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首页> 外文期刊>Plant and Soil >The role of laccase in stabilization of soil organic matter by iron in various plant-dominated peatlands: degradation or sequestration?
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The role of laccase in stabilization of soil organic matter by iron in various plant-dominated peatlands: degradation or sequestration?

机译：漆酶在各种植物主导的泥炭块中铁铁稳定土壤有机物的作用：降解或封存？

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摘要

Aims The association of organic matter with iron (Fe-OM associations) is recognized as an important stabilization mechanism for soil organic matter. Our objective was to assess the factors regulating stabilization of soil organic matter by iron in various plant-dominated peatlands, and the role of laccase in the formation of Fe-OM associations. Methods We investigated Fe-bound OC content and related physicochemical and biochemical parameters in four plots with different successional vegetation, and a set of simulations was conducted to investigate the association of Fe and peat-derived dissolved organic carbon catalysed by laccase. Results Our results indicate Fe-bound OC content varies regularly with the succession gradients, and a significant positive relationship between laccase activities and Fe-bound OC content was found (R = 0.77, P < 0.05). Although laccase degradation of recalcitrant polyphenolics is related with the CO2 release from peat soils (R = 0.697; P < 0.05), the simulation results confirmed laccase can significantly promote the formation of Fe-OM association. Conclusions We propose that laccase plays a unique multifunctional role in the peatland carbon cycle. That is, while laccase degrades refractory organic matter such as lignin, it may enhance carbon sequestration by promoting the formation of Fe-OM association, which is particularly effective in acidic peat environments containing abundant iron and laccase-producing fungi.
机译：旨在将有机质与铁（Fe-Om关联）的关联被认为是土壤有机质的重要稳定机制。我们的目的是评估钢铁在各种植物主导的泥炭块中通过铁调节土壤有机物稳定的因素，以及漆酶在形成Fe-Om关联中的作用。方法在四个具有不同连续植被的四个图中研究了FE-BUNDION OC含量和相关物理化学和生化参数，并进行了一组模拟，以研究通过漆酶催化的Fe和泥炭衍生的溶解有机碳的缔合物的关联。结果我们的结果表明FE-BUNGREAD OC内容与继承梯度定期变化，发现漆酶活性和FE-BANDEC含量之间的显着阳性关系（R = 0.77，P <0.05）。尽管醋酸钙的浸润性多酚子与泥炭土壤的二氧化碳释放有关（r = 0.697; p <0.05），但仿真结果证实漆酶可以显着促进FE-OM协会的形成。结论我们提出涂抹晶座在泥炭碳循环中起着独特的多功能作用。也就是说，虽然漆晶圆使耐火材料有机质如木质素，但它可以通过促进Fe-OM关联的形成来增强碳封存，这在含有丰富的铁和生产碱性真菌的酸性泥炭环境中特别有效。

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  • 来源
    《Plant and Soil》 |2019年第2期|共16页
  • 作者

    Zhao Yunpeng; Xiang Wu; Ma Ming; Zhang Xiuzhi; Bao Zhengyu; Xie Shuyun; Yan Sen;

  • 作者单位

    China Univ Geosci Sch Earth Sci Hubei Key Lab Crit Zone Evolut Lumo Rd 388 Wuhan 430074 Hubei Peoples R China;

    China Univ Geosci Sch Earth Sci Hubei Key Lab Crit Zone Evolut Lumo Rd 388 Wuhan 430074 Hubei Peoples R China;

    China Univ Geosci Zhejiang Inst Hangzhou 311305 Zhejiang Peoples R China;

    Hebei Inst Geol Survey Shijiazhuang 050081 Hebei Peoples R China;

    China Univ Geosci Zhejiang Inst Hangzhou 311305 Zhejiang Peoples R China;

    China Univ Geosci Sch Earth Sci Hubei Key Lab Crit Zone Evolut Lumo Rd 388 Wuhan 430074 Hubei Peoples R China;

    China Univ Geosci Sch Earth Sci Hubei Key Lab Crit Zone Evolut Lumo Rd 388 Wuhan 430074 Hubei Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 土壤学;
  • 关键词

    Peatland; Carbon cycle; Soil organic matter; Fe-OM associations; Laccase; Stabilization;

    机译：泥炭地;碳循环;土壤有机物;Fe-Om关联;漆酶;稳定化;

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