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Nutrient loads from agricultural and forested areas in Finland from 1981 up to 2010-can the efficiency of undertaken water protection measures seen?
- Publication Year :
- 2017
-
Abstract
- Long-term data from a network of intensively monitored research catchments in Finland was analysed. We studied temporal (1981-2010) and spatial variability in nitrogen (N) and phosphorus (P), from 1987 losses, both from agricultural and forestry land. Based on trend analysis, total nitrogen (TN) concentrations increased in two of the four agricultural sites and in most of the forested sites. In agricultural catchments, the total phosphorus (TP) trends were decreasing in two of the four catchments studied. Dissolved P (DRP) concentrations increased in two catchments and decreased in one. The increase in DRP concentration can be a result of reducing erosion by increased non-plough cultivation and direct sowing. In forested catchments, the TP trends in 1987-2011 were significantly decreasing in three of the six catchments, while DRP concentrations decreased significantly in all sites. At the same time, P fertilisation in Finnish forests has decreased significantly, thus contributing to these changes. The mean annual specific loss for agricultural land was on average 15.5 kg ha(-1) year(-1) for N and 1.1 kg ha(-1) year(-1) for P. In the national scale, total TN loading from agriculture varied between 34,000-37,000 t year(-1) and total P loading 2400-2700 t year(-1) These new load estimates are of the same order than those reported earlier, emphasising the need for more efforts with wide-ranging and carefully targeted implementation of water protection measures.
- Subjects :
- RIVERS
Forests
010501 environmental sciences
01 natural sciences
Nutrient
Agricultural land
Mitigation measures
LOSSES
Finland
General Environmental Science
2. Zero hunger
4112 Forestry
Geography
Agriculture
04 agricultural and veterinary sciences
General Medicine
Nutrient loading
Pollution
CATCHMENTS
Trend analysis
LAND-USE CONFLICTS
PHOSPHORUS
Water quality
Erosion
Environmental Monitoring
Conservation of Natural Resources
Long-term monitoring
chemistry.chemical_element
Management, Monitoring, Policy and Law
Trend analyses
Water Movements
QUALITY
SURFACE WATERS
1172 Environmental sciences
0105 earth and related environmental sciences
Hydrology
business.industry
Phosphorus
Water
Sowing
15. Life on land
NITROGEN
CLIMATE
chemistry
Food
13. Climate action
DENMARK
040103 agronomy & agriculture
0401 agriculture, forestry, and fisheries
Environmental science
Spatial variability
business
Water Pollutants, Chemical
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....1a764df2aec2dbc1007ac5299439f70b