DOI: 10.1111/ele.12689
Scopus记录号: 2-s2.0-84996523760
论文题名: Low ratios of silica to dissolved nitrogen supplied to rivers arise from agriculture not reservoirs
作者: Downing J.A. ; Cherrier C.T. ; Fulweiler R.W.
刊名: Ecology Letters
ISSN: 1461023X
EISSN: 1461-0248
出版年: 2016
卷: 19, 期: 12 起始页码: 1414
结束页码: 1418
语种: 英语
英文关键词: Coastal
; harmful algae blooms
; landscape
; marine ecology
; nitrogen
; reservoirs
; silicon
; watershed
Scopus关键词: algae
; Cyanobacteria
; nitrogen
; silicon dioxide
; agriculture
; chemistry
; ecosystem
; geographic and geological phenomena
; river
; Agriculture
; Ecosystem
; Geological Phenomena
; Nitrogen
; Rivers
; Silicon Dioxide
英文摘要: Coastal marine systems are greatly altered by toxic marine algae, eutrophication and hypoxia. These problems have been linked to decreased ratios of dissolved silica to inorganic nitrogen (Si : DIN) delivered from land. Two mechanisms for this decline under consideration are enhanced nitrogen (N) fertiliser losses from agricultural lands or Si sequestration in reservoirs. Here we examine these mechanisms via nutrient concentrations in impoundments receiving water from 130 watersheds in a landscape representative of the agriculture that often dominates coastal nutrient inputs. Decreased Si : DIN was correlated with agriculture, not impoundment. Watersheds with > 60% agricultural land yielded highest DIN, whereas Si was uncorrelated with agricultural intensity. Furthermore, eutrophic lakes were dominated by Cyanobacteria that use little Si, so reservoirs did not diminish Si : DIN. Instead, Si : DIN increased slightly as reservoir residence time increased. These data suggest that impoundments in agricultural watersheds may enhance the water quality of coastal ecosystems, whereas fertiliser losses are detrimental. © 2016 John Wiley & Sons Ltd/CNRS Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/107700
Appears in Collections: 气候减缓与适应
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作者单位: Minnesota Sea Grant College Program & Large Lakes Observatory, University of Minnesota Duluth, 31 W. College Street, Duluth, MN, United States; School of Science, Technology, Engineering & Mathematics, University of Washington, Bothell, WA, United States; Department of Earth and Environment, Boston University, 685 Commonwealth Ave, Boston, MA, United States; Department of Biology, Boston University, 5 Cummington Mall, Boston, MA, United States
Recommended Citation:
Downing J.A.,Cherrier C.T.,Fulweiler R.W.. Low ratios of silica to dissolved nitrogen supplied to rivers arise from agriculture not reservoirs[J]. Ecology Letters,2016-01-01,19(12)