期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 595, 期 -, 页码 325-336出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2017.03.114
关键词
Nitrate reduction; Groundwater; Modelling; Spatially targeted regulation; Uncertainty
资金
- BONUS, the joint Baltic Sea research and development programme - EU [185]
- BONUS, the joint Baltic Sea research and development programme - Innovation Fund Denmark [185]
- Swedish Environmental Protection Agency
- Polish National Centre for Research and Development
- German Ministry for Education and Research
- Russian Foundation for Basic Researches (RFBR)
Denmark must further decrease the N-load to coastal waters from agricultural areas to comply with the Baltic Sea Action Plan and the EU Water Framework Directive. A new spatially targeted regulation is under development that focuses on locating N-mitigation measures in areas with low natural reduction of nitrate (N-reduction). A key tool in this respect is N-reduction maps showing how much N is removed by natural reduction processes, i.e. the ratio between the N-load out of the catchment and the N-leaching from the root zone for each spatial unit within the catchment. For the 85 km(2) groundwater dominated Norsminde catchment in Denmark we have analysed the potential benefits of a spatially targeted regulation and how its efficiency is affected by uncertainty in the N-reduction map. Our results suggest that there are potential benefits of implementing a spatially targeted regulation compared to a spatially uniform regulation. The total N-load at the catchment outlet can be decreased up to 8% by relocating the existing agricultural practice according to the N-reduction map and thus without decrease fertilization inputs. A further decrease in N-load can be obtained by identifying target areas with low N-reduction where N-mitigation measures must be applied. Uncertainty on the N-reduction map is found to lower the efficiency of spatially targeted regulation. This uncertainty can be lowered substantially by using the mean of an ensemble of N-reduction maps. The uncertainty decreases with coarser spatial resolution of the N-reduction map, but this will at the same time decrease the benefit from spatially targeted regulation. (C) 2017 Elsevier B.V. All rights reserved.
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