globalchange  > 气候变化事实与影响
DOI: 10.1002/2016GB005384
Scopus记录号: 2-s2.0-84979025784
论文题名:
Changes in anthropogenic nitrogen and phosphorus inputs to the St. Lawrence sub-basin over 110 years and impacts on riverine export
作者: Goyette J; -O; , Bennett E; M; , Howarth R; W; , Maranger R
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2016
卷: 30, 期:7
起始页码: 1000
结束页码: 1014
语种: 英语
英文关键词: historical nutrient budgets ; land use ; nitrogen ; phosphorus ; riverine nutrient loads ; water quality
Scopus关键词: anthropogenic effect ; environmental impact ; fertilizer application ; land use change ; mass balance ; nitrogen ; nutrient budget ; nutrient enrichment ; phosphorus ; river pollution ; water quality ; Saint Lawrence Basin
英文摘要: Human activities have increased the flow of nitrogen (N) and phosphorus (P) over much of the Earth, leading to increased agricultural production, but also the degradation of air, soil, and water quality. Here we quantify the sources of anthropogenic N and P inputs to 76 watersheds of the St. Lawrence Basin (SLB) throughout the 20th century using NANI/NAPI (net anthropogenic N/P input to watersheds), a mass balance modeling approach, and estimate the fraction of these inputs exported to adjacent rivers. Our results show that since 1901, NANI and NAPI increased 4.5-fold and 3.8-fold, respectively, with a peak in 1991 mainly due to high atmospheric N deposition and P fertilizer application. However, the relative increase over the course of the last century was much higher in certain watersheds, particularly those where there was greater urbanization. Ranges in NANI and NAPI vary greatly among watersheds (110 to 9351 kg N km−2 yr−1 and 0.16 to 1938 kg P km−2 yr−1, respectively in 2011) and are strongly related to riverine fluxes (R2 = 0.87 and 0.71 for N and P, respectively). Our results suggest that 22% of NANI (ranging from 11% to 68% across watersheds) and 17% of NAPI (ranging from 3% to 173%) are exported to rivers. Predominant sources of inputs vary spatially and through time largely due to changes in farming practices. By tracking the main sources of inputs to specific watersheds and through time, our work provides insights for N and P management. Reduction strategies will likely need to be watershed specific, although through time, our results clearly show the large-scale impact of targeted legislation. ©2016. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77840
Appears in Collections:气候变化事实与影响

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作者单位: Groupe de Recherche Interuniversitaire en Limnologie et en environnement aquatique, Département de Sciences Biologiques, Université de Montréal, Montréal, QC, Canada; Department of Natural Resource Sciences and McGill School of Environment, McGill University, Montréal, QC, Canada; Department of Ecology and Evolutionary Biology, Cornell University, Ithaca, NY, United States

Recommended Citation:
Goyette J,-O,, Bennett E,et al. Changes in anthropogenic nitrogen and phosphorus inputs to the St. Lawrence sub-basin over 110 years and impacts on riverine export[J]. Global Biogeochemical Cycles,2016-01-01,30(7)
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