Abstract
An incubation experiment was conducted to investigate the response of ammonia-oxidizing bacteria (AOB), ammonia-oxidizing archaea (AOA), and the nitrification rate to the contamination of Cu, Zn, and Cd in two New Zealand grassland soils. The soils spiked with different concentrations of Cu (20 and 50 mg kg−1), Zn (20 and 50 mg kg−1), and Cd (2 and 10 mg kg−1) were incubated for 14 days and then treated with 500 mg kg−1 urine-N before continuing incubation for a total of 115 days. Soils were sampled at intervals throughout the incubation. The nitrification rate in soils at each sampling period was determined, and the abundance of AOB and AOA was measured by real-time quantification polymerase chain reaction (qPCR) assay of the amoA gene copy numbers. The results revealed that moderate trace metal stress did not significantly affect the abundance of AOB and AOA in the two soils, probably due to the high organic matter content of the soils which would have reduced the toxic effect of the metals. Nitrification rates were much greater and the observable nitrification period was much shorter in the dairy farm (DF) soil, in which the AOB and AOA abundances were greater than those of the mixed cropping farm (MF) soil. AOB were shown to grow under high nitrogen conditions, whereas AOA were shown to grow under low N environments, with different metal concentrations. Therefore, nitrogen status rather than metal applications was the main determining factor for AOB and AOA growth in the two soils studied.
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Acknowledgments
This study was supported by the Natural Science Foundation of China (No. 41271275) and the Introduction of International Advanced Agricultural Science and Technology Plan of Ministry of Agriculture “948 Program” (No. 2014-Z22). We would like to thank Jie Lei of Lincoln University for the technical support.
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Wang, P., Di, H.J., Cameron, K.C. et al. The response of ammonia-oxidizing microorganisms to trace metals and urine in two grassland soils in New Zealand. Environ Sci Pollut Res 24, 2476–2483 (2017). https://doi.org/10.1007/s11356-016-8030-1
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DOI: https://doi.org/10.1007/s11356-016-8030-1