Effects and Mechanism of Organic Acids on Aluminum Availability of Dark Brown Forest Soil

Abstract:

The effects and mechanism of different concentration organic acids and organic salts solution on Al availability of dark brown forest soil were studied. It was resulted that, oxalic acid/oxalate and citric acid/citrate substantially stimulated soil Al release of dark brown forest soil. The effect of organic acids/salts on Al release would be strengthen with increasing of their concentrations.The contents of Al released from A1 horizon was higher than that from B horizon. Organic salt solutions had much higher effects than organic acid the same in concentration, i.e. citrate>citric acid, oxalate>oxalic acid. Therefore, the mechanism of organic acid/salts triggering release of soil Al was assumed to be dominated by complexation reactions of organic anions. Citric acid/ citrate had much higher effect than oxalic acid/ oxalate at same concentration to A1 and B horizons, i.e. citrate> oxalate, citric acid>oxalic acid, which was primarily related with the greater complexing capacities and dissociation constants of citric acid.

• Periodical: Advanced Materials Research (Volumes 393-395)
• Pages: 709-712
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.393-395.709
• Online since: November 2011
• Authors: Fu Xing Cui, Jin Feng Song, Ya Fen Guo, Jin Zhong Xu
• Keywords: Aluminum Release, Dark Brown Forest Soil, Organic Acids, Organic Salts

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