气候变化领域集成服务门户(CCPortal): Phosphorus, nitrogen and dissolved organic carbon fluxes from sediments in freshwater rivermouths entering Green Bay (Lake Michigan; USA)

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DOI	10.1007/s10533-020-00635-0
	Phosphorus, nitrogen and dissolved organic carbon fluxes from sediments in freshwater rivermouths entering Green Bay (Lake Michigan; USA)
	Larson J.H.; James W.F.; Fitzpatrick F.A.; Frost P.C.; Evans M.A.; Reneau P.C.; Xenopoulos M.A.
发表日期	2020
ISSN	1682563
卷号	147 期号:2
英文摘要	Transitional areas between ecosystem types are often active biogeochemically due to resource limitation changes. Lotic-to-lentic transitions in freshwaters appear active biogeochemically, but few studies have directly measured nutrient processing rates to assess whether processing within the rivermouth is important for load estimates or the local communities. We measured oxic fluxes of inorganic nitrogen and phosphorus and dissolved organic carbon (DOC) from sediments in two rivermouths of Green Bay (Lake Michigan, USA). Soluble reactive phosphorus (SRP) flux was positive in most cases (overall mean 1.74 mg SRP m− 2 day− 1), as was ammonium (NH4) flux (40.6 mg NH4 m− 2 day− 1). Partial least square regression (PLSR) indicated a latent variable associated with both sediment [loosely bound phosphorus (P), iron bound P, organic content] and water column properties [temperature, DOC:dissolved inorganic nitrogen (DIN) and DOC:SRP ratios (negatively)] that was moderately associated with variation in SRP flux. PLSR analysis also indicated several sediment characteristics were moderately related to NH4 flux, especially organic content, density (negative), and porosity. Flux of nitrates/nitrites (NOX) and DOC were positively associated with the water column concentrations of NOX and DOC and qualitative estimates of the labile, non-humic types of DOC. In early summer, water column NOX and DOC concentrations were high and labile DOC may have fueled denitrification, resulting in net flux into sediments of both NOX and DOC. By late summer, water column NOX and DOC were very low and both these constituents were fluxing out of sediments into the water column. Based on our estimates for the entire period from April through September, rivermouth sediments were a net source of SRP and DIN, with a DIN:SRP ratio of ~ 44 and a NH4:NOX > 1. We estimated that the sediments in the Fox rivermouth probably contributed a small proportion of the total Fox River load during the growing season 2016 (< 5%), but at times may have contributed as much as 14% of the daily load. Despite the small size of the Fox rivermouth (< 0.5% of the watershed area), these results indicate that at times sediments can contribute substantially to the overall delivery of nitrogen and phosphorus to the nearshore zone. © 2020, This is a U.S. government work and not under copyright protection in the U.S.; foreign copyright protection may apply.
英文关键词	carbon; Great Lakes; nitrogen; phosphorus; Rivermouths; Sediment nutrient flux
学科领域	carbon flux; dissolved inorganic nitrogen; dissolved organic carbon; freshwater environment; lentic environment; lotic environment; nitrogen; phosphorus; sediment chemistry; transition zone; water column; watershed; Fox River [Wisconsin]; Great Lakes [North America]; Green Bay; Lake Michigan; United States
语种	英语
scopus关键词	carbon flux; dissolved inorganic nitrogen; dissolved organic carbon; freshwater environment; lentic environment; lotic environment; nitrogen; phosphorus; sediment chemistry; transition zone; water column; watershed; Fox River [Wisconsin]; Great Lakes [North America]; Green Bay; Lake Michigan; United States
来源期刊	Biogeochemistry
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/120391
作者单位	Upper Midwest Environmental Sciences Center, U.S. Geological Survey, 2630 Fanta Reed Road, La Crosse, WI 54603, United States; Center for Limnological Research and Rehabilitation, Department of Biology, University of Wisconsin-Stout, Menomonie, WI, United States; Upper Midwest Water Science Center, U.S. Geological Survey, Middleton, WI, United States; Department of Biology, Trent University, Peterborough, ON, Canada; Great Lakes Science Center, U.S. Geological Survey, Ann Arbor, MI, United States
推荐引用方式 GB/T 7714	Larson J.H.,James W.F.,Fitzpatrick F.A.,et al. Phosphorus, nitrogen and dissolved organic carbon fluxes from sediments in freshwater rivermouths entering Green Bay (Lake Michigan; USA)[J],2020,147(2).
APA	Larson J.H..,James W.F..,Fitzpatrick F.A..,Frost P.C..,Evans M.A..,...&Xenopoulos M.A..(2020).Phosphorus, nitrogen and dissolved organic carbon fluxes from sediments in freshwater rivermouths entering Green Bay (Lake Michigan; USA).Biogeochemistry,147(2).
MLA	Larson J.H.,et al."Phosphorus, nitrogen and dissolved organic carbon fluxes from sediments in freshwater rivermouths entering Green Bay (Lake Michigan; USA)".Biogeochemistry 147.2(2020).