(2010-195)

摘　　要：[目的]研究不同水分条件下NO3--N供应对武育粳3号水稻生长及氮素吸收速率的影响。[方法]采用室内营养液培养试验,聚乙二醇(PEG6000)模拟水分胁迫处理的方法。[结果]在正常水分条件下,硝态氮供应量达60 mg/L时,水稻幼苗植株生物量最大,而NO3--N供应量对水稻幼苗的株高无显著影响,NO3--N的吸收速率均随着NO3--N供应量的增加而增加。水分胁迫条件下,水稻幼苗植株生物量随着NO3--N供应量的增加而下降,水稻幼苗株高随NO3--N供应量的增加而减少,水稻幼苗根长、平均直径、体积、表面积、根尖数均随着NO3--N供应量的增加呈下降趋势。[结论]水分胁迫影响水稻生长对NO3--N供应的响应,降低水稻对NO3--N的吸收速率。[ Objective ] The research aimed to study the effects ofNO3^--N supply on growth and N uptake of rice cultivar ＂ Wuyujing 3＂ under different water regimes. [ Method] Rice seedlings were solution-cultured and different water regimes were generated by using PEG6000. [ Resuit] Under normal water condition, the maximum biomass of rice seedlings were obtained when 60 mg/L NO3^--Nwas supplied, hut plant height of rice seedling wasn＇t affected by NO3^--N supply. However, under water stress all tested growth indexes of rice seedlings, including biomass, plant height, root length, root diameter, root volume, root surface area, and number of root tips, decreased with the increase of NO3^--Nsupply. [Conclusion] Water stress can affect the response of rice seedling growth to NO3^--Nsupply and reduce N uptake rate in rice plant.

关 键 词：水稻 水分胁迫 NO3--N 吸收速率 

分 类 号：S511[农业科学—作物学]