| 不同供磷水平对纽荷尔脐橙幼树生长及叶片营养元素含量的影响 |
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| 引用本文： | 樊卫国,王立新.不同供磷水平对纽荷尔脐橙幼树生长及叶片营养元素含量的影响[J].中国农业科学,2012,45(4):714-725. |
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| 作者姓名： | 樊卫国 王立新 |
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| 作者单位： | 贵州大学喀斯特山地果树资源研究所/贵州省果树工程技术研究中心,贵阳,550025 |
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| 基金项目： | 国家科技支撑计划项目05BA901A04);贵州省科技攻关计划项目(GZ2007-3001);贵州省科技创新人才团队计划项目(2008-4007) |
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| 摘 要： | 【目的】探索不同供磷水平对纽荷尔脐橙幼树生长发育和对营养元素吸收的影响,为脐橙幼龄果园土壤磷养分诊断标准和施磷量的确定提供科学依据。【方法】以枳砧纽荷尔脐橙幼树为材料,采用土培和营养液培养的方法研究不同供磷水平对纽荷尔脐橙幼树植株总生物量、地上部及根系生物量、根冠比、根系直径、根系总长度、根系体积及表面积和叶片中矿质营养元素含量的影响。【结果】25 mg.kg-1供磷水平时纽荷尔幼树植株总生物量最大,根系发育最好,供磷水平低于25 mg.kg-1或高于45 mg.kg-1后植株总生物量和地上部及根系生物量减少。随供磷水平的提高,根系直径明显变粗;供磷水平大于85 mg.L-1后,根系总长比缺磷和5 mg.L-1供磷水平的还小;25 mg.L-1供磷水平的根系体积和总表面积最大,大于或低于25 mg.L-1的根系体积和总表面积明显减小。随供磷水平增加纽荷尔脐橙幼树叶片中磷、钙、镁、锰和铜元素含量呈正相关关系,与叶中氮、钾、铁、锌和硼元素含量呈抛物线型关系;供磷水平过低或过高会造成叶片中磷、镁、锰和铜元素的缺乏或过量累积,同时不利于氮、钾、铁、锌和硼元素的吸收。【结论】在微酸性黄壤条件下,土壤供磷水平达到25-45 mg.kg-1能够满足纽荷尔脐橙幼树良好生长和其它营养元素平衡吸收对磷的需求,供磷水平过低或过高对纽荷尔脐橙幼树的生长和营养元素吸收都有不利影响。
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| 关 键 词： | 纽荷尔脐橙 磷 营养元素 幼树 |
Effect of Different Phosphorus Levels on Growth and Leaf Element Contents of Young Newhall Navel Orange Trees |
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| FAN Wei-guo
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WANG Li-xin.Effect of Different Phosphorus Levels on Growth and Leaf Element Contents of Young Newhall Navel Orange Trees[J].Scientia Agricultura Sinica,2012,45(4):714-725. |
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| Authors: | FAN Wei-guo WANG Li-xin |
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| Institution: | (Research Institute for Fruit Resources of Karst Mountain Region,Guizhou University/ Guizhou Fruits Engineering Technology Research Centre,Guiyang 550025) |
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| Abstract: | 【Objective】The objective of this study was to explore the effect of different phosphorus levels on the growth and element absorption of young Newhall navel orange trees,and provide a scientific foundation for the determination of soil phosphorus diagnostic criteria and phosphorus application for the young trees.【Method】Using young Newhall navel orange trees grafted on Poncirus trifoliata(L.) Raf.as materials,the soil culture and nutrient solution experiments were employed to study the effect of different phosphorus levels on the growth and leaf element contents,including plant total biomass,root and shoot biomass,root-shoot ratio,average diameter of root,total length of root,root volume,surface area of root and element contents in leaves.【Result】Under the condition of 25 mg·L-1 phosphorus nutrition level,the development of Newhall navel orange root was the best and the plant total biomass was the largest.The plant total biomass,root and shoot biomass decreased when the phosphorus nutrition level was lower than 25 mg·L-1 or higher than 45 mg·L-1.With the phosphorus nutrition levels increasing,the average root diameter increased until the phosphorus level beyond 85mg·kg-1.Supplied with 25 mg·L-1 phosphorus,root volume or surface area was larger than that of lower than 25 mg·L-1 or higher than 45 mg·L-1 of phosphorus levels.With the phosphorus nutrition level increasing,the elements contents of P,Ca,Mg,Mn and Cu increased,but when the phosphorus nutrition level was extremely low or high,the contents of P,Mg,Mn and Cu would be deficient or excessively accumulative.In addition,there was a parabola relationship between the contents of N,K,Fe,Zn,and B elements and the phosphorus nutrition level.And elements absorption of N,K,Fe,Zn,and B was inhibited when the phosphorus nutrition level was extremely low or high.【Conclusion】 In the subacid yellow soil,phosphorus level of 25 mg·kg-1 to 45 mg·kg-1 could meet the demand for plant growth and balance the other elements absorption of the Newhall navel orange young tree,and beyond that,some adverse effects will occur. |
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| Keywords: | Newhall navel orange phosphorus element young tree |
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