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DOI | 10.1088/1748-9326/ab751b |
Low threshold for nitrogen concentration saturation in headwaters increases regional and coastal delivery | |
Schmadel, Noah M.1; Harvey, Judson W.1; Alexander, Richard B.2; Boyer, Elizabeth W.3; Schwarz, Gregory E.2; Gomez-Velez, Jesus D.4; Scott, Durelle5; Konrad, Christopher P.6 | |
2020-04-01 | |
发表期刊 | ENVIRONMENTAL RESEARCH LETTERS |
ISSN | 1748-9326 |
出版年 | 2020 |
卷号 | 15期号:4 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | River corridors store, convey, and process nutrients from terrestrial and upstream sources, regulating delivery from headwaters to estuaries. A consequence of chronic excess nitrogen loading, as supported by theory and field studies in specific watersheds, is saturation of the biogeochemically-mediated nitrogen removal processes that weakens the capacity of the river corridor to remove nitrogen. Regional nitrogen models typically assume that removal capacity exhibits first-order behavior, scaling positively and linearly with increasing concentration, which may bias the estimation of where and at what rate nitrogen is removed by river corridors. Here we estimate the nitrogen concentration saturation threshold and its effects on annual nitrogen export from the Northeastern United States, revealing an average 42% concentration-induced reduction in headwater removal capacity. The weakened capacity caused an average 10% increase in the predicted delivery of riverine nitrogen from urban and agricultural watersheds compared to estimates using first-order process assumptions. Our results suggest that nitrogen removal may fall below a first-order rate process as riverine concentration increases above a threshold of 0.5 mg N l(-1). Threshold behavior indicates that even modest mitigation of nitrogen concentration in river corridors above the threshold can cause a self-reinforcing boost to nitrogen removal. |
英文关键词 | regional nitrogen budget nitrogen concentration saturation headwaters river corridor |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000523507900001 |
WOS关键词 | MODELING DENITRIFICATION ; WATER ; NUTRIENT ; CONSEQUENCES ; NORTHEASTERN ; TERRESTRIAL ; RETENTION ; EXCHANGE ; REMOVAL ; MARINE |
WOS类目 | Environmental Sciences ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/279301 |
专题 | 气候变化 |
作者单位 | 1.US Geol Survey, Earth Syst Proc Div, 959 Natl Ctr, Reston, VA 22092 USA; 2.US Geol Survey, Integrated Modeling & Predict Div, 959 Natl Ctr, Reston, VA 22092 USA; 3.Penn State, Dept Ecosyst Sci & Management, State Coll, PA USA; 4.Vanderbilt Univ, Dept Civil & Environm Engn, Nashville, TN 37235 USA; 5.Virginia Tech, Dept Biol Syst Engn, Blacksburg, VA USA; 6.US Geol Survey, Washington Water Sci Ctr, Tacoma, WA USA |
推荐引用方式 GB/T 7714 | Schmadel, Noah M.,Harvey, Judson W.,Alexander, Richard B.,et al. Low threshold for nitrogen concentration saturation in headwaters increases regional and coastal delivery[J]. ENVIRONMENTAL RESEARCH LETTERS,2020,15(4). |
APA | Schmadel, Noah M..,Harvey, Judson W..,Alexander, Richard B..,Boyer, Elizabeth W..,Schwarz, Gregory E..,...&Konrad, Christopher P..(2020).Low threshold for nitrogen concentration saturation in headwaters increases regional and coastal delivery.ENVIRONMENTAL RESEARCH LETTERS,15(4). |
MLA | Schmadel, Noah M.,et al."Low threshold for nitrogen concentration saturation in headwaters increases regional and coastal delivery".ENVIRONMENTAL RESEARCH LETTERS 15.4(2020). |
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