Spatial and seasonal variability of nitrous oxide in a large freshwater lake in the lower reaches of the Yangtze River, China

	Spatial and seasonal variability of nitrous oxide in a large freshwater lake in the lower reaches of the Yangtze River, China
	Miao, Yuqing; Huang, Jing; Duan, Hongtao; Meng, Henan; Wang, Zuo; Qi, Tianci; Wu, Qinglong L.
刊名	SCIENCE OF THE TOTAL ENVIRONMENT
	2020
卷号	721
英文摘要	Aquatic ecosystems are recognized as a source of N2O in accordance with the flux estimations of rivers and estuaries; however, limited research has been conducted on large lakes. In this study, we report the annual N2O dynamics of a large eutrophic freshwater lake located in the subtropical zone of East China. The dissolved N2O concentrations in Lake Chaohu were observed to be between 8.5 and 92.3 nmol L-1 with emission rates between 0.3 and 53.6 mu mol m(-2) d(-1), exhibiting considerable spatiotemporal variability. The average seasonal N2O concentrations were obtained, with the highest value of 23.4 nmol L-1 found in winter and the lowest value of 12.7 nmol L-1 found in summer. In contrast to the N2O concentrations observed, the highest N2O emission rates occurred during summer, while the lowest emission rates occurred in autumn. The emissions of N2O were substantially high in the western part of the lake, which suffers from serious eutrophication. In addition, the hotspots of N2O emissions have been found around the inflowing mouth of the Nanfei River, which transports large amounts of nutrients into the lake. The results suggest that anthropogenically enhanced nutrient inputsmay have a significant role in the production and emission of N2O. However, the negative relationship between the surface water temperature and the N2O concentration suggests that, N2O fluxes might be influenced by other inconspicuous mechanisms. In the future the nitrogen dynamics of water and sediment in the lake should be collated to reveal mechanisms controlling N2O emissions. In summary, Lake Chaohu acts as a source of N2O with its most eutrophic part contributing 54.9% of the total N2O emissions of the whole lake. (C) 2020 Elsevier B.V. All rights reserved.
内容类型	期刊论文
源URL	[http://159.226.73.51/handle/332005/20274]
专题	中国科学院南京地理与湖泊研究所
推荐引用方式 GB/T 7714	Miao, Yuqing,Huang, Jing,Duan, Hongtao,et al. Spatial and seasonal variability of nitrous oxide in a large freshwater lake in the lower reaches of the Yangtze River, China[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2020,721.
APA	Miao, Yuqing.,Huang, Jing.,Duan, Hongtao.,Meng, Henan.,Wang, Zuo.,...&Wu, Qinglong L..(2020).Spatial and seasonal variability of nitrous oxide in a large freshwater lake in the lower reaches of the Yangtze River, China.SCIENCE OF THE TOTAL ENVIRONMENT,721.
MLA	Miao, Yuqing,et al."Spatial and seasonal variability of nitrous oxide in a large freshwater lake in the lower reaches of the Yangtze River, China".SCIENCE OF THE TOTAL ENVIRONMENT 721(2020).