Manganese promoted wheat straw decomposition by regulating microbial communities and enzyme activities
Manganese promoted wheat straw decomposition by regulating microbial communities and enzyme activities
复制标题
锰通过调节微生物群落和酶活性促进麦秆分解
DOI：
10.1111/jam.15266
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发表时间：
2021-08-31
影响因子：
4
通讯作者：
Gao, H.
中科院分区：
文献类型：
--
作者：
Jin, M.;Chen, X.;Gao, H.
目的研究锰（Mn）对小麦秸秆（WS）分解的剂量效应，并从土壤微生物群落和酶活性方面探讨Mn促进WS分解的可能机制。方法与结果采用180 d的培养试验，研究了不同锰浓度（0、0.25、1和2 mg g（-1））下WS的降解情况。采用对照（0 mg g（-1））和锰（0.25 mg g（-1））处理评价了微生物群落和酶活性的影响。结果表明，Mn（0.25 mg g（-1））的添加显著促进了WS的分解，并促进了碳和氮的释放。最佳Mn添加量（0.25mg·g ~（-1））也能显著提高培养期内中性木聚糖酶（NEX）、漆酶（Lac）、锰过氧化物酶（MnP）和木质素过氧化物酶（LiP）的活性。Mn（0.25 mg g（-1））的添加还富集了一些操作分类单元（OTU），这些OTU反过来具有分解作物秸秆的潜在能力，例如分泌木质纤维素分解酶。结论Mn（0.25 mg g（-1））可通过富集参与生物质分解的微生物种类，提高木质纤维素降解酶的活性，促进WS的分解。研究意义和影响本研究为锰肥促进秸秆生物降解提供了依据，为提高作物残体的利用效率提供了新的思路。
Aims This study investigated the dose-effect of manganese (Mn) addition on wheat straw (WS) decomposition, and explored the potential mechanisms of Mn involved in the acceleration of WS decomposition in regards to the soil microbial communities and enzyme activities. Methods and Results A 180-day incubation experiment was performed to examine the decomposition of WS under four Mn levels, that is, 0, 0.25, 1 and 2 mg g(-1). The effects of microbial communities and enzyme activities were evaluated using control (0 mg g(-1)) and Mn (0.25 mg g(-1)) treatments. Our results revealed that Mn (0.25 mg g(-1)) addition significantly increased WS decomposition, and enhanced the release of carbon and nitrogen. Optimal Mn addition (0.25 mg g(-1)) also caused significant increases in the activity of neutral xylanase (NEX), laccase (Lac), manganese peroxidase (MnP) and lignin peroxidase (LiP) within the incubation period. Mn (0.25 mg g(-1)) addition also enriched some operational taxonomic units (OTUs) that, in turn, had the potential ability to decompose crop straw, such as secreting lignocellulolytic enzymes. Conclusions Mn (0.25 mg g(-1)) could promote WS decomposition through enrichment of the microbial species involved in biomass decomposition, which enhanced the lignocellulose-degrading enzyme activity. Significance and Impact of the Study This study provides evidence for Mn to promote WS biodegradation after Mn application, opening new windows to improve the utilization efficiency of crop residues.