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Colonization and succession of fungi during decomposition of Swida controversa leaf litter

     Laboratory of Forest Ecology, Graduate School of Agriculture, Kyoto University, Kyoto 606-8502 Japan

Decomposition processes of Swida controversa leaves were investigated in initially sterilized (fungi-excluded) and nonsterilized freshly fallen leaves to examine the relationship between chemical changes and fungal succession during decomposition and the effect of exclusion of previously established phyllosphere fungi from leaves on subsequent decomposition and fungal succession. Fifteen species were isolated frequently from decomposing leaves with surface-disinfection and washing methods. These fungi were divided into early and late colonizers according to their occurrence during decomposition. The 1.5 y decomposition process was divided into three stages characterized by different dominant organic chemical constituents. A clear relationship was demonstrated between chemical changes and fungal succession. Total hyphal length and frequencies of some early colonizers were reduced in initially sterilized leaves at 3 wk, but this had no significant effect on loss of litter mass or chemical changes during the first 3 wk or on the subsequent decomposition and fungal succession.

Key words: dogwood, hyphal length, lignin, litter bag, phyllosphere

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