DOI: 10.1002/2017JG004249
Scopus记录号: 2-s2.0-85042532562
论文题名: Particulate Organic Matter Composition in Stream Runoff Following Large Storms: Role of POM Sources, Particle Size, and Event Characteristics
作者: Johnson E.R. ; Inamdar S. ; Kan J. ; Vargas R.
刊名: Journal of Geophysical Research: Biogeosciences
ISSN: 21698953
出版年: 2018
卷: 123, 期: 2 起始页码: 660
结束页码: 675
语种: 英语
英文关键词: aquatic ecosystems
; extreme climate events
; nitrogen
; organic carbon
; particulate organic matter
; storm events
英文摘要: Large storm events possess significant erosive energy capable of mobilizing large amounts of sediment and particulate organic matter (POM) into fluvial systems. This study investigated how stream POM composition varied as a function of the watershed POM source, particle size, storm event magnitude, and seasonal timing. POM composition was characterized for multiple watershed sources and for stream POM following storms in a second-order forested stream. Carbon (C) and nitrogen (N) amount, C:N ratio and isotopic content (13C and 15N) were determined for solid phase POM, whereas dissolved organic C, total N concentrations, and fluorescence characteristics were determined for solution/extracted POM. Key findings from this study were the following: (1) Composition of POM varied greatly with watershed sources with forest floor litter being C and N rich and labile, while stream banks and bed were C and N poor and recalcitrant. (2) Summer storms mobilized more carbon and nitrogen-rich labile sources, while winter events mobilized more carbon- and nitrogen-poor refractory material from near-stream sources. (3) POM composition varied by size class, with the coarse POM showing more C and N rich and labile properties, while the fine POM displayed more degraded and refractory properties. If climate variability increases the magnitude and intensity of large storm events, our observations suggest that this will not only increase the inputs of POM to aquatic systems but also result in the delivery of coarser, C and N rich, and more bioavailable POM to the stream drainage network. ©2018. 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/114507
Appears in Collections: 气候减缓与适应
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作者单位: Water Science and Policy Program, University of Delaware, Newark, DE, United States; Department of Plant and Soil Sciences, University of Delaware, Newark, DE, United States; Stroud Water Research Center, Avondale, PA, United States
Recommended Citation:
Johnson E.R.,Inamdar S.,Kan J.,et al. Particulate Organic Matter Composition in Stream Runoff Following Large Storms: Role of POM Sources, Particle Size, and Event Characteristics[J]. Journal of Geophysical Research: Biogeosciences,2018-01-01,123(2)