Abundance and Diversity of Aerobic/Anaerobic Ammonia/Ammonium-Oxidizing Microorganisms in an Ammonium-Rich Aquitard in the Pearl River Delta of South China

2018-11-23 本站

题目：Abundance and Diversity of Aerobic/Anaerobic Ammonia/Ammonium-Oxidizing Microorganisms in an Ammonium-Rich Aquitard in the Pearl River Delta of South China

期刊：Microb Ecol

作者：KwokHo Lee1，YongFeng Wang2，Ya Wang3，JiDong Gu1，Jiu Jimmy Jiao4

单位：1.School of Biological SciencesThe University of Hong KongHong Kong SARPeople’s Republic of China；2.Guangdong Provincial Key Laboratory of Bio-control for the Forest Disease and PestGuangdong Academy of ForestryGuangzhouPeople’s Republic of China ；3.School of Earth Science and Geological EngineeringSun Yat-sen UniversityGuangzhouPeople’s Republic of China；4.Department of Earth SciencesThe University of Hong KongHong Kong SARPeople’s Republic of China

摘要：  Natural occurring groundwater with abnormally high ammonium concentrations was discovered in the aquifer-aquitard system in the Pearl River Delta, South China. The community composition and abundance of aerobic/anaerobic ammonia/ammonium-oxidizing microorganisms (AOM) in the aquitard were investigated in this study. The alpha subunit of ammonia monooxygenase gene (amoA) was used as the biomarker for the detection of aerobic ammonia-oxidizing archaea (AOA) and bacteria (AOB), and also partial 16S rRNA gene for Plantomycetes and anaerobic ammonium-oxidizing (anammox) bacteria. Phylo美高梅 analysis showed that AOA in this aquitard were affiliated with those from water columns and wastewater treatment plants; and AOB were dominated by sequences among the Nitrosomonas marina/Nitrosomonas oligotropha lineage, which were affiliated with environmental sequences from coastal eutrophic bay and subtropical estuary. The richness and diversity of both AOA and AOB communities had very little variations with the depth. Candidatus  Scalindua-related sequences dominated the anammox bacterial community. AOB amoA gene abundances were always higher than those of AOA at different depths in this aquitard. The Pearson moment correlation analysis showed that AOA amoA gene abundance positively correlated with pH and ammonium concentration, whereas AOB amoA gene abundance negatively correlated with C/N ratio. This is the first report that highlights the presence with low diversity of AOM communities in natural aquitard of rich ammonium.

关键词：Anammox，Ammonia-oxidizing archaea，Ammonia-oxidizing bacteria，Aquitard，Pearl River Delta Estuary