Role of algal accumulations on the partitioning between N-2 production and dissimilatory nitrate reduction to ammonium in eutrophic lakes

	Role of algal accumulations on the partitioning between N-2 production and dissimilatory nitrate reduction to ammonium in eutrophic lakes
	Jiang, Xingyu; Gao, Guang; Zhang, Lu; Tang, Xiangming; Shao, Keqiang; Hu, Yang; Cai, Jian
刊名	WATER RESEARCH
	2020
卷号	183
英文摘要	Cyanobacterial blooms change benthic nitrogen (N) cycling in eutrophic lake ecosystems by affecting organic carbon (OC) delivery and changing in nutrients availability. Denitrification, anaerobic ammonium oxidation (anammox), and dissimilatory nitrate reduction to ammonium (DNRA) are critical dissimilatory nitrate reduction pathways that determine N removal and N recycling in aquatic environments. A mechanistic understanding of the influence of algal accumulations on partitioning among these pathways is currently lacking. In the present study, a manipulative experiment in aquarium tanks was conducted to determine the response of dissimilatory nitrate reduction pathways to changes in algal biomass, and the interactive effects of OC and nitrate. Potential dinitrogen (N-2) production and DNRA rates, and related functional gene abundances were determined during incubation of 3-4 weeks. The results indicated that high algal biomass promoted DNRA but not N-2 production. The concentrations of dissolved organic carbon were the primary factor affecting DNRA rates. Low nitrate availability limited N-2 production rates in treatments with algal pellets and without nitrate addition. Meanwhile, the AOAamoA gene abundance was significantly correlated with the nrfA and nirS gene abundances, suggesting that coupled nitrification-denitrification/DNRA was prevalent. Partitioning between N-2 production and DNRA was positively correlated with the ratios of dissolved organic carbon to nitrate. Correspondingly, in Lake Taihu during summer to fall, the relatively high organic carbon/nitrate might favorably facilitate DNRA over denitrification, subsequently sustaining cyanobacterial blooms. (C) 2020 Published by Elsevier Ltd.
内容类型	期刊论文
源URL	[http://159.226.73.51/handle/332005/20189]
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	Jiang, Xingyu,Gao, Guang,Zhang, Lu,et al. Role of algal accumulations on the partitioning between N-2 production and dissimilatory nitrate reduction to ammonium in eutrophic lakes[J]. WATER RESEARCH,2020,183.
APA	Jiang, Xingyu.,Gao, Guang.,Zhang, Lu.,Tang, Xiangming.,Shao, Keqiang.,...&Cai, Jian.(2020).Role of algal accumulations on the partitioning between N-2 production and dissimilatory nitrate reduction to ammonium in eutrophic lakes.WATER RESEARCH,183.
MLA	Jiang, Xingyu,et al."Role of algal accumulations on the partitioning between N-2 production and dissimilatory nitrate reduction to ammonium in eutrophic lakes".WATER RESEARCH 183(2020).