| 微囊藻水华对水体中氮转化及微生物的影响 |
| 摘要点击 3494 全文点击 1728 投稿时间：2015-10-10 修订日期：2016-01-06 |
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| 中文关键词 蓝藻水华 理化因子 氨氧化菌 反硝化菌 氮转化 |
| 英文关键词 cyanobacterial blooms physical and chemical factors ammonia oxidizing bacteria denitrifying bacteria nitrogen transformation |
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| 中文摘要 |
| 氮是水生态系统初级生产力的限制性生源要素,认识水体中氮的转化特征有利于调控和削减水体中过量的氮,对维持水生态健康十分重要.氨氧化细菌、氨氧化古菌以及反硝化细菌在氮循环中发挥关键作用.通过在室内构建微宇宙模拟蓝藻水华的重复暴发,发现在蓝藻水华暴发和衰亡短期内,TN、氨氮、TOC浓度快速升高和DO急剧降低,但后期逐渐得到恢复,且水体中的TN在高浓度藻存在下迅速降低.在蓝藻水华暴发和衰亡过程中,太湖水体中氨氧化菌演化为AOB占优势,氨氧化功能活性逐渐恢复,有利于水体中氨氮的去除.蓝藻水华暴发促进太湖水体中含nirS和nirK基因反硝化菌的数量增加至起始的100倍左右,从而促进水体中总氮的去除. |
| 英文摘要 |
| 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 amoA 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 nirS/nirK was elevated by also 100 times during the bloom outbreak, which can explain the promoted denitrification in the water during cyanobacterial bloom. |
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