N2O emissions, microbial community composition and genes expressions in soil amended with vermicomposts derived from different feedstocks
文献类型： 外文期刊
作者： Zeng, Jiarui 2 ; Hu, Huixian 2 ; He, Xiaodong 2 ; Song, Wei 2 ; Wang, Fei 3 ; Zhang, Yuming 1 ; Qin, Shuping 1 ;
作者机构： 1.Chinese Acad Sci, Inst Genet & Dev Biol, Ctr Agr Resources Res, Hebei Prov Key Lab Soil Ecol,Hebei Prov Key Lab Ag, 286 Huaizhong Rd, Shijiazhuang 050021, Hebei, Peoples R China
2.Fujian Agr & Forestry Univ, Coll Resources & Environm, Fujian Prov Key Lab Soil Environm Hlth & Regulat, Fuzhou 350002, Fujian, Peoples R China
3.Fujian Acad Agr Sci, Inst Soil & Fertilizer, Fuzhou 350013, Peoples R China
关键词： Feedstocks; Vermicomposting; nirK; N2O emissions; N2O/(N2O+N-2) ratio
期刊名称：EUROPEAN JOURNAL OF SOIL BIOLOGY （ 影响因子：4.2； 五年影响因子：3.9 ）
ISSN： 1164-5563
年卷期： 2023 年 115 卷
页码：
收录情况： SCI
摘要： Vermicomposting is increasingly used to recycle organic wastes into highly-valued fertilizer. It is still unclear whether, and how, the feedstocks of vermicomposts affect soil N2O emissions. Thus, this study investigated the responses and relevant mechanisms of soil N2O emissions to the amendment of vermicomposts derived from the civil sludge and the cattle dung, using gas chromatography and microbial gene analysis. Compared to the cattle dung vermicompost, the civil sludge vermicompost increased soil N2O emission on an average of 14.5 times. This difference did not disappear when the concentrations of mineral N (NH4+ and NO3-) and metals (Zn and Fe) was adjusted to the same levels. This result indicated that the variations in mineral N and metal concentrations did not account for the difference in soil N2O emission between these two vermicomposts. The relative abundance of nirK-type denitrifying bacteria and the nirK gene expression were significantly higher in soil amended with the civil sludge vermicompost than those with the cattle dung vermicompost, suggesting that the promotion of nirK gene expression and the inhibition of N2O reduction potentially explained the higher N2O emissions under the civil sludge vermicompost amendment compared to the cattle dung vermicompost amendment. Controlling the nirK-type denitrifying bacteria and nirK gene expression at low levels and promoting N2O reduction will reduce soil N2O emission from vermicomposts.
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