厌氧氨氧化菌
硝酸盐
环境化学
反硝化
丰度(生态学)
总有机碳
相对物种丰度
化学
亚硝酸盐
微生物种群生物学
生态学
氮气
环境科学
细菌
生物
反硝化细菌
遗传学
有机化学
作者
Zhanbiao Yang,Lu Lu,Zhang Cheng,Junren Xian,Yuanxiang Yang,Lixia Liu,Xiaoxun Xu
出处
期刊:Water Research
[Elsevier]
日期:2022-05-01
卷期号:214: 118218-118218
被引量:11
标识
DOI:10.1016/j.watres.2022.118218
摘要
Urban lake ecosystems play important roles in nitrogen cycling, yet the occurrence, contribution and mechanism of nitrate reduction in urban closed and open lakes (UCL and UOL) remain unclear. On November - December of 2020, the potential rates of denitrification (DEN), anammox (ANA), and dissimilatory nitrate reduction to ammonium (DNRA) were quantified using slurries incubations in six urban lakes of Chengdu, China. The environmental variables, genes abundance (nirS, hzsB and nrfA), bacterial 16S rRNA gene were also measured. UOL had higher water ammonium (NH4+), nitrate (NO3-) and nitrite (NO2-), and sediment NH4+, NO3-, total organic carbon (TOC) and ferrous iron (Fe2+) content than UCL. The potential rates of DEN and anammox in UOL were 2.16- and 3.45-times more than in UCL, respectively. Conversely, the DNRA rate in UCL was 1.20-fold higher than UOL. Higher nirS and hzsB abundance were found in UOL, while higher nrfA abundance occurred in UCL. High-throughput sequencing analysis showed that the relative abundance of DEN bacteria was higher in UOL (2.59-12.30%) than in UCL (1.96-6.70%) at the genus level, while the relative abundance of DNRA bacteria was higher in UCL (2.02-4.19%) than in UOL (1.14-2.31%). The difference in the relative abundance of anammox bacteria at the genus level was not significant. Multiple linear regression showed that the physicochemical properties and nitrate reduction bacteria together control the potential nitrate reduction rates. Since a higher nitrogen retention capability appears in UCL, according to the nitrogen retention index (NRI), further management should be focused on urban closed lakes to avoid the potential for eutrophication.
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