DOI: 10.5194/hess-19-3475-2015
Scopus记录号: 2-s2.0-84938872512
论文题名: Long-term monitoring of nitrate transport to drainage from three agricultural clayey till fields
作者: Ernstsen V ; , Olsen P ; , Rosenbom A ; E
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2015
卷: 19, 期: 8 起始页码: 3475
结束页码: 3488
语种: 英语
Scopus关键词: Agriculture
; Atmospheric temperature
; Catchments
; Crops
; Cultivation
; Environmental regulations
; Fertilizers
; Groundwater
; Water conservation
; Water management
; Water quality
; Agricultural management
; Agricultural practices
; Aquatic environments
; Concentration Measurement
; Long term monitoring
; Nitrate concentration
; Temperature dependent
; Water Framework Directives
; Nitrates
; agricultural management
; agricultural runoff
; air temperature
; aquatic environment
; clay soil
; concentration (composition)
; crop production
; drainage
; environmental monitoring
; European Union
; fertilizer application
; hydrogeology
; long-term change
; nitrate
; nitrogen
; pollutant transport
; precipitation (climatology)
; tile drain
; till
; water management
; water quality
; Denmark
英文摘要: The application of nitrogen (N) fertilisers to crops grown on tile-drained fields is required to sustain most modern crop production, but it poses a risk to the aquatic environment since tile drains facilitate rapid transport pathways with no significant reduction in nitrate. To maintain the water quality of the aquatic environment and the provision of food from highly efficient agriculture in line with the EU's Water Framework Directive and Nitrates Directive, field-scale knowledge is essential for introducing water management actions on-field or off-field and producing an optimal differentiated N-regulation in future. This study strives to provide such knowledge by evaluating on 11 years of nitrate-N concentration measurements in drainage from three subsurface-drained clayey till fields (1.3-2.3 ha) representing approximately 71 % of the surface sediments in Denmark dominated by clay. The fields differ in their inherent hydrogeological field settings (e.g. soil-type, geology, climate, drainage and groundwater table) and the agricultural management of the fields (e.g. crop type, type of N fertilisers and agricultural practices). The evaluation revealed three types of clayey till fields characterised by: (i) low net precipitation, high concentration of nitrate-N, and short-term low intensity drainage at air temperatures often below 5 °C; (ii) medium net precipitation, medium concentration of nitrate-N, and short-term medium-intensity drainage at air temperatures often above 5°C; and (iii) high net precipitation, low concentration of nitrate-N and long-term high intensity drainage at air temperatures above 5°C. For each type, on-field water management actions, such as the selection of crop types and introduction of catch crops, appeared relevant, whereas off-field actions only seemed relevant for the latter two field types given the temperature-dependent reduction potential of nitrate off-field. This initial well-documented field-scale knowledge from fields that are representative of large areas in Denmark is a first step towards establishing a differentiated N-regulation for clayey till areas. Additionally, it provides a unique starting point by identifying important parameters for future mapping of catchment-scale variations in nitrate concentrations and fluxes. © Author(s) 2015. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/78450
Appears in Collections: 气候变化事实与影响
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作者单位: Geological Survey of Denmark and Greenland, Øster Voldgade 10, Copenhagen, Denmark; Aarhus University, Department of Agroecology, Blichers Allé 20, Tjele, Denmark
Recommended Citation:
Ernstsen V,, Olsen P,, Rosenbom A,et al. Long-term monitoring of nitrate transport to drainage from three agricultural clayey till fields[J]. Hydrology and Earth System Sciences,2015-01-01,19(8)