| VA菌根菌丝对土壤磷和铜的吸收及其相关性 |
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| 引用本文： | 李晓林,曹一平.VA菌根菌丝对土壤磷和铜的吸收及其相关性[J].中国农业科学,1992,25(5):65-72. |
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| 作者姓名： | 李晓林 曹一平 |
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| 作者单位： | 北京农业大学土壤与植物营养系,北京100094 |
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| 摘 要： | 利用隔网分室盆栽方法，将土壤分为根系吸收区和菌丝吸收区，以白三叶草为供试作物，定量测定了VA菌根菌丝对土壤磷和铜的吸收量及其在植物体内的分布。结果表明，菌根的侵染显著提高了植物对磷和铜的吸收。但提高的程度受菌丝生长区供磷水平的影响。施磷水平提高，菌丝吸磷量明显增加，磷在地上部和根中的分布趋势一致。铜则不同，随施磷量的增加，地上部菌丝贡献率上升，而根中贡献率下降，菌丝吸铜总量也呈下降趋势。说明，菌丝对铜的吸收和运输与磷无密切关系。然而，铜从根部向地上部的运输受植物磷营养状况影响。
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| 关 键 词： | VA菌根菌丝 白三叶草 磷 铜 |
PHOSPHORUS AND COPPER UPTAKE BY VA MYCORRHIZAL HYPHAE FROM SOIL AND THEIR RELATIONSHIP |
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| Li Xiaolin Cao Yiping.PHOSPHORUS AND COPPER UPTAKE BY VA MYCORRHIZAL HYPHAE FROM SOIL AND THEIR RELATIONSHIP[J].Scientia Agricultura Sinica,1992,25(5):65-72. |
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| Authors: | Li Xiaolin Cao Yiping |
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| Abstract: | The direct role of VA myeorrhizal hyphae in P and Cu uptake and transport were studied in the present experiment. White clover plants were grown in a calcareous soil in pots with three compartments, a central one for root growth and two outer ones for the growth of mycorrhizal hyphae. Phosphorus was applied to the soil at three levels (0, 20 and 50 mg/kg) in the outer compartments in mycorrhizal treatments. Two types of control treatments were used, one having comparable mycorrhizai infection but no access to the outer compartments, the other not being mycorrhizal but well fertilized with P. Plant dry weight was increased in mycorrhizal treatments with hyphal access to the hyphai compartments Both concentration and amount of P in roots and shoots were apparently increased as the P level in the outer compartments increased. Accordingly, the calculated delivery of P by the hyphae from the outer compartments was greatly increased.Hyphal access to the outer 'compartments also significantly increased the concentration and amount of Cu in roots and shoots, irrespective of the P levels and the amount of P taken up by the hyphae. However, the distribution of Cu between roots and shoots was largely dependent on the P levels applied to the outer compartments. |
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| Keywords: | VA mycorrhizal hyphae White clover P Cu |
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