DOI: 10.1002/2015GB005228
Scopus记录号: 2-s2.0-84962560956
论文题名: Nitrogen deposition to lakes in national parks of the western Great Lakes region: Isotopic signatures, watershed retention, and algal shifts
作者: Hobbs W ; O ; , Lafrancois B ; M ; , Stottlemyer R ; , Toczydlowski D ; , Engstrom D ; R ; , Edlund M ; B ; , Almendinger J ; E ; , Strock K ; E ; , Vandermeulen D ; , Elias J ; E ; , Saros J ; E
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2016
卷: 30, 期: 3 起始页码: 514
结束页码: 533
语种: 英语
英文关键词: diatom
; lake sediment
; National Park
; nitrogen deposition
; nitrogen stable isotopes
; western Great Lakes region
Scopus关键词: algal community
; atmospheric deposition
; biogeochemical cycle
; climate effect
; community composition
; community response
; isotopic analysis
; lacustrine deposit
; national park
; nitrogen isotope
; nutrient cycling
; watershed
; algae
; Bacillariophyta
英文摘要: Atmospheric deposition is a primary source of reactive nitrogen (Nr) to undisturbed watersheds of the Great Lakes region of the U.S., raising concerns over whether enhanced delivery over recent decades has affected lake ecosystems. The National Atmospheric Deposition Program (NADP) has been measuring Nr deposition in this region for over 35 years. Here we explore the relationships among NADP-measured Nr deposition, nitrogen stable isotopes (δ15N) in lake sediments, and the response of algal communities in 28 lakes situated in national parks of the western Great Lakes region of the U.S. We find that 36% of the lakes preserve a sediment δ15N record that is statistically correlated with some form of Nr deposition (total dissolved inorganic N, nitrate, or ammonium). Furthermore, measured long-term (since 1982) nitrogen biogeochemistry and inferred critical nitrogen loads suggest that watershed nitrogen retention and climate strongly affect whether sediment δ15N is related to Nr deposition in lake sediment records. Measurements of algal change over the last ~ 150 years suggest that Nr deposition, in-lake nutrient cycling, and watershed inputs are important factors affecting diatom community composition, in addition to direct climatic effects on lake physical limnology. The findings suggest that bulk sediment δ15N does reflect Nr deposition in some instances. In addition, this study highlights the interactive effects of Nr deposition and climate variability. ©2016. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77867
Appears in Collections: 气候变化事实与影响
There are no files associated with this item.
作者单位: St. Croix Watershed Research Station, Science Museum of Minnesota, Marine on St. Croix, MN, United States; National Park Service, Ashland, WI, United States; Department of Biological Sciences, Michigan Technological University, Houghton, MI, United States; Climate Change Institute and School of Biology and Ecology, University of Maine, Orono, ME, United States; Environmental Science Department, Dickinson College, Carlisle, PA, United States
Recommended Citation:
Hobbs W,O,, Lafrancois B,et al. Nitrogen deposition to lakes in national parks of the western Great Lakes region: Isotopic signatures, watershed retention, and algal shifts[J]. Global Biogeochemical Cycles,2016-01-01,30(3)