DOI: 10.1007/s10533-014-9999-5
Scopus记录号: 2-s2.0-84907670681
论文题名: Effects of stormwater management and stream restoration on watershed nitrogen retention
作者: Newcomer Johnson T.A. ; Kaushal S.S. ; Mayer P.M. ; Grese M.M.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 121, 期: 1 起始页码: 81
结束页码: 106
语种: 英语
英文关键词: Urban watershed continuum approach
; Denitrification
; Floodplains
; Hydrologic connectivity
; Stormwater management
; Stream restoration
Scopus关键词: denitrification
; floodplain
; groundwater-surface water interaction
; nitrogen
; restoration ecology
; source-sink dynamics
; stormwater
; streamwater
; urban area
; waste management
; water quality
; watershed
; Baltimore
; Gwynns Falls
; Maryland
; United States
英文摘要: Restoring urban infrastructure and managing the nitrogen cycle represent emerging challenges for urban water quality. We investigated whether stormwater control measures (SCMs), a form of green infrastructure, integrated into restored and degraded urban stream networks can influence watershed nitrogen loads. We hypothesized that hydrologically connected floodplains and SCMs are “hot spots” for nitrogen removal through denitrification because they have ample organic carbon, low dissolved oxygen levels, and extended hydrologic residence times. We tested this hypothesis by comparing nitrogen retention metrics in two urban stream networks (one restored and one urban degraded) that each contain SCMs, and a forested reference watershed at the Baltimore Long-Term Ecological Research site. We used an urban watershed continuum approach which included sampling over both space and time with a combination of: (1) longitudinal reach-scale mass balances of nitrogen and carbon conducted over 2 years during baseflow and storms (n = 24 sampling dates × 15 stream reaches = 360) and (2) 15N push–pull tracer experiments to measure in situ denitrification in SCMs and floodplain features (n = 72). The SCMs consisted of inline wetlands installed below a storm drain outfall at one urban site (restored Spring Branch) and a wetland/wet pond configured in an oxbow design to receive water during high flow events at another highly urbanized site (Gwynns Run). The SCMs significantly decreased total dissolved nitrogen (TDN) concentrations at both sites and significantly increased dissolved organic carbon concentrations at one site. At Spring Branch, TDN retention estimated by mass balance (g/day) was ~150 times higher within the stream network than the SCMs. There were no significant differences between mean in situ denitrification rates between SCMs and hydrologically connected floodplains. Longitudinal N budgets along the stream network showed that hydrologically connected floodplains were important sites for watershed nitrogen retention due to groundwater–surface water interactions. Overall, our results indicate that hydrologic variability can influence nitrogen source/sink dynamics along engineered stream networks. Our analysis also suggests that some major predictors for watershed N retention were: (1) streamwater and groundwater flux through stream restoration or stormwater management controls, (2) hydrologic residence times, and (3) surface area of hydrologically connected features. © 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/83610
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 Geology and Earth System Science Interdisciplinary Center, University of Maryland, 5825 University Research Ct #4048, College Park, MD, United States; National Health and Environmental Effects Research Lab, Western Ecology Division, U.S. Environmental Protection Agency, 200 SW 35th Street, Corvallis, OR, United States; National Sea Grant Office, National Oceanic and Atmospheric Administration, 1315 East-West Highway SSMC-3 #11876, Silver Spring, MD, United States; AKRF, Inc., 7250 Parkway Drive #210, Hanover, MD, United States
Recommended Citation:
Newcomer Johnson T.A.,Kaushal S.S.,Mayer P.M.,et al. Effects of stormwater management and stream restoration on watershed nitrogen retention[J]. Biogeochemistry,2014-01-01,121(1)