Habitat heterogeneity induces regional differences in sediment nitrogen fixation in eutrophic freshwater lake

	Habitat heterogeneity induces regional differences in sediment nitrogen fixation in eutrophic freshwater lake
	Tian, Linqi; Yan, Zaisheng; Wang, Changhui; Xu, Shengqi; Jiang, Helong
刊名	SCIENCE OF THE TOTAL ENVIRONMENT
	2021
卷号	772
英文摘要	Biological nitrogen fixation (BNF) in sediments is an important source of bioavailable nitrogen in aquatic systems. However, the effect of habitat change caused by eutrophication on nitrogen fixation within sediments is still unclear. In this study, nitrogen fixation rates and diazotroph diversities in sediments with heterogeneous ecological status in one eutrophic lake were investigated by using an isotope tracer method and sequencing of nitrogen-fixing (nif) genes. The results showed that both nitrogenase activity (NA) and nifH abundance in sediments of blooms area were higher than those in vegetation-dominated habitats. Correlation analysis showed that NA was correlated closely to nifH abundance, dissolved sulfide, and iron. The diazotrophic assemblage contained mainly Proteobacterial sequences belonging to Cluster I and III, and the variations of diazotrophic community could be explained by total nitrogen content, total phosphorus content, organic matters, sulfides, ammonium and iron content. Moreover, the co-occurrence network analysis showed the Alphaproteobacteria shaped the major interactions in diazotrophic community, and sediment properties had stronger effect on diazotrophic community in cyanobacteria-dominated habitat. This study revealed that habitat heterogeneity in eutrophic lakes shaped different succession of BNF in sediments and cyanobacterial blooms significantly improved the nitrogen-fixing activity in sediments, which broadened our understanding of nitrogen cycle and nutrient management in eutrophic freshwater lakes. (C) 2021 Elsevier B.V. All rights reserved.
内容类型	期刊论文
源URL	[http://159.226.73.51/handle/332005/20510]
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	Tian, Linqi,Yan, Zaisheng,Wang, Changhui,et al. Habitat heterogeneity induces regional differences in sediment nitrogen fixation in eutrophic freshwater lake[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2021,772.
APA	Tian, Linqi,Yan, Zaisheng,Wang, Changhui,Xu, Shengqi,&Jiang, Helong.(2021).Habitat heterogeneity induces regional differences in sediment nitrogen fixation in eutrophic freshwater lake.SCIENCE OF THE TOTAL ENVIRONMENT,772.
MLA	Tian, Linqi,et al."Habitat heterogeneity induces regional differences in sediment nitrogen fixation in eutrophic freshwater lake".SCIENCE OF THE TOTAL ENVIRONMENT 772(2021).