Effects of heating and autoclaving on sorption and desorption of phosphorus in some forest soils |
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| Authors: | I Serrasolses J Romanyà P K Khanna |
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| Institution: | 1.CEAM Fundación Centro de Estudios Ambientales del Mediterráneo,Paterna,Spain;2.Department of Natural Products Plant Biology and Soil Science,Universitat de Barcelona,Barcelona,Spain;3.Institute of Silviculture,University of Freiburg,Freiburg,Germany;4.CSIRO Forestry and Forest Products,Kingston,Australia;5.Unitat d’Ecologia, Facultat de Biociències,Universitat Autònoma de Barcelona,Bellaterra,Spain |
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| Abstract: | A number of biological and chemical processes may affect soil phosphorus availability when forest fires occur, partly as a
result of heating. We describe here a laboratory experiment to study the effects of soil heating on changes in sorption and
desorption of P. Autoclaving was also included as an additional treatment of moist heating under pressure. Five forest soils
(two Podzols, one Arenosol, one Luvisol and one Alisol) were heated to 60°C, 120°C and 250°C or autoclaved for 30 min. They
were repeatedly extracted with Bray I and analysed for inorganic and organic P fractions. The desorbed P data were fitted
to an asymptotic exponential equation to obtain the desorption rate and capacity parameters. Podzol and Arenosol soils showed
a quick P desorption after heating, while Luvisol and Alisol soils showed a slow desorption rate. The immediate increase in
available P that occurred after heating or autoclaving originated mostly from solubilisation of microbial metabolites and
soil organic components. Autoclaving decreased P sorption capacity in all soils, but the effects of heating on P sorption
differed among soils. Except for one of the soils, the low P-fixing soils (Podzol and Arenosol) showed a decrease in P sorption
when heated to high temperatures, whereas the high P-fixing soils (Luvisol and Alisol) showed little changes after heating.
Fire intensity and soil characteristics are important factors determining short-term and long-term soil P dynamics. |
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| Keywords: | P adsorption P desorption Autoclaving Soil heating Forest fire |
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