DOI: 10.1002/2015GL066758
论文题名: Episodic, seasonal, and annual export of atmospheric and microbial nitrate from a temperate forest
作者: Sabo R.D. ; Nelson D.M. ; Eshleman K.N.
刊名: Geophysical Research Letters
ISSN: 0094-9460
EISSN: 1944-9191
出版年: 2016
卷: 43, 期: 2 起始页码: 683
结束页码: 691
语种: 英语
英文关键词: atmospheric N deposition
; atmospheric nitrate
; microbial nitrate
; nitrate
; stable isotopes
; temperate forest
Scopus关键词: Aerodynamics
; Forestry
; Isotopes
; Runoff
; Watersheds
; Atmospheric nitrates
; Hydrograph separation
; Hydrological condition
; N deposition
; Nitrate concentration
; Stable isotopes
; Statistical load modeling
; Temperate forests
; Nitrates
; atmospheric deposition
; atmospheric gas
; baseflow
; concentration (composition)
; hydrograph
; hydrological modeling
; nitrate
; nitrogen cycle
; runoff
; seasonal variation
; stable isotope
; temperate forest
; Appalachians
英文摘要: It remains difficult to assess the timing and amount of atmospherically deposited and microbial nitrate (NO3-NAtm and NO3-NMicro, respectively) reaching streams. To elucidate temporal variation of NO3-NAtm and NO3-NMicro, we measured nitrate concentrations, δ17O-NO3 -, and δ18O-NO3 - in a stream draining a gaged, forested watershed in the central Appalachian Mountains throughout a range of hydrological conditions during two water years. From the isotopic data we calculated Δ17O-NO3 - values, which were used to calibrate a statistical load model to estimate export of NO3-NAtm and NO3-NMicro. A hydrograph separation was used to estimate loss of NO3-NAtm and NO3-NMicro through base flow and direct runoff pathways. NO3-NAtm contributed 7-11% of the total nitrate yields and paralleled seasonal patterns of NO3-NMicro. Yields of NO3-NAtm and NO3-NMicro in streamflow during the study period were dominated (61 and 85%, respectively) by base flow transport, suggesting that base flow is a major loss pathway for both nitrate species from this watershed. © 2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84961286209&doi=10.1002%2f2015GL066758&partnerID=40&md5=4c60ad5ffc6764715216afb911c46765
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/10423
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: University of Maryland Center for Environmental Science, Appalachian Laboratory, Frostburg, MD, United States
Recommended Citation:
Sabo R.D.,Nelson D.M.,Eshleman K.N.. Episodic, seasonal, and annual export of atmospheric and microbial nitrate from a temperate forest[J]. Geophysical Research Letters,2016-01-01,43(2).