| 氮素供应形态对水稻根系形态和磷吸收的影响 |
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| 引用本文： | 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):665-668. |
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| 作者姓名： | 李宝珍 王松伟 冯慧敏 徐国华 |
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| 作者单位： | 1. 南京农业大学资源与环境科学学院,江苏南京210095;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
2. 南京农业大学资源与环境科学学院,江苏南京,210095 |
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| 基金项目： | 国家自然科学基金资助项目
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国家973计划资助项目
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| 摘 要： | 采用水培方法，研究了缺磷条件下不同形态氮（NH4+、NO3-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。
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| 关 键 词： | 铵态氮 硝态氮 磷素 根系形态 水稻 |
| 收稿时间： | 1900-01-01; |
Effects of Nitrogen Forms on Root Morphology and Phosphate Uptake in Rice |
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| Ll 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):665-668. |
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| Authors: | Ll Bao-zhen WANG Song-wei FENG Hui-min XU Guo-hua |
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| Institution: | LI Bao-zhen1,2,WANG Song-wei1,FENG Hui-min1,XU Guo-hua1, |
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| 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. |
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| Keywords: | ammonium nitrate phosphate root morphology rice |
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