Li Jie, Zhang Si-Fan, Xiao Lin
State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China.
Huan Jing Ke Xue. 2016 Jun 8;37(6):2164-2170. doi: 10.13227/j.hjkx.2016.06.020.
The biogeochemical cycle of nitrogen in the aquatic environment is the research hotspot in the world all the time. Nitrification and denitrification are the special processes of the microorganisms, and also the key steps in the nitrogen biogeochemical cycle possessing great significance in the freshwater ecosystem. In the processes of outbreaks of cyanobacterial blooms, total nitrogen, chlorophyll a, dissolved oxygen and pH decreased sharply, whilst dissolved organic carbon and ammonium nitrogen increased. The results of simulation of outbreaks of cyanobacterial blooms using micro-universe system in lab showed that the gene abundance was reduced in the early stage and AOA was replaced by AOB gradually. Our results also showed that the amount of denitrifiers with was elevated by also 100 times during the bloom outbreak, which can explain the promoted denitrification in the water during cyanobacterial bloom.
水生环境中氮的生物地球化学循环一直是世界范围内的研究热点。硝化作用和反硝化作用是微生物的特殊过程，也是氮生物地球化学循环中的关键步骤，在淡水生态系统中具有重要意义。在蓝藻水华暴发过程中，总氮、叶绿素a、溶解氧和pH值急剧下降，而溶解有机碳和铵态氮增加。实验室利用微宇宙系统模拟蓝藻水华暴发的结果表明，基因丰度在早期降低，氨氧化古菌逐渐被氨氧化细菌取代。我们的结果还表明，在水华暴发期间，具有[此处原文缺失具体内容]的反硝化细菌数量也增加了100倍，这可以解释蓝藻水华期间水体中反硝化作用的增强。
