Abstract
Decomposition processes of Camellia japonica leaf litter were investigated over an 18-month period with reference to the role of fungal succession in the decomposition of lignin and holocellulose. Decomposition and fungal succession were studied in bleached and nonbleached portions of litter, which were precolonized by ligninolytic and cellulolytic fungi, respectively. Coccomyces nipponicum and Lophodermium sp. (Rhytismataceae), which can attack lignin selectively, caused mass loss of lignin and were responsible for bleaching during the first 4 months (stage I), whereas cellulolytic fungi caused mass loss of holocellulose in adjacent nonbleached portions. Soluble carbohydrates and polyphenols also decreased rapidly during this stage. Pestalotiopsis guepini, coelomycete sp.1, and the Nigrospora state of Khuskia oryzae caused mass loss of holocellulose between 4 and 14 months (stage II) and Xylaria sp. caused mass loss of both lignin and holocellulose from 14–18 months (stage III). In stages II and III, decomposition was more rapid in bleached portions than in nonbleached portions probably due to the prior delignification of lignified holocellulose in bleached portions. Frequencies of these fungi showed different responses among species to the pattern of changes in lignin and holocellulose contents during decomposition. Total hyphal length increased in both portions over the study period, but mycelia of basidiomycetes accounted for about 2% of total hyphal length, suggesting that their role in fungal succession and decomposition was low. Lignin and nitrogen contents were consistently lower and holocellulose content was higher in bleached portions than in nonbleached portions during decomposition. The succession of ligninolytic and cellulolytic fungi was a major driving factor that promoted decomposition and precolonization by ligninolytic fungi enhanced decomposition.
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Acknowledgements
We thank Dr. S. Tokumasu, Dr. S. Iwamoto, and Dr. T. Hosoya for their helpful identification of fungi; Dr. A. Mori for his help in statistical analysis; Mr. Y. Fukasawa, Mr. D. Hirose, Mr. S. Katsumata, and members of Laboratory of Forest Ecology, Kyoto University, for their valuable discussion. This study received partial financial support from the Japanese Ministry of Education, Culture and Sports (No. 14760099) to T.O.
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Koide, K., Osono, T. & Takeda, H. Fungal succession and decomposition of Camellia japonica leaf litter. Ecol Res 20, 599–609 (2005). https://doi.org/10.1007/s11284-005-0077-2
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DOI: https://doi.org/10.1007/s11284-005-0077-2