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Phase partitioning of ammonium in Australian and European forest soils

Title data

Smethurst, Philip J. ; Matschonat, Gunda ; Ballard, Linda M. ; Dingle, Joanne K.:
Phase partitioning of ammonium in Australian and European forest soils.
In: Communications in Soil Science and Plant Analysis. Vol. 30 (1999) Issue 13-14 . - pp. 2023-2034.
ISSN 0010-3624
DOI: https://doi.org/10.1080/00103629909370350

Abstract in another language

An understanding of phase partitioning of ammonium (NH4) in soils is one of a number of parameters needed to predict the consequences of nitrogen (N) inputs from atmospheric deposition or the application of fertilizers, and for predicting NH4 uptake by roots. However, very few data are available on solid-liquid partition coefficients (Kd) for NH4. The main aims of this study were to determine and compare the Kd values for NH4 in a variety of soils and horizons from Australia and Europe. A Freundlich function was fitted to the sorption or desorption data for each sample and the Kd value calculated at three concentrations (0.001, 0.1, and 1 mM). The Australian study indicated that, although site differences in Kd values were evident at 0.1 mM, variability was too high to distinguish site effects at other concentrations, or depth and plot effects at any concentration. Depth effects were evident at one of the European sites. Despite samples of contrasting origin and different methods of measurement, there was similarity in the Kd values at 0.1 mM for most mineral soils. Organic horizons had higher Kd values at 0.1 mM (8.7-26.2 mL g-1) than most mineral soils (0.3-7.4 mL g-1), but mineral soil at one site had a particularly high Kd value (36.9 mL g-1). In common with other solutes, NH4 concentrations were well buffered at low concentrations (M), but improved precision and accuracy of NH4 measurements at low concentrations will be needed to further improve our knowledge of partitioning at these concentrations.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER7394
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Soil Ecology
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 22 Oct 2015 07:29
Last Modified: 22 Oct 2015 07:29
URI: https://eref.uni-bayreuth.de/id/eprint/20683