Long-term (2001-2020) nutrient transport from a small boreal agricultural watershed - hydrological control and potential of retention ponds

Autor: Lauri Arvola, Jussi Huotari, Sari Uusheimo, Tiina Tulonen
Přispěvatelé: Biological stations, Lammi Biological Station
Jazyk: angličtina
Rok vydání: 2020
Předmět:
lcsh:Hydraulic engineering
010504 meteorology & atmospheric sciences
Geography
Planning and Development
chemistry.chemical_element
010501 environmental sciences
Aquatic Science
01 natural sciences
Biochemistry
chemistry.chemical_compound
lcsh:Water supply for domestic and industrial purposes
Nutrient
REMOVAL
Nitrate
lcsh:TC1-978
nutrients
nitrate
QUALITY
WETLAND
Precipitation
DEPOSITION
0105 earth and related environmental sciences
Water Science and Technology
phosphate
2. Zero hunger
lcsh:TD201-500
Phosphorus
NITROGEN-RETENTION
15. Life on land
Sedimentation
FINLAND
Phosphate
6. Clean water
agricultural watershed
CATCHMENTS
loading
PHOSPHORUS
Deposition (aerosol physics)
Agronomy
chemistry
Boreal
TEMPORAL TRENDS
13. Climate action
PRECIPITATION
1181 Ecology
evolutionary biology
Environmental science
ponds
Zdroj: Water
Volume 12
Issue 10
Water, Vol 12, Iss 2731, p 2731 (2020)
Popis: Agriculture contributes significantly to phosphorus and nitrogen loading in southern Finland. Climate change with higher winter air temperatures and precipitation may also promote loading increase further. We analyzed long-term nutrient trends (2001&ndash
2020) based on year-round weekly water sampling and daily weather data from a boreal small agricultural watershed. In addition, nutrient retention was studied in a constructed sedimentation pond system for two years. We did not find any statistically significant trends in weather conditions (temperature, precipitation, discharge, snow depth) except for an increase in discharge in March. Increasing trends in annual concentrations were found for nitrate, phosphate, and total phosphorus and total nitrogen. In fact, phosphate concentration increased in every season and nitrate concentration in other seasons except in autumn. Total phosphorus and total nitrogen concentrations increased in winter as well and total phosphorus also in summer. Increasing annual loading trend was found for total phosphorus, phosphate, and nitrate. Increasing winter loading was found for nitrate and total nitrogen, but phosphate loading increased in winter, spring, and summer. In the pond system, annual retention of total nitrogen was 1.9&ndash
4.8% and that of phosphorus 4.3&ndash
6.9%. In addition, 25&ndash
40% of suspended solids was sedimented in the ponds. Our results suggest that even small ponds can be utilized to decrease nutrient and material transport, but their retention efficiency varies between years. We conclude that nutrient loading from small boreal agricultural catchments, especially in wintertime, has already increased and is likely to increase even further in the future due to climate change. Thus, the need for new management tools to reduce loading from boreal agricultural lands becomes even more acute.
Databáze: OpenAIRE
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