Back to employees
NO EN

Marianne Bechmann

Research Professor

NIBIO Publications
NIBIO Projects

Division of Environment and Natural Resources

Soil and Land Use

(+47) 412 19 506
marianne.bechmann@nibio.no

Place
Ås O43

Visiting address
Oluf Thesens vei 43, 1433 Ås

Attachments

CV per September 2018

Links

Kjelle plot study site The Agricultural Environmental Monitoring programme (JOVA) Klima- og tiltaksveileder i landbruket

Biography

Agricultural effects on water quality. Nutrient losses from agriculture and effects of mitigation measures to reduce nutrient losses. Monitoring of diffuse pollution from small agricultural catchments. Identification of critical source areas. Implementation of mitigation strategies. Estimation of cost-effectiveness of mitigation measures.

Read more
To document

Authors

Jian Liu Hilmar Tor Sævarsson Marianne Bechmann Tore Krogstad Tomas Persson Anne Falk Øgaard

Abstract

Purpose Losses of phosphorus (P) and carbon (C) from livestock farming impair downstream water quality, requiring a better understanding of their leaching processes. The aim of the study was to examine how leaching of P (total dissolved P – TDP; dissolved reactive P – DRP; dissolved organic P – DOP) and dissolved organic C (DOC) was affected by soil type, chemical property and amendment. Methods Leaching experiments with simulated rain were conducted on five different mineral and organic soils before and after a manure or mineral fertilizer application, respectively. The soils were: Fluvisol, Stagnosol, Umbrisol, Histosol (Ruptic), and Histosol. Profile-long soil columns were used, and chemistry of soil and water samples were studied. Results Before the P addition, the Histosol (Ruptic) soil with high P and organic matter contents but low sorption in the subsoil had significantly greatest flow-weighted mean concentrations (FWMCs) of TDP (315 versus 33‒48 µg L‒1), DRP (215 versus 5‒26 µg L‒1), DOP (101 versus 19‒33 µg L‒1) and DOC (46 versus 8‒25 mg L‒1) in drainage water among all soils. Leaching of DOC varied more than TDP, DRP and DOP across most soils. The manure application significantly elevated FWMCs-TDP in three soils than before the application and led to greater FWMCs-TDP in all soils and FWMCs-DOC in most soils than mineral fertilizer did. The ratios of DRP to DOP and to TDP were significantly correlated to whole-profile degree of P saturation (DPS) of the soils (R2 > 0.9, p < 0.05). Conclusion Sorption/desorption characteristics of subsoils greatly affected concentrations and loads of P and DOC in drainage, as well as the ratios of DRP to DOP and to TDP. Therefore, sorption/desorption characteristics and DPS of subsoils should be included in the work of assessing dissolved P and DOC leaching and developing nutrient mitigation measures.

Authors

Hanne Ugstad Marie-Cecile Gruselle Marianne Bechmann Franziska Fischer

Abstract

No abstract has been registered

To document

Authors

Jian Liu Faruk Djodjic Barbro Ulén Helena Aronsson Marianne Bechmann Lars Bergström Tore Krogstad Katarina Kyllmar

Abstract

No abstract has been registered

Expand my NIBIO publications
My finished projects