DOI: 10.1007/s10533-014-9975-0
Scopus记录号: 2-s2.0-84900803837
论文题名: Particulate organic matter quality influences nitrate retention and denitrification in stream sediments: Evidence from a carbon burial experiment
作者: Stelzer R.S. ; Thad Scott J. ; Bartsch L.A. ; Parr T.B.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 119, 期: 2018-01-03 起始页码: 387
结束页码: 402
语种: 英语
英文关键词: Decomposition
; DOC
; Groundwater
; Linked biogeochemical cycles
; Microbes
; Nitrogen processing
Scopus关键词: biogeochemical cycle
; deciduous forest
; decomposition
; denitrification
; fluvial deposit
; groundwater flow
; mesocosm
; nitrogen
; particulate organic matter
; redox conditions
; retention
; Acer
; Acer rubrum
; Quercus rubra
英文摘要: Organic carbon supply is linked to nitrogen transformation in ecosystems. However, the role of organic carbon quality in nitrogen processing is not as well understood. We determined how the quality of particulate organic carbon (POC) influenced nitrogen transformation in stream sediments by burying identical quantities of varying quality POC (northern red oak (Quercus rubra) leaves, red maple (Acer rubrum) leaves, red maple wood) in stream mesocosms and measuring the effects on nitrogen retention and denitrification compared to a control of combusted sand. We also determined how POC quality affected the quantity and quality of dissolved organic carbon (DOC) and dissolved oxygen concentration in groundwater. Nitrate and total dissolved nitrogen (TDN) retention were assessed by comparing solute concentrations and fluxes along groundwater flow paths in the mesocosms. Denitrification was measured by in situ changes in N2 concentrations (using MIMS) and by acetylene block incubations. POC quality was measured by C:N and lignin:N ratios and DOC quality was assessed by fluorescence excitation emission matrix spectroscopy. POC quality had strong effects on nitrogen processing. Leaf treatments had much higher nitrate retention, TDN retention and denitrification rates than the wood and control treatments and red maple leaf burial resulted in higher nitrate and TDN retention rates than burial of red oak leaves. Leaf, but not wood, burial drove pore water to severe hypoxia and leaf treatments had higher DOC production and different DOC chemical composition than the wood and control treatments. We think that POC quality affected nitrogen processing in the sediments by influencing the quantity and quality of DOC and redox conditions. Our results suggest that the type of organic carbon inputs can affect the rates of nitrogen transformation in stream ecosystems. © 2014 Springer International Publishing Switzerland. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83662
Appears in Collections: 气候减缓与适应 气候变化事实与影响
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作者单位: Department of Biology and Microbiology, University of Wisconsin Oshkosh, 800 Algoma Blvd, Oshkosh, WI, 54901, United States; Department of Crop, Soil, and Environmental Sciences, University of Arkansas, 115 Plant Science Building, Fayetteville, AR, 72701, United States; Upper Midwest Environmental Sciences Center, United States Geological Survey, 2630 Fanta Reed Road, La Crosse, WI, 54603, United States; School of Biology and Ecology, University of Maine, Deering Hall, Orono, ME, 04473, United States
Recommended Citation:
Stelzer R.S.,Thad Scott J.,Bartsch L.A.,et al. Particulate organic matter quality influences nitrate retention and denitrification in stream sediments: Evidence from a carbon burial experiment[J]. Biogeochemistry,2014-01-01,119(2018-01-03)