title: Inhibition effect of zinc in wastewater on the N2O emission from coastal loam soils.
abstract: The effects of zinc (Zn) on nitrous oxide (N2O) fluxes from coastal loam soil and the abundances of soil nitrifier and denitrifier were studied in a tidal microcosm receiving livestock wastewater with different Zn levels. Soil N2O emission significantly increased due to discharge of wastewater rich in ammonia (NH4+-N) while the continuous measurements of gas flux showed a durative reduction in N2O flux by high Zn input (40mgL-1) during the low tide period. Soil inorganic nitrogen concentrations increased at the end of the experiment and even more soil NH4+-N was measured in the high-Zn-level treatment, indicating an inhibition of ammonia oxidation by Zn input. Quantitative PCR of soil amoA, narG and nirK genes encoding ammonia monooxygenase, nitrate reductase and nitrite reductase, respectively, showed that the microbial abundances involved in these metabolisms were neither affected by wastewater discharge nor Zn contamination.
authors.affiliation: Marine Biology Institute, Shantou University, Shantou, Guangdong, China; Third Institute of Oceanography, State Oceanic Administration, Xiamen, Fujian, China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Huang
authors.affiliation: Third Institute of Oceanography, State Oceanic Administration, Xiamen, Fujian, China.
authors.forename: Danyun
authors.initials: D
authors.lastname: Ou
authors.affiliation: Third Institute of Oceanography, State Oceanic Administration, Xiamen, Fujian, China.
authors.forename: Shunyang
authors.initials: S
authors.lastname: Chen
authors.affiliation: Third Institute of Oceanography, State Oceanic Administration, Xiamen, Fujian, China.
authors.forename: Bin
authors.initials: B
authors.lastname: Chen
authors.affiliation: Marine Biology Institute, Shantou University, Shantou, Guangdong, China.
authors.forename: Wenhua
authors.initials: W
authors.lastname: Liu
authors.affiliation: Third Institute of Oceanography, State Oceanic Administration, Xiamen, Fujian, China.
authors.forename: Renao
authors.initials: R
authors.lastname: Bai
authors.affiliation: Third Institute of Oceanography, State Oceanic Administration, Xiamen, Fujian, China. Electronic address: gc.chen@tio.org.cn.
authors.forename: Guangcheng
authors.initials: G
authors.lastname: Chen
mesh_terms: D000818:Animals; D001105:Archaea / Q000378:metabolism; D001419:Bacteria / Q000378:metabolism; D019766:Genes, Archaeal; D005798:Genes, Bacterial; D058751:Livestock; D009609:Nitrous Oxide / Q000032:analysis*; D012987:Soil / Q000737:chemistry*; D012988:Soil Microbiology; D062065:Wastewater; D015032:Zinc / Q000032:analysis*
chemical_list: D009609:Nitrous Oxide; D012987:Soil; D062065:Wastewater; D015032:Zinc
keywords: Coastal soil; Nitrification-denitrification; Nitrogen; Nitrous oxide; Zinc