Abstract
Weathering and acidification processes have been studied in a podzol profile developed on sand by two approaches: A mineralogical method using quartz as an internal standard was used to determine the mean weathering rate during a postglacial period of 9400 years. The annual loss was found to be 3.2 g/m{sup 2}. The release of elements due to silicate weathering was calculated from depletion curves, and the average annual release of Na+K+Mg+Ca for the period was 19 meq/m{sup 2}. Due to disintegration of rock fragments, the particle size distribution has changed drastically in the upper part of the profile, and minerals have been transferred from sand fraction to silt and clay fractions. The most important weathering processes are the total breakdown of trioctahedral chlorite and biotite and the transformation of dioctahedral mica (muscovite-phengite) to a regularly interstratified mineral and further to Al-vermiculite or smectite. A column experiment with 27 ``undisturbed`` 40 cm long soil monoliths was carried out at a temperature of 8{sup o}C. The results from the first 168 weeks are reported. With some exceptions, the columns were treated close to field condition to attain a steady state on the ion exchangers in a reasonable time perspective. At the end
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Citation Formats
Teveldal, S.
Investigation of a sandy soil from southern Norway considering weathering and acidification processes; Undersoekelser av en sandjord fra Nordmoen, Romerike, med hensyn til forvitring og forsurning.
Norway: N. p.,
1993.
Web.
Teveldal, S.
Investigation of a sandy soil from southern Norway considering weathering and acidification processes; Undersoekelser av en sandjord fra Nordmoen, Romerike, med hensyn til forvitring og forsurning.
Norway.
Teveldal, S.
1993.
"Investigation of a sandy soil from southern Norway considering weathering and acidification processes; Undersoekelser av en sandjord fra Nordmoen, Romerike, med hensyn til forvitring og forsurning."
Norway.
@misc{etde_10147847,
title = {Investigation of a sandy soil from southern Norway considering weathering and acidification processes; Undersoekelser av en sandjord fra Nordmoen, Romerike, med hensyn til forvitring og forsurning}
author = {Teveldal, S}
abstractNote = {Weathering and acidification processes have been studied in a podzol profile developed on sand by two approaches: A mineralogical method using quartz as an internal standard was used to determine the mean weathering rate during a postglacial period of 9400 years. The annual loss was found to be 3.2 g/m{sup 2}. The release of elements due to silicate weathering was calculated from depletion curves, and the average annual release of Na+K+Mg+Ca for the period was 19 meq/m{sup 2}. Due to disintegration of rock fragments, the particle size distribution has changed drastically in the upper part of the profile, and minerals have been transferred from sand fraction to silt and clay fractions. The most important weathering processes are the total breakdown of trioctahedral chlorite and biotite and the transformation of dioctahedral mica (muscovite-phengite) to a regularly interstratified mineral and further to Al-vermiculite or smectite. A column experiment with 27 ``undisturbed`` 40 cm long soil monoliths was carried out at a temperature of 8{sup o}C. The results from the first 168 weeks are reported. With some exceptions, the columns were treated close to field condition to attain a steady state on the ion exchangers in a reasonable time perspective. At the end of the first year a considerable mineralization and nitrification started which overrides the pH-differences in the ``rain`` solutions. The acidification of the soil could be followed through the chemistry in the bottom outlets. Preliminary results indicate a weathering rate in the columns which is 3-4 times higher than the mean value determined in the first work. This difference is not big taking into account the favorable conditions in the columns. It is concluded that input of mineral nutrients from weathering and deposition together may be less than the loss through leaching and wood increment}
place = {Norway}
year = {1993}
month = {May}
}
title = {Investigation of a sandy soil from southern Norway considering weathering and acidification processes; Undersoekelser av en sandjord fra Nordmoen, Romerike, med hensyn til forvitring og forsurning}
author = {Teveldal, S}
abstractNote = {Weathering and acidification processes have been studied in a podzol profile developed on sand by two approaches: A mineralogical method using quartz as an internal standard was used to determine the mean weathering rate during a postglacial period of 9400 years. The annual loss was found to be 3.2 g/m{sup 2}. The release of elements due to silicate weathering was calculated from depletion curves, and the average annual release of Na+K+Mg+Ca for the period was 19 meq/m{sup 2}. Due to disintegration of rock fragments, the particle size distribution has changed drastically in the upper part of the profile, and minerals have been transferred from sand fraction to silt and clay fractions. The most important weathering processes are the total breakdown of trioctahedral chlorite and biotite and the transformation of dioctahedral mica (muscovite-phengite) to a regularly interstratified mineral and further to Al-vermiculite or smectite. A column experiment with 27 ``undisturbed`` 40 cm long soil monoliths was carried out at a temperature of 8{sup o}C. The results from the first 168 weeks are reported. With some exceptions, the columns were treated close to field condition to attain a steady state on the ion exchangers in a reasonable time perspective. At the end of the first year a considerable mineralization and nitrification started which overrides the pH-differences in the ``rain`` solutions. The acidification of the soil could be followed through the chemistry in the bottom outlets. Preliminary results indicate a weathering rate in the columns which is 3-4 times higher than the mean value determined in the first work. This difference is not big taking into account the favorable conditions in the columns. It is concluded that input of mineral nutrients from weathering and deposition together may be less than the loss through leaching and wood increment}
place = {Norway}
year = {1993}
month = {May}
}