title: Effects of bamboo charcoal on antibiotic resistance genes during chicken manure composting.
abstract: Composting is widely used for animal waste disposal, and bamboo charcoal (BC) can be used for nitrogen conservation during composting. However, the effects of BC on antibiotic resistance genes (ARGs) during chicken manure composting are still unclear. This study investigated the effects on ARGs of adding different proportions of BC (0%, 5%, 10%, and 20% w/w) to chicken manure compost. After 26 days, the relative abundances (RAs) of most ARGs (tetC, tetG, tetW, tetX, sul2, drfA1, drfA7, ermB, ermF, ermQ, and ermX) and intI1 declined by 21.6-99.5%, whereas sul1 increased by 7.5-17.7 times. The average RAs reductions with 0%, 5%, 10%, and 20% BC were 0.85, 1.05, 1.08, and 1.15 logs, respectively. The most important environmental factor for the ARG profiles was temperature according to redundancy analysis. Furthermore, BC significantly decreased the bio-Cu and bio-Zn levels, thereby reducing the co-selection pressure from heavy metals. Different proportions of BC had no significant effects on the removal of tetG, tetW, tetX, sul2, drfA1, and ermB. Supplementation with 10% BC was more effective at removing tetC and drfA7 compared with the other treatments. The results suggested that 10% BC supplementation is appropriate for reducing ARGs in chicken manure compost.
authors.affiliation: College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, People's Republic of China.
authors.forename: Haichao
authors.initials: H
authors.lastname: Li
authors.affiliation: College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, People's Republic of China.
authors.forename: Manli
authors.initials: M
authors.lastname: Duan
authors.affiliation: College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, People's Republic of China. Electronic address: gujie205@sina.com.
authors.forename: Jie
authors.initials: J
authors.lastname: Gu
authors.affiliation: College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, People's Republic of China.
authors.forename: Yajun
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, People's Republic of China.
authors.forename: Xun
authors.initials: X
authors.lastname: Qian
authors.affiliation: College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, People's Republic of China.
authors.forename: Jun
authors.initials: J
authors.lastname: Ma
authors.affiliation: College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, People's Republic of China.
authors.forename: Ranran
authors.initials: R
authors.lastname: Zhang
authors.affiliation: College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, People's Republic of China.
authors.forename: Xiaojuan
authors.initials: X
authors.lastname: Wang
mesh_terms: D000818:Animals; D000900:Anti-Bacterial Agents / Q000032:analysis*; D002606:Charcoal / Q000737:chemistry*; D002645:Chickens; D004352:Drug Resistance, Microbial / Q000235:genetics*; D005798:Genes, Bacterial; D008372:Manure / Q000032:analysis*; D019216:Metals, Heavy / Q000032:analysis; D009584:Nitrogen / Q000032:analysis; D012037:Refuse Disposal; D031787:Sasa / Q000254:growth & development; D012987:Soil / Q000737:chemistry* / Q000592:standards; D012988:Soil Microbiology; D013696:Temperature
chemical_list: D000900:Anti-Bacterial Agents; D008372:Manure; D019216:Metals, Heavy; D012987:Soil; D002606:Charcoal; D009584:Nitrogen
keywords: Antibiotic resistance gene; Bamboo charcoal; Chicken manure; Composting