High Level of Iron Inhibited Maize Straw Decomposition by Suppressing Microbial Communities and Enzyme Activities
High Level of Iron Inhibited Maize Straw Decomposition by Suppressing Microbial Communities and Enzyme Activities
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高水平的铁通过抑制微生物群落和酶活性来抑制玉米秸秆分解
DOI：
10.3390/agronomy12061286
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发表时间：
2022-05
期刊：
影响因子：
--
通讯作者：
Gao Hongjian
中科院分区：
文献类型：
--
作者：
Jin Mengcan;Guan Hao;Zhang Wenjie;Tian Da;Wei Junling;Yusef;Gao Hongjian
为了研究农作物秸秆还田后不同铁(Fe2+)含量土壤的分解速率与土壤生物性质变化之间的联系，进行了180天的培养试验，考察了玉米秸秆(MS)在0、0.3和1 mg·g−1 3个Fe2+水平下的分解情况。还检测了添加 0 和 1 mg g−1 Fe 时秸秆分解和微生物群落的酶活性。结果表明，Fe2+的添加显着抑制了MS的分解。第180天Fe2+处理中的半纤维素、纤维素和木质素含量较高证明了这一点。与第30天的对照相比，添加高铁（1 mg g−1）使漆酶（Lac）活性降低了71.82%。此外，主坐标分析（PCoA）表明高铁主要影响细菌群落。特别是，它抑制了放线菌门中微杆菌科的相对丰度，而放线菌门反过来又通过分泌木质纤维素分解酶成为农作物秸秆的潜在分解者。高浓度的 Fe2+ 通过降低细菌中放线菌门的相对丰度并抑制 Lac 活性，抑制 MS 中半纤维素、纤维素和木质素的分解。我们的研究结果为高铁含量土壤中农作物秸秆的还田提供了指导。
In order to study the linkages between the crop straw decomposition rate and the change in soil biological properties after the straw returned to the soil with different iron (Fe2+) contents, a 180-day incubation experiment was performed to examine the decomposition of maize straw (MS) under three Fe2+ levels, i.e., 0, 0.3, and 1 mg g−1. Enzyme activities regarding straw decomposition and microbial communities under 0 and 1 mg g−1 Fe addition were also detected. The results showed that Fe2+ addition significantly inhibited MS decomposition. This was evidenced by the higher contents of hemicellulose, cellulose, and lignin in Fe2+ treatments on day 180. High-Fe addition (1 mg g−1) decreased the activity of Laccase (Lac) by 71.82% compared with control on day 30. Furthermore, the principal coordinates analysis (PCoA) indicated that high-Fe mainly affected the bacterial community. In particular, it suppressed the relative abundance of Microbacteriaceae in phylum Actinomycota that, in turn, is a potential decomposer of crop straw by secreting lignocellulolytic enzymes. A high level of Fe2+ inhibited the decomposition of hemicellulose, cellulose, and lignin in MS by reducing the relative abundance of phylum Actinobacteria in bacteria and suppressing Lac activity. Our findings provide guidance for returning crop straws in soils with high-Fe content.
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DOI：
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发表时间：
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期刊：
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影响因子：
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