• 关键词：引调水河道  氮  迁移转化  微生物群落  望虞河

• 基金项目：国家自然科学基金项目（No.51809179；No.41867048）

• 姚天启
• 贵州民族大学生态环境工程学院，贵阳550025;南京水利科学研究院生态环境研究所，南京210029

• 严晗璐
• 南京水利科学研究院生态环境研究所，南京210029

• 廖雪珂
• 南京水利科学研究院生态环境研究所，南京210029;重庆交通大学河海学院，重庆400074

• 王智源
• 南京水利科学研究院生态环境研究所，南京210029

• 刘超
• 南京水利科学研究院生态环境研究所，南京210029;重庆交通大学河海学院，重庆400074

• 王志康
• 贵州民族大学生态环境工程学院，贵阳550025

• 陈求稳
• 南京水利科学研究院生态环境研究所，南京210029

• 摘要：以引江济太调水工程-望虞河为研究对象，探究引调水河道氮素的迁移转化规律及微生物群落结构特征.于2020年10月、12月以及2021年1月在望虞河沿程布设监测点位并采集水样，分析其水体理化性质、氮的形态分布及含量、微生物群落结构变化特征.结果表明：① 硝酸盐氮是望虞河沿程水体中氮素的主要存在形态，占总氮浓度的75.3%~86.5%.与其他时期相比，引水期的总氮浓度最高，并从长江到太湖方向呈先上升后下降的趋势，支流汇入可能是望虞河总氮浓度上升的主要原因.② 基于相关性分析，引调水期间Candidatus Nitrotoga、Nitrosomonas、Rhodopirellula等细菌与氮素的浓度变化密切相关，是望虞河水体中对氮素迁移转化起关键作用的属水平微生物.③ 在湖泊湖荡特有微生物Rhodopirellula等菌属的脱氮作用下，观察到相关河段总氮浓度下降，因此引调水河道中沿程的湖泊湖荡可能对引调水中总氮的去除扮演着重要角色.

• Abstract：This work selected the water division project from the Yangtze River to Taihu Lake （Wangyu River） to explore the characteristics of nitrogen transformation and the microbial community structure in the diversion river. Sampling along the Wangyu River was conducted in October， December of 2020 and January of 2021. Water samples were collected to analyze water quality， the species and content of nitrogen， and microbial community structure. The results demonstrated that： ① Nitrate nitrogen was the main form of nitrogen in the water body of Wangyu River， accounting for 75.3%~86.5% of the total nitrogen. Compared with other sampling periods， the concentration of the total nitrogen in the water diversion period was the highest， and it increased in the first half segment and then decreased in the direction of the Yangtze River to the Taihu Lake. The influx of tributaries mainly contributed to the content increase of the total nitrogen in the Wangyu River. ② Based on the correlation analysis， genus-level microorganisms of Candidatus Nitrotoga， Nitrosomonas， Rhodopirellula were closely related to the change of nitrogen concentration during the diversion period， and they play a key role in affecting the transformation of nitrogen in the Wangyu River. ③ The total nitrogen concentration in the relevant river sections decreased due to the presence of denitrifiers， e.g.， Rhodopirellula， which were unique microbes in lakes. Therefore， the lakes within the division river may play an important role in the removal of total nitrogen.

• Key words：diversion river  nitrogen  transformation  microbial community  Wangyu River

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