Abstract
Massive expansion of abandoned bamboo stands has been observed recently in various parts of Japan, and the original forests change to bamboo stands. In order to comprehend the transition of the carbon storage of forest ecosystem, when the abandoned bamboo stands invade surrounding forests, the biomass and carbon storage of three abandoned bamboo stands in Gifu Prefecture were estimated. In the results of this research, the aboveground biomass of abandoned bamboo stands was from 35.1t/ha to 69.2t/ha for curms and from 7.0t/ha to 17.4t/ha for leaves and branches. The total aboveground biomass was from 42.1t/ha to 83.5t/ha, within the range of the results of existing research. The litterfall biomass was 4.68t/ha and 5.75t/ha. The belowground biomass was from 10.4t/ha to 25.7t/ha for stumps, from 26.0t/ha to 34.5t/ha for rhizomes and from 40.2t/ha to 53.4t/ha for fine roots. The total belowground biomass was from 89.1t/ha to 98.5t/ha, that was larger than that of existing research. The carbon content rate of Phyllostachys pubescens was 48.9% for curms, 48.2% for branches, 45.2% for leaves, 45.6% for rhizomes and 44.8% for fine roots. The carbon storage of soil in abandoned bamboo stands was from 54.9t/ha to 113.8t/ha. Total carbon storage of abandoned bamboo stands ecosystem except soil carbon storage was less than that of the other vegetation forest ecosystem. When the abandoned bamboo stands invade surrounding forest, the carbon storage of new forming bamboo stands might become below the half compared with that of original forests.
