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Bull Environ Contam Toxicol. 2018 Jul;101(1):110-116. doi: 10.1007/s00128-018-2345-1. Epub 2018 May 9.

Impact of Heavy Metal Pollution on Ammonia Oxidizers in Soils in the Vicinity of a Tailings Dam, Baotou, China.

Author information

1
School of Life Sciences, Inner Mongolia University, Huhhot, 010021, China.
2
School of Life Science and Technology, Inner Mongolia University of Science and Technology, Baotou, 014010, China.
3
School of Ecology and Environment, Inner Mongolia University, Huhhot, 010021, China.
4
School of Ecology and Environment, Inner Mongolia University, Huhhot, 010021, China. ndzj@imu.edu.cn.
5
School of Life Science and Technology, Inner Mongolia University of Science and Technology, Baotou, 014010, China. siwt02@163.com.

Abstract

Soil heavy metal pollution has received increasing attention due to their toxicity to soil microorganisms. We have analyzed the effects of heavy metal pollution on ammonia-oxidizing archaea (AOA) and ammonia-oxidizing bacteria (AOB) in soils in the vicinity of a tailings dam of Baotou region, China. Results showed that AOB were dominated with Nitrosomonas-like clusters, while AOA was dominated by group1.1b (Nitrososphaera cluster). Single Cd and Cr contents, as well as compound heavy metal pollution levels, had a significant negative impact on soil potential nitrification rate and both diversities of AOA and AOB. No clear relationship was found between any single heavy metal and abundance of AOA or AOB. But compound pollution could significantly decrease AOA abundance. The results indicated that heavy metal pollution had an obviously deleterious effect on the abundance, diversity, activity and composition of ammonia oxidizers in natural soils.

KEYWORDS:

Ammonia oxidizers; AmoA gene; Heavy metal; Potential nitrification rate

PMID:
29744521
DOI:
10.1007/s00128-018-2345-1
[Indexed for MEDLINE]

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