• ISSN 1008-505X
  • CN 11-3996/S
聂兆君, 赵鹏, 秦世玉, 王佳, 郭佳佳, 李江鹤, 刘红恩. 氮锌配施对冬小麦根土界面锌有效性及形态分级的影响[J]. 植物营养与肥料学报, 2018, 24(5): 1185-1193. DOI: 10.11674/zwyf.17477
引用本文: 聂兆君, 赵鹏, 秦世玉, 王佳, 郭佳佳, 李江鹤, 刘红恩. 氮锌配施对冬小麦根土界面锌有效性及形态分级的影响[J]. 植物营养与肥料学报, 2018, 24(5): 1185-1193. DOI: 10.11674/zwyf.17477
NIE Zhao-jun, ZHAO Peng, QIN Shi-yu, WANG Jia, GUO Jia-jia, LI Jiang-he, LIU Hong-en. Effects of combined application of nitrogen and zinc on the availability and fraction of zinc in root-soil interface of winter wheat[J]. Journal of Plant Nutrition and Fertilizers, 2018, 24(5): 1185-1193. DOI: 10.11674/zwyf.17477
Citation: NIE Zhao-jun, ZHAO Peng, QIN Shi-yu, WANG Jia, GUO Jia-jia, LI Jiang-he, LIU Hong-en. Effects of combined application of nitrogen and zinc on the availability and fraction of zinc in root-soil interface of winter wheat[J]. Journal of Plant Nutrition and Fertilizers, 2018, 24(5): 1185-1193. DOI: 10.11674/zwyf.17477

氮锌配施对冬小麦根土界面锌有效性及形态分级的影响

Effects of combined application of nitrogen and zinc on the availability and fraction of zinc in root-soil interface of winter wheat

  • 摘要:
    目的 氮能够促进冬小麦根系对锌的吸收及在籽粒中的积累。研究氮锌配施对冬小麦根土界面锌有效性及形态分级的影响,有助于探究氮锌配施促进冬小麦吸收锌的可能机制,为合理施用氮肥来提高冬小麦籽粒锌含量提供一定的理论依据。
    方法 以冬小麦为试材进行了根箱培养试验。分别设置三个氮水平 (0、0.2和0.4 g/kg) 和两个锌水平 (0和10 mg/kg),分析了冬小麦地上部锌含量、根际土和非根际土有效锌含量、pH以及六种锌形态含量。
    结果 氮锌配施 (N0.2Zn10和N0.4Zn10) 处理显著提高了冬小麦地上部干物质重和锌含量。在不施锌 (Zn0) 条件下,N0.4处理显著提高根际土壤的有效锌含量;在Zn10条件下,N0.4和N0.2处理均显著降低根际土有效锌含量,却提高了非根际土有效锌含量。无论施锌与否,N0.4和N0.2处理均显著降低根际土壤的pH,但对非根际土壤的pH影响不大。在Zn0条件下,N0.4和N0.2处理显著降低了根际土壤交换态锌、碳酸盐结合态锌及非根际土氧化物结合态锌含量,提高了非根际土交换态锌、根际与非根际土壤残渣态锌含量。在Zn10条件下,N0.4和N0.2处理显著提高了根际和非根际土交换态锌、非根际土松结有机态和紧结有机态锌及根际土残渣态锌含量,降低了根际土松结有机态、碳酸盐结合态锌及根际与非根际土壤残渣态锌含量。
    结论 氮锌配施提高冬小麦锌含量,促进冬小麦锌的吸收,可能是由于氮锌配施与冬小麦根系共同作用降低了根际土壤pH,促进土壤中锌从松结有机态和碳酸盐结合态向交换态转化,从而提高了土壤锌的有效性。

     

    Abstract:
    Objectives Nitrogen (N) is critical for zinc (Zn) absorption by roots and Zn accumulation in grains of winter wheat. This paper investigated the effect of combined application of N with Zn on the availability and chemical fractions of Zn in root-soil interface of winter wheat, which helped to investigate a possible mechanism for increase of Zn uptake by winter wheat through combined application of N with Zn, and to provide a theoretical basis for improving Zn contents in grains of winter wheat through reasonable N application.
    Methods A rhizobox experiment with three N application rates (N 0, 0.2 and 0.4 g/kg) and two Zn application rates (Zn 0 and 10 mg/kg) was conducted to analyze the Zn concentrations in aboveground parts, available Zn, pH and Zn chemical fractions in rhizosphere and non-rhizosphere soil of winter wheat.
    Results Combined application of N with Zn (N0.2Zn10 and N0.4Zn10) significantly increased the dry matter biomass and Zn concentrations in aboveground parts of winter wheat. At Zn0, N0.4 treatment significantly increased the available Zn contents in the rhizosphere soil. At Zn10, N0.4 and N0.2 treatments decreased the available Zn contents in the rhizosphere soil, while increased the available Zn concentrations in the non-rhizosphere soil. Regardless of Zn application, N0.4 and N0.2 treatments significantly decreased the rhizosphere soil pH, but did not affect the non-rhizosphere soil pH. Meanwhile, at Zn0, N0.4 and N0.2 treatments significantly decreased exchangeable Zn and carbonate bound Zn in rhizosphere soil, Fe-Mn oxides bound Zn in non-rhizosphere soil, and increased exchangeable Zn in non-rhizosphere soil, and residual Zn in rhizosphere and non-rhizosphere soil. At Zn10, N0.4 and N0.2 treatments significantly increased exchangeable Zn in rhizosphere and non-rhizosphere soil, loose and tight organic bound Zn in non-rhizosphere soil, and residual Zn in rhizosphere soil, but decreased loose organic and carbonate bound Zn in rhizosphere soil and residual Zn in rhizosphere and non-rhizosphere soil.
    Conclusions Combined application of N with Zn increased Zn concentration and enhanced the absorption of Zn by winter wheat, possible because of the combined influence of wheat root and the combination of N and Zn on the reduction of rhizosphere soil pH, promoting transformation of Zn from loose organic bound and carbonate bound fraction to exchangeable fraction to improve the bio-availability of Zn in soil.

     

/

返回文章
返回