Composition of litter-decomposing fungal community under snow cover in a cool-temperate forest and their extracellular enzyme activity

研究了北海道部分林地在积雪条件下凋落物的分解、凋落物分解真菌群落的组成及其在低温下的胞外酶生产力。结果表明，在冬季积雪条件下，栎树和杉木枯枝落叶层在降雪后失去原有重量的同时，也出现了真菌出现或增多的现象。从橡树枯枝落叶中分离到的一些真菌能够延伸培养基上的菌丝，并在0℃时显示出木质素分解活性。这些结果表明，一些在0℃具有潜在降解木质素能力的凋落物分解真菌对雪盖下的凋落物分解有显著的贡献。

We investigated the decomposition of leaf litter and the composition of litter-decomposing fungal community under snow cover in some forest stands in Hokkaido, and their extracellular enzyme productivity at low temperature. It was observed that while the oak and fir foliage litter lost their original weight under snow during the winter season, some fungi appeared or increased the frequency. Some fungi isolated from oak litter were found to extend the mycelia on the media and indicated ligninolytic activity at 0℃. These results suggest that some litter-decomposing fungi, which have potential ability to degrade lignin at 0℃, significantly contribute the litter decomposition under snow cover.