アカマツ林土壌における糸状菌の分布に関する研究(第5報) : 1林分内の糸状菌の水平分布

Little attention has been paid to the horizontal distribution of micro-fungi in a forest stand.
To know such distribution, eighteen samples were collected from F layer of or ganic horizon in a pine（Pinus densiflora）stand. Each sample was a composite of ten subsamples. The isolation of micro-fungi was done by the dilution plate method.
Fungal counts ranged from 118×<10>^4 to 321×<10>^4 among the samples, but these counts did not correlated to the differences of the vegetation and micro relief between each plot(Table 1, 2).
Each species had as much deviation in its count.
The frequency distributions of fungal counts of several species are shown in Fig.
1.These figures might be skewed to the left.
Only five species of thirty-eight species or groups identified were isolated from all eighteen samples. Many other species were isolated from fewer samples(Table 3).
The close correlation was found between frequency of isolation of a species and its maximum count(Fig. 2).
On the basis of these informations, number of fungi, frequency of isolation, number of species and dominant species as the measures of analysis of fungal population were discussed.