岳海, 李国华, 陈丽兰, 孔广红, 梁国平. 不同供磷水平下澳洲坚果幼苗排根发生及其磷素利用[J]. 中国生态农业学报(中英文), 2010, 18(4): 753-757. DOI: 10.3724/SP.J.1011.2010.00753
引用本文: 岳海, 李国华, 陈丽兰, 孔广红, 梁国平. 不同供磷水平下澳洲坚果幼苗排根发生及其磷素利用[J]. 中国生态农业学报(中英文), 2010, 18(4): 753-757. DOI: 10.3724/SP.J.1011.2010.00753
YUE Hai, LI Guo-Hua, CHEN Li-Lan, KONG Guang-Hong, LIANG Guo-Ping. Cluster root production and P utilization of macadamia seedling under different P treatments[J]. Chinese Journal of Eco-Agriculture, 2010, 18(4): 753-757. DOI: 10.3724/SP.J.1011.2010.00753
Citation: YUE Hai, LI Guo-Hua, CHEN Li-Lan, KONG Guang-Hong, LIANG Guo-Ping. Cluster root production and P utilization of macadamia seedling under different P treatments[J]. Chinese Journal of Eco-Agriculture, 2010, 18(4): 753-757. DOI: 10.3724/SP.J.1011.2010.00753

不同供磷水平下澳洲坚果幼苗排根发生及其磷素利用

Cluster root production and P utilization of macadamia seedling under different P treatments

  • 摘要: 水培试验测试了澳洲坚果幼苗在6个供磷水平下排根的产生及对磷素利用情况, 结果表明: 随供磷量的升高(0.2~3.2 mol·L-1), 澳洲坚果幼苗排根产生量、植株干重和排根占根系干重的比例均呈下降趋势; 供磷量由0.2 mol·L-1升至1.6 mol·L-1, 非排根酸性磷酸酶活性呈升高趋势, 排根酸性磷酸酶活性变化与非排根相反, 排根酸性磷酸酶活性平均比非排根高72.86%; 全磷含量为叶片>根系>茎, 0.2 mol·L-1处理的澳洲坚果幼苗根系、茎秆和叶片全磷含量均高于其他处理; 与不施磷相比, 一定供磷量(0.2~0.4 mol·L-1)可降低非排根酸性磷酸酶活性, 提高排根产生量、植株干重、排根占根系干重的比例和排根酸性磷酸酶活性, 进而增加澳洲坚果幼苗根系、茎秆和叶片全磷含量, 最终提高植株磷含量。在0~1.6 mol·L-1供磷量下, 澳洲坚果幼苗排根产生量与植株干重、排根占根系干重的比例及茎秆、根系、植株磷含量呈显著和极显著正相关, 与排根酸性磷酸酶活性、叶片全磷含量呈90%以上正相关。

     

    Abstract: Cluster root production of macadamia seedling and its P utilization under six P treatments were evaluated in this study. For plants grown in 0.2~3.2 mol·L-1 P, the amount of cluster root, plant dry biomass and dry biomass ratio of cluster root to root system exhibit a downward trend. For the plants in 0.2~1.6 mol·L-1 P, acid phosphatase activity (APA) of non-cluster root exhibit an increasing trend ― a direct reverse of cluster root plants. Average APA of cluster root is 72.86% higher than that of non-cluster root. Also leaf P concentration is higher than roots and stems. Root, stem and leaf P concentration in 0.2 mol·L-1 P is much higher than in other treatments. Compared with treatment without P, P supply at 0.2~0.4 mol·L-1 inhibits non-cluster root APA, enhances production of cluster roots, plant dry biomass, dry biomass ratio of cluster root to root system, and cluster root APA. It also increases root, stem and leaf P concentration, subsequently improving P concentration of plants. In 0~1.6 mol·L-1 P, there are significant or very significant positive correlations between cluster root production and plant dry biomass, biomass ratio of cluster root to root system, and P concentrations of stem, root and plant. The significance of positive correlations between cluster root production and APA, and leaf P concentration exceeds 90%.

     

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