Development of an in-situ decay model of dead wood in light of rotting type of white- and brown-rot

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To improve the accuracy of the estimation of the carbon stock in deadwood pool, which is obligatory accounting for Kyoto Protocol under United Nation Framework Convention on Climate Change, we developed the quantifying method to measure the lignin and holocellulose content using near-infrared spectroscopy. To adapt this method for the samples which had been previously gathered from north to south in Japan, we have obtained deadwood database with the information about climate, years after death, density of wood, lignin, and holocellulose content. According to this database, the decomposition rate of lignin does not remarkably differ from that of holocellulose. The alkali-extractable component does not markedly increase with the increase in the years after death, indicating that the white rot type is more frequent in the decay of dead wood in Japanese coniferous species. Using these results, we constructed the in-situ decay model of dead wood in light of rotting type.