Colonization and decomposition of leaf litter by ligninolytic fungi in Acacia mangium plantations and adjacent secondary forests |
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Authors: | Yusuke Hagiwara Takashi Osono Seiichi Ohta Agus Wicaksono Arisman Hardjono |
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Institution: | (1) Laboratory of Forest Ecology, Division of Environmental Science and Technology, Graduate School of Agriculture, Kyoto University, Kitashirakawaoiwake-cho, Sakyo-ku, Kyoto 606-8502, Japan;(2) Center for Ecological Research, Kyoto University, Shiga 520-2113, Japan;(3) Laboratory of Tropical Forest Resources and Environment, Division of Forest and Biomaterial Science Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, Japan;(4) P.T. Musi Hutan Persada, Muara Enim, South Sumatra, Indonesia |
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Abstract: | Colonization of leaf litter by ligninolytic fungi and relationships between mass loss and chemical qualities of surface leaf
litter were examined in Acacia mangium plantations and adjacent secondary forests in southern Sumatra Island, Indonesia. Leaves were collected from eight A. mangium plantations of different ages and three secondary forests. Partly decomposed leaves beneath the surface leaf litter were
used to measure the bleached area which indicated colonization by ligninolytic fungi. Surface leaf litter was used to measure
initial chemical content and subjected to the pure culture decomposition test. The bleached area was greater in secondary
forests than in A. mangium plantations. Nitrogen content was higher in all the A. mangium plantations than in the secondary forests, and acid unhydrolyzable residue (AUR) content was generally higher in the A. mangium plantations than in the secondary forests. The bleached area of leaf litter was negatively correlated with nitrogen content
of surface leaf litter at all sites, indicating an inhibition of the colonization by ligninolytic fungi of leaves with higher
nitrogen content. In a pure culture decomposition test inoculating a ligninolytic fungus to surface leaf litter, mass loss
of leaves was negatively correlated with AUR content of surface leaf litter. Mass loss of leaves and AUR was not significantly
related to nitrogen content. These results suggested that higher nitrogen content in A. mangium leaf litter had a negative effect by colonization of ligninolytic fungi, but the effect of high N in A. mangium leaf litter on the decomposition of leaf litter and AUR remained unsolved. |
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