South China Institute of Environmental Sciences (SCIES), Ministry of Environment Protection (MEP), Guangzhou 510655, China.
State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China.
Environ Pollut. 2018 Nov;242(Pt A):426-432. doi: 10.1016/j.envpol.2018.07.020. Epub 2018 Jul 6.
Heavy metals are widely detected in natural environments, however their impacts on denitrifier community in freshwater ecosystem remain unclear. The present study investigated the changes of denitrifier communities (based on nosZ (nitrous oxide reductase) gene) in a freshwater reservoir contaminated by a severe accidental spill of heavy metals. The abundance of nosZ-denitrifiers drastically decreased, and their community richness, diversity and structure also showed considerable variations. The mainly detected denitrifying bacteria included Pseudogulbenkiania, Pseudomonas and two unknown groups. These major nosZ-denitrifier groups responded in different ways to heavy metal pollution. Metal contamination could exert a profound influence on denitrifier community in freshwater sediment. This work could provide some new insights to the impact of metal pollution on nitrogen cycling.
重金属在自然环境中广泛存在，但它们对淡水生态系统中反硝化菌群落的影响尚不清楚。本研究调查了受严重重金属意外泄漏污染的淡水水库中反硝化菌群落（基于nosZ（氧化亚氮还原酶）基因）的变化。nosZ-反硝化菌的丰度急剧下降，其群落丰富度、多样性和结构也发生了相当大的变化。主要检测到的反硝化细菌包括 Pseudogulbenkiania、Pseudomonas 和两个未知群体。这些主要的 nosZ-反硝化菌对重金属污染的反应方式不同。金属污染可能对淡水沉积物中的反硝化菌群落产生深远影响。这项工作可以为金属污染对氮循环的影响提供一些新的见解。
