Responses of potential ammonia oxidation and ammonia oxidizers community to arsenic stress in seven types of soil  

作　　者：Yanan Wang Xibai Zeng Yang Zhang Nan Zhang Liyang Xu Cuixia Wu 

机构地区：[1]Chinese Academy of Agricultural Sciences,Key Laboratory of Agro-Environment,Institute of Environment and Sustainable Development in Agriculture,Ministry of Agriculture and Rural Affairs of the P.R.China,Beijing 100081,China

出　　处：《Journal of Environmental Sciences》2023年第5期15-29,共15页环境科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.41877061,41671308);Central Public-interest Scientific Institution Basal Research Fund(No.BSRF202101);the Agricultural Science and Technology Innovation Program of the Chinese Academy of Agricultural Sciences(No.CAAS-ASTIP-2016-IEDA).

摘　　要：Soil arsenic contamination is of great concern because of its toxicity to human,crops,and soil microorganisms.However,the impacts of arsenic on soil ammonia oxidizers communities remain unclear.Seven types of soil spiked with 0 or 100 mg arsenic per kg soil were incubated for 180 days and sampled at days 1,15,30,90 and 180.The changes in the community composition and abundance of ammonia oxidizing bacteria(AOB)and ammonia oxidizing archaea(AOA)were analyzed by terminal restriction fragment length polymorphism(TRFLP)analysis,clone library sequencing,and quantitative PCR(qPCR)targeting amoA gene.Results revealed considerable variations in the potential ammonia oxidation(PAO)rates in different soils,but soil PAO was not consistently significantly inhibited by arsenic,probably due to the low bioavailable arsenic contents or the existence of functional redundancy between AOB and AOA.The variations in AOB and AOA communities were closely associated with the changes in arsenic fractionations.The amoA gene abundances of AOA increased after arsenic addition,whereas AOB decreased,which corroborated the notion that AOA and AOB might occupy different niches in arsenic-contaminated soils.Phylogenetic analysis of amoA gene-encoded proteins revealed that all AOB clone sequences belonged to the genus Nitrosospira,among which those belonging to Nitrosospira cluster 3a were dominant.The main AOA sequence detected belonged to Thaumarchaeal Group 1.1b,which was considered to have a high ability to adapt to environmental changes.Our results provide new insights into the impacts of arsenic on the soil nitrogen cycling.

关 键 词：Ammonia oxidizers Arsenic Potential ammonia oxidation(PAO) rate Ecological niche Terminal restriction fragment length polymorphism(T-RFLP) analysis 

分 类 号：X53[环境科学与工程—环境工程] X172