Distributed, high-resolution modelling of critical source areas for erosion and phosphorus losses

Sammanfattning

Phosphorus losses from arable land need to be reduced to prevent eutrophication of surrounding waters. Owing to the high spatial variability of P losses, cost-effective countermeasures need to target parts of the catchment that are most susceptible to P losses. Field surveys identified critical source areas for overland flow and erosion amounting to only 0.4-2.6 % of total arable land in four different catchments in southern Sweden. Distributed modelling using high-resolution digital elevation data identified 72-96 % of these observed erosion and overland flow features. The modelling results were also successfully used to predict occurrence of overland flow and rill and gully erosion in a catchment in central Sweden. Such exact high-resolution modelling allows for accurate placement of planned countermeasures. However, current legislative and environmental subsidy programmes need to change their approach from income-loss compensation to rewarding high cost effectiveness of implemented countermeasures.

Nyckelord

Erosion; Modelling; Phosphorus; Eutrophication

Publicerad i

AMBIO: A Journal of the Human Environment
2015, volym: 44, nummer: 2, sidor: S241-S251
Utgivare: SPRINGER

SLU författare

• Djodjic, Faruk

  • Institutionen för vatten och miljö, Sveriges lantbruksuniversitet
    

• Villa Solis, Ana

  • Institutionen för vatten och miljö, Sveriges lantbruksuniversitet
    

Globala målen (SDG)

SDG6 Rent vatten och sanitet för alla

UKÄ forskningsämne

Miljövetenskap

Publikationens identifierare

• DOI: https://doi.org/10.1007/s13280-014-0618-4

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/68128