Roles of nxrA-like oxidizers and nirS-like reducers in nitrite conversion during swine manure composting

被引：31

作者：

Yin, Yanan ^{[1
,2
,3
]}

Yang, Chao ^{[1
]}

Gu, Jie ^{[2
]}

Wang, Xiaojuan ^{[2
]}

Zheng, Wei ^{[2
]}

Wang, Ru ^{[3
]}

Wang, Xiaochang ^{[1
,4
]}

Chen, Rong ^{[1
,4
]}

机构：

[1] Xian Univ Architecture & Technol, Sch Environm & Municipal Engn, Key Lab Northwest Water Resource Environm & Ecol, MOE, 13 Yanta Rd, Xian 710055, Shaanxi, Peoples R China

[2] Northwest A&F Univ, Coll Resources & Environm Sci, Yangling 712100, Shaanxi, Peoples R China

[3] Xian Univ Architecture & Technol, Shaanxi Key Lab Environm Engn, 13 Yanta Rd, Xian 710055, Shaanxi, Peoples R China

[4] Xian Univ Architecture & Technol, Int S&T Cooperat Ctr Urban Alternat Water Resourc, 13 Yanta Rd, Xian 710055, Shaanxi, Peoples R China

来源：

BIORESOURCE TECHNOLOGY | 2020年 / 297卷

关键词：

Composting; Co-occurrence pattern; nxrA; nirS; Structural equation modeling; NITROUS-OXIDE EMISSION; COMMUNITY STRUCTURE; DAIRY MANURE; AMMONIA OXIDIZERS; FUNCTIONAL GENES; CHICKEN MANURE; N2O EMISSION; BACTERIAL; NITRIFICATION; DIVERSITY;

D O I：

10.1016/j.biortech.2019.122426

中图分类号：

S2 [农业工程];

学科分类号：

0828 ;

摘要：

Nitrite has a key role in nitrogen conversion during composting. In this study, the dynamic changes in the NO2- contents, abundances of nirS and nxrA, and the bacteria that harbored these genes were determined during composting. NO2- accumulated during the initial composting stage. The nirS gene was abundant throughout composting, whereas the nxrA gene was only abundant in the late composting phases. Ralstonia sp. and Thauera sp. were the dominant denitrifiers that harbored nirS, and Nitrobacter winogradskyi Nb-255 was the dominant nitrifier that harbored nxrA. Structural equation modeling showed that NO2- was mainly reduced by nirS in the early phases, and oxidized by nxrA in the late phases, but especially in the maturity phase. Network analysis showed that the dominant bacteria harboring nirS and nxrA were hubs in the modules related to the reduction and oxidation of NO2-, and they had competitive relationships during the cooling and maturity phases.

引用

页数：8