石灰性土壤施锰对土壤镉有效性及小麦镉吸收转运的影响
作者:
作者单位:

(1.棕榈生态城镇发展股份有限公司,河南 郑州 450000;2.河南省科学院生物研究所,河南 郑州 450000;3.河南省生态园林工程技术研究中心,河南 郑州 450000)

作者简介:

郭光光(1991-),工程师,硕士,主要从事污染土壤的绿色修复研究。E-mail:GUOGG@PALM-LA.COM。

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基金项目:

基金项目:国家自然科学基金项目(3200130512);河南省科学院基本科研业务费项目(230605041)。


Effects of manganese fertilizer on soil cadmium availability and cadmium uptake and transport by wheat in calcareous soil
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Affiliation:

(1.Palm Eco-Town Development Co. Ltd.,Zhengzhou Henan 450000;2.Institute of Biology,Henan Academy of Sciences,Zhengzhou Henan 450000;3.Henan Ecological Landscape Engineering Technology Research Center,Zhengzhou Henan 450000)

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    摘要:

    为探究锰(Mn)肥对北方石灰性镉(Cd)污染土壤中小麦生长发育及Cd吸收、转运的影响,通过盆栽培养试验,研究了Mn肥添加(100 mg/kg)对土壤Cd、Mn有效性和小麦Cd、Mn吸收转运的影响。结果表明:施用Mn降低了土壤的pH和土壤有效Cd含量,增加了土壤的有效Mn含量。与Cd处理相比,施用Mn增加了小麦秸秆、颖壳和籽粒的生物量,缓解了Cd对小麦的毒害作用。施用Mn显著降低了小麦根部、秸秆、颖壳和籽粒的Cd含量,较Cd处理相比分别降低了15.25%、10.64%、13.02%和22.60%;小麦各部位的Mn含量较Cd处理增加了15.69%~31.22%。同时,相关性分析和拟合方程结果显示,小麦根部 Mn含量与地上部Cd含量、根部向地上部Cd转运系数均呈负相关,且小麦籽粒Cd含量与根部和籽粒中的Mn、Fe、Zn含量均呈负相关关系。综合分析表明,施用Mn肥可以通过增加土壤有效Mn含量,促进小麦根部Mn吸收以及Fe、Zn元素的生物可给性,从而抑制小麦根部的Cd吸收,减少小麦根部Cd向地上部的转运。在石灰性Cd污染土壤中,需要采取更多行之有效的措施或农艺技术,进一步降低Cd在小麦籽粒中的累积。

    Abstract:

    To investigate the effects of manganese(Mn)on the growth and development of wheat and the cadmium(Cd)absorption and transport in northern calcareous Cd-contaminated soil,a pot experiment was carried out to examine the effects of Mn fertilizer addition(100 mg/kg)on Cd and Mn availability in soil and Cd and Mn uptake and translocation in wheat. The results indicated that the application of Mn resulted in a decrease in soil pH and soil available Cd,while simultaneously increasing soil available Mn. Compared with Cd,Mn application increased the biomass of wheat straw,glume,and grain,and alleviated Cd toxicity in wheat. Mn application significantly reduced Cd concentration in the wheat root,straw,glume and grain by 15.25%,10.64%,13.02% and 22.60%,respectively,when compared to Cd treatment. Compared to Cd treatment,Mn concentration in wheat tissues increased by 15.69%-31.22%. Meanwhile,the results of correlation analysis and fitting equation showed that wheat root Mn concentration was negatively correlated with shoot Cd concentration and root-to-shoot Cd transfer coefficient,and wheat grain Cd concentration was negatively correlated with Mn,Fe and Zn concentrations of root and grain. The comprehensive analysis showed that Mn fertilizer application increased available Mn content in soil,and promoted Mn absorption and the bioavailability of Fe and Zn elements in roots,thus inhibiting Cd absorption in roots and reducing the Cd transfer from roots to shoots. In calcareous Cd-contaminated soil,more effective measures or agronomic techniques are needed to further reduce wheat grain Cd accumulation.

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郭光光,武艳芳,梁欣冉,甄静,曾豪,胡传伟,徐自恒.石灰性土壤施锰对土壤镉有效性及小麦镉吸收转运的影响[J].中国土壤与肥料,2024,(10):142-150.

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  • 收稿日期:2023-12-05
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  • 录用日期:2024-02-06
  • 在线发布日期: 2024-12-26
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