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Proc. of Int. Workshop on Evaluation and Sustainable Management of Soil Carbon Sequestration in Asian Countries: Properties of Indonesian Peat in Relation to the Chemistry of Carbon Emission.

The discussion is focused on several properties of peat, such as the composition of peat materials, critical water content in relation to irreversible drying, concentration of -COOH, and the chemistry of C emission as a result of the reduction and oxidation processes of peat materials. The experiments were divided into two steps: (i) laboratory experiments and (ii) field experiments. For the laboratory experiments, peat samples of fibric, heroic and sapric decomposition degrees were taken from Jambi, Sumatra and Central Kalimantan. In the field, the experiments were focused in Central Kalimantan. Based on the research results, the composition of peat material is rather similar, being mostly rich in wood containing high content of lignin that varies from 65 to 80% for the peats of Jambi, and 78 to 93% for the peats of Central Kalimantan. The content of cellulose was mostly less than 10%, while hemi-cellulose and protein were not detected. The main organic acids, as a result of lignin biodegradation and the sources of C-release, are of the aromatic group consisting mainly of derivative phenolic acids. The concentration of such organic acids ranging from the highest to the lowest is as follows: ferulic acid > synapic acid > p-coumaric acid > p-hydroxybenzoic acid > vanilic acid > syringic acid. The drying and wetting processes on the peat materials affected the stability of organic acids, which was indicated by the loss of C through CO2 and CH4 releases. The release of CO2 and CH4 from fibric peat was higher than that from hemic and sapric peats. To solve such problems, the addition of metal ion (Fe3+) as an ameliorant to the peat at a certain dosage was used. In the field experiments, the use of mineral soil and basic slag at the rate of 5% maximum Fe3+-sorption decreased the total of C-emission from peat of about 28 to 31%.

2010 Bogor, Indonesia Sept. 28-29, 2010
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Author:Sabiham, Supiandi
Publication:Borneo Research Bulletin
Article Type:Reprint
Date:Jan 1, 2011
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