Nitrogen budget at sediment-water interface altered by sediment dredging and settling particles: Benefits and drawbacks in managing eutrophication

	Nitrogen budget at sediment-water interface altered by sediment dredging and settling particles: Benefits and drawbacks in managing eutrophication
	Zhong, Jicheng; Wen, Shuailong; Zhang, Lu; Wang, Jianjun; Liu, Cheng; Yu, Juhua; Zhang, Lei; Fan, Chengxin
刊名	JOURNAL OF HAZARDOUS MATERIALS
	2021
卷号	406
英文摘要	Internal nitrogen (N) loading of lakes is commonly controlled by sediment dredging, although its comprehensive effect on internal N loading remains unclear. Herein, we examined the long-term effects of sediment dredging on internal N loading from a new perspective on the N budget at the sediment-water interface (SWI) through a simulation of field dredging performed by incubating intact sediment cores from a shallow eutrophic lake (Lake Taihu). We further evaluated the role of settling particles (SP) in the recovery of N cycle processes after dredging and its potential impact on the N budget. Our results demonstrated that dredging could help reduce organic matter and total N in sediments; improve the redox environment of the SWI; slow down N mineralization, N fixation, denitrification, and anaerobic ammonia oxidation (anammox); and alter the N budget at the SWI and the contribution of various N cycle processes. However, the input of SP enriched in fresh organic matter and N could accelerate the recovery of N cycle processes at the SWI, reducing the variation in the N budget and the contribution of each N cycle process caused by dredging. Dredging significantly reduced the N flux at the SWI, which was evident from the reduction of inorganic N release flux and N removal through denitrification and anammox. Therefore, sediment dredging has its advantages and disadvantages in managing internal N loading in lakes. To maintain a long-term control on the release of internal N through sediment dredging, measures should be taken based on the in-lake and watershed to inhibit the inflow and settlement of particulate matter.
内容类型	期刊论文
源URL	[http://159.226.73.51/handle/332005/20600]
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	Zhong, Jicheng,Wen, Shuailong,Zhang, Lu,et al. Nitrogen budget at sediment-water interface altered by sediment dredging and settling particles: Benefits and drawbacks in managing eutrophication[J]. JOURNAL OF HAZARDOUS MATERIALS,2021,406.
APA	Zhong, Jicheng.,Wen, Shuailong.,Zhang, Lu.,Wang, Jianjun.,Liu, Cheng.,...&Fan, Chengxin.(2021).Nitrogen budget at sediment-water interface altered by sediment dredging and settling particles: Benefits and drawbacks in managing eutrophication.JOURNAL OF HAZARDOUS MATERIALS,406.
MLA	Zhong, Jicheng,et al."Nitrogen budget at sediment-water interface altered by sediment dredging and settling particles: Benefits and drawbacks in managing eutrophication".JOURNAL OF HAZARDOUS MATERIALS 406(2021).