文献类型： 外文期刊
作者： Chen, Xueli 1 ; Bechmann, Marianne 3 ;
作者机构： 1.Heilongjiang Acad Agr Sci, Inst Soil Fertilizer & Environm Resource, Harbin 150086, Peoples R China
2.Heilongjiang Acad Agr Sci Postdoctoral Programme, Harbin 150086, Peoples R China
3.Norwegian Inst Bioecon Res, POB 115, N-1431 As, Norway
关键词： nitrogen; nitrate losses; catchment; agriculture; Norway; climate change
期刊名称：ROYAL SOCIETY OPEN SCIENCE （ 影响因子：2.963； 五年影响因子：3.44 ）
ISSN： 2054-5703
年卷期： 2019 年 6 卷 12 期
页码：
收录情况： SCI
摘要： Nitrogen (N) losses from agricultural areas, especially into drinking water and marine environments, attract substantial attention from governments and scientists. This study analysed nitrogen loss from runoff water using long-term monitoring data (1994-2016) from the Skuterud catchment in southeastern Norway and the Naurstad catchment in northern Norway. Precipitation and runoff were lower in the Skuterud catchment than in the Naurstad catchment. However, in the Skuterud catchment, the annual total N (TN) losses ranged from 27 to 68 kg hm(-2). High precipitation (1247 mm) in the Naurstad catchment resulted in substantial runoff water (1108 mm) but relatively low total TN losses ranged from 17 to 35 kg hm(-2). The proportion of nitrate losses to TN loss was 51-86% and 28-50% in the Skuterud and Naurstad catchments, respectively. Furthermore, the monthly average TN concentrations and nitrate losses had two peaks, in April-May and October, in the Skuterud catchment; however, no significant fluctuations were found in the Naurstad catchment. The contributions of N and runoff water to TN and nitrate losses were calculated using multiple linear regression, and runoff water was the major contributor to TN loss in both catchments. Runoff water was the main factor in the Skuterud catchment, and the nitrate-N concentration was the main factor in the Naurstad catchment.
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