From single fields to river basins: Identification of critical source areas for erosion and phosphorus losses at high resolution

Sammanfattning

Concentrations of phosphorus (P), the main limiting nutrient in freshwater ecosystems, need to be reduced, but this is difficult due to high spatial and temporal variations and limited resources. Reliable targeting of critical source areas, such as erosion-prone fields and parts of fields, is necessary to improve the cost efficiency of mitigation measures. We used high-resolution (2 m x 2 m) distributed modelling to calculate erosion risk for a large area (202 279 km(2)) covering > 90% of Swedish arable land. Comparison of model results with independent farmers' observations in a pilot catchment showed high spatial agreement. The modelled worst case scenario produced reasonable quantitative results comparable to measured 90th percentile values of suspended sediment (SS) loads at both field and small catchment scale (R-2 = 0.81, p < 0.001). Overall, loads of SS, especially during extreme episodes, strongly governed losses of unreactive P and total P at both field and catchment scale.

Nyckelord

Critical source areas; Distributed modelling; Erosion; High-resolution; Phosphorus

Publicerad i

AMBIO: A Journal of the Human Environment
2019, volym: 48, nummer: 10, sidor: 1129-1142
Utgivare: SPRINGER

SLU författare

• Djodjic, Faruk

  • Institutionen för vatten och miljö, Sveriges lantbruksuniversitet
    

• Markensten, Hampus

  • Institutionen för vatten och miljö, Sveriges lantbruksuniversitet
    

UKÄ forskningsämne

Oceanografi, hydrologi, vattenresurser

Publikationens identifierare

• DOI: https://doi.org/10.1007/s13280-018-1134-8

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/101613