Publikasjoner
NIBIOs ansatte publiserer flere hundre vitenskapelige artikler og forskningsrapporter hvert år. Her finner du referanser og lenker til publikasjoner og andre forsknings- og formidlingsaktiviteter. Samlingen oppdateres løpende med både nytt og historisk materiale. For mer informasjon om NIBIOs publikasjoner, besøk NIBIOs bibliotek.
2001
Authors
Trond HaraldsenAbstract
Det er ikke registrert sammendrag
Abstract
The International Symposium: Snowmelt erosion and related problems were held in Oslo, 28- 30 March 2001. The symposium was organised by Centre for Soil and Environmental Research and Department of Soil and Water Science at the Agricultural University of Norway . The Symposium was arranged in cooperation with IGU: International Geograpical Union, ESSC, European Society of Soil Conservation, COST 623: Soil erosion and global change. The symposium was also supported by The Ministry of Agriculture and the Norwegian Research Council. The different sessions of the symposium focused upon; Hydrological processes in frozen and partly frozen soils, Soil erosion measurement, processes and influencing factors, Modelling of infiltration, runoff and soil erosion during winter periods. Abstract from paper and poster presentations can be found in the Abstract Book from the Symposium, Jordforsk Report 41/01. The symposium also included one day with field excursion to sites in south eastern Norway where Centre for Soil and Environmental Research and Department of Soil and Water Science at the Agricultural University of Norway have their soil erosion experiments. This report present the excursion program and abstracts and summaries of presentations given at the excursion .
Abstract
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– Vurdering av bruk av pesticider ved grunnvannsanlegget til Eide kommunale vannverk.
Ketil Haarstad
Authors
Ketil HaarstadAbstract
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Authors
Håkon BorchAbstract
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Abstract
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Abstract
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Abstract
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Abstract
Materials and Methods: In the field, fresh samples were obtained from different sources. Lake samples were collected from Lake Årungen, which is located in Ås. Stream samples were collected from Ås and Birkenes in southern Norway. All the samples were filtered in the field through 0.45 um membrane filters using syringes. Then the samples were fractionated through Bond Elut SCX cartridges connected to a portable vacuum pump, based on the method of Wickstrøm et al. (2000). A portion of the sample was passed immediately through the cation exchange cartridge. After the fieldwork another portion of the sample was taken to the laboratory where the same fractionation procedure was applied. These two fractions were then analysed for non-labile aluminium. A portion of the unfractionated sample was also analysed for total dissolved aluminium. An additional laboratory fractionation with a time lag was also applied to observe storage effects. Subsequent determination of total elements was done using ICP-AES. Transport, pretreatment and storage can also have an effect on the pH and organic matter concentration of the samples and, through this, on the equilibrium between different Al fractions. To evaluate pH differences prior to analysis, pH values were also measured in the field and in the laboratory. DOC was also determined. Differences between fractionation in the field and fractionation in the laboratory: In this study, non-labile fractions of Al were compared instead of the labile fractions of Al (which can be removed from solution on passage through cation exchange column) that are believed to have the greatest toxic effect on organisms.
Abstract
Understanding sulfate transport and retention dynamics in forest soils is a prerequisite in predicting SO4 concentration in the soil solution and in lake and stream waters. In this study forest soil samples from the Grdsjn catchment, Sweden, were used to study SO4 transport in soil columns from the upper three soil horizons (E, Bs and BC).The columns were leached using a sequential leaching technique. The input solutions were CaSO4 equilibrated with forest floor material. Leaching behavior of SO4 and concentration in the effluent were measured from columns from individual horizons.SO4 was always retained in the Bs and BC horizons, while the pattern for the E horizon varied. Attempts were also made to model SO4 breakthrough results based on miscible displacement approaches and solute convection-dispersion equation (CDE) in porous media. Several retention mechanisms were incorporated into the CDE in order to account for possible reversible and irreversible SO4 reactions in individual soil layers.The model was not successful in describing the mobility of SO4 in the top (E) horizon. Moreover, a linear equilibrium approach was generally inadequate for describing sulfate mobility in the Bs and BC horizons whereas improved model descriptions were obtained when non-linear equilibrium and kinetic approaches were utilized.We conclude that sulfate retention during transport in this forest soil is most likely controlled by kinetic reactivity of SO4 by reversible and irreversible mechanisms.