氮素供应形态对水稻根系形态和磷吸收的影响

中国水稻科学

氮素供应形态对水稻根系形态和磷吸收的影响

李宝珍^1,2,王松伟¹, 冯慧敏¹,徐国华^1,*

¹南京农业大学资源与环境科学学院, 江苏南京 210095; ²中国科学院南京土壤研究所/土壤与农业可持续发展国家重点实验室，江苏南京 210008； *通讯联系人， E-mail： ghxu@njau.edu.cn

收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2008-11-10 发布日期:2008-11-10

Effects of Nitrogen Forms on Root Morphology and Phosphate Uptake in Rice

LI Baozhen ^1,2, WANG Songwei ¹, FENG Huimin ¹, XU Guohua ^1,*

¹ College of Resources and Environmental Science, Nanjing Agricultural University, Nanjing 210095, China; ² State Key Laboratory of Soil and Sustainable Agriculture/Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China； *Corresponding author, E-mail：<A href=

Received:1900-01-01 Revised:1900-01-01 Online:2008-11-10 Published:2008-11-10

摘要/Abstract

摘要： 采用水培方法，研究了缺磷条件下不同形态氮（NH₄⁺、NO^₃-和NH₄NO₃）下的水稻根系形态性状，以及它们产生的后效应对磷吸收的影响。结果表明，在氮素供应充足但磷饥饿胁迫的状况下，氮素形态对根系的影响仍然十分显著。与单一的铵营养相比，铵硝混合营养增加了根长和根系的表面积、根系的密度以及磷的总吸收量；与单一的铵或硝营养相比，铵硝混合营养可增加吸收的磷从根系向地上部的运输。因此，铵硝混合营养改善低磷胁迫下水稻对磷的吸收和转运，其部分原因与氮素形态与根系形态发生有关。

关键词: 铵态氮, 硝态氮, 磷素, 根系形态, 水稻

Abstract: A hydroponic experiment was conducted to study the effect of N forms (NH4+,NO3- and NH4NO3) on root morphology and P uptake in rice. The results indicated that the root morphology of low P starved rice was affected very significantly by N forms. In comparison with ammonium as sole N source, the ammonium nitrate nutrition increased root length, root surface area, root density, and total P uptake. In comparison to either ammonium or nitrate alone, mixture supply of the two forms of N increased transport of P from roots to the aboveground parts. It was suggested that the improved P uptake by mixture supply of both ammonium and nitrate were partially due to the stimulation of root growth.

Key words: ammonium, nitrate, phosphate, root morphology, rice

李宝珍王松伟, 冯慧敏,徐国华,. 氮素供应形态对水稻根系形态和磷吸收的影响[J]. 中国水稻科学 2008,22(6): 665-665～668 . .

LI Baozhen ,WANG Songwei ,FENG Huimin ,XU Guohua . Effects of Nitrogen Forms on Root Morphology and Phosphate Uptake in Rice [J]. Chinese Journal of Rice Science 2008,22(6): 665-665～668 ..

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