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DOI | 10.1016/j.scitotenv.2018.05.008 |
Nitrogen inputs drive nitrogen concentrations in US streams and rivers during summer low flow conditions | |
Bellmore, R. A.1,5; Compton, J. E.2; Brooks, J. R.2; Fox, E. W.2; Hill, R. A.3; Sobota, D. J.4; Thornbrugh, D. J.3,6; Weber, M. H.2 | |
发表日期 | 2018-10-15 |
ISSN | 0048-9697 |
卷号 | 639页码:1349-1359 |
英文摘要 | Ecological and human health impairments related to excess nitrogen (N) in streams and rivers remain widespread in the United States (U.S.) despite recent efforts to reduce N pollution. Many studies have quantified the relationship between N loads to streams in terms of N mass and N inputs towatersheds; however, N concentrations, rather than loads, are more closely related to impacts on human health and aquatic life. Additionally, concentrations, rather than loads, trigger regulatory responses. In this study, we examined how N concentrations are related to N inputs towatersheds (atmospheric deposition, synthetic fertilizer, manure applied to agricultural land, cultivated biological N fixation, and point sources), land cover characteristics, and stream network characteristics, including stream size and the extent of lakes and reservoirs. N concentration data were collected across the conterminous U.S. during the U.S. Environmental Protection Agency's 2008-09 National Rivers and Streams Assessment (n = 1966). Median watershed N inputs were 15.7 kg N ha(-1) yr(-1). Atmospheric deposition accounted for over half the N inputs in 49% of watersheds, but watersheds with the highest N input rates were dominated by agriculture-related sources. Total N input to watersheds explained 42% and 38% of the variability in total N and dissolved inorganic N concentrations, respectively. Land cover characteristics were also important predictors, with wetland cover muting the effect of agricultural N inputs on N concentrations and riparian disturbance exacerbating it. In contrast, stream variables showed little correlation with N concentrations. This suggests that terrestrial factors that can be managed, such as agricultural N use practices and wetland or riparian areas, control the spatial variability in stream N concentrations across the conterminous U.S. (C) 2018 Elsevier B.V. All rights reserved. |
英文关键词 | Inorganic nitrogen;Organic nitrogen;Watershed;Fertilizer;Atmospheric deposition;Land-use/land-cover |
语种 | 英语 |
WOS记录号 | WOS:000436806200130 |
来源期刊 | SCIENCE OF THE TOTAL ENVIRONMENT |
来源机构 | 美国环保署 |
文献类型 | 期刊论文 |
条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/60500 |
作者单位 | 1.US EPA, Natl Res Council, Western Ecol Div, 200 SW 35th St, Corvallis, OR 97333 USA; 2.US EPA, Natl Hlth & Environm Effects Res Lab, Western Ecol Div, 200 SW 35th St, Corvallis, OR 97333 USA; 3.US EPA, Oak Ridge Inst Sci & Educ, Western Ecol Div, 200 SW 35th St, Corvallis, OR 97333 USA; 4.Oregon Dept Environm Qual, Water Qual Program, 700 NE Multnomah St,Suite 600, Portland, OR 97232 USA; 5.Southeast Alaska Watershed Coalit, 1107 W 8th St,Ste 4, Juneau, AK 99801 USA; 6.Natl Pk Serv, Northern Great Plains Inventory & Monitoring Netw, 231 E St Joseph St, Rapid City, SD 57701 USA |
推荐引用方式 GB/T 7714 | Bellmore, R. A.,Compton, J. E.,Brooks, J. R.,et al. Nitrogen inputs drive nitrogen concentrations in US streams and rivers during summer low flow conditions[J]. 美国环保署,2018,639:1349-1359. |
APA | Bellmore, R. A..,Compton, J. E..,Brooks, J. R..,Fox, E. W..,Hill, R. A..,...&Weber, M. H..(2018).Nitrogen inputs drive nitrogen concentrations in US streams and rivers during summer low flow conditions.SCIENCE OF THE TOTAL ENVIRONMENT,639,1349-1359. |
MLA | Bellmore, R. A.,et al."Nitrogen inputs drive nitrogen concentrations in US streams and rivers during summer low flow conditions".SCIENCE OF THE TOTAL ENVIRONMENT 639(2018):1349-1359. |
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