| Budget Amount *help |
¥2,500,000 (Direct Cost: ¥2,500,000)
Fiscal Year 1990: ¥100,000 (Direct Cost: ¥100,000)
Fiscal Year 1989: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1988: ¥1,700,000 (Direct Cost: ¥1,700,000)
|
|---|
| Research Abstract |
As a step to elucidate the mechanism of expression of potential forest-soil microbes, the following censuses and experiments were carried out.
The biomasses of soil organisms, namely fungi, bacteria, crystal violet-resistant bacteria, cellular slime molds, oribatid mites, nematodes, and enchytraid worms decreased immediately after the application of urea(800 g/m^2) to the forest soil. The biomasses of bacteria, crystal violet-resistant bacteria, and slime molds in urea-treated soil showed higher values than those in nonurea-treated soil (=control) at about the same time as the occurrence of the early succession of ammonia fungi, while, those of oribatid mites and soil Arthropleona showed higher values than those in the control throughout the period of the occurrence of the ammonia fungi.
Amblyosporium botrytis grew vigorously under neutral to alkaline conditions at both high concentration of NH_4-N and high water content. Asobolus denudatus grew vigorously under neutral to alkaline conditions. Coprinus phlyctidosporus grew vigorously at a high concentration of NH_4-N. Lyophyllum tylicolor and Hebeloma vinosophyllum showed tolerance to a high concentration of NH_4-N.
These and the results obtained from the correlation analyses among the degree of the occurrence of the ammonia fungi, biomasses of other soil organisms and the condition of the soil suggest that the ammonia fungi are a kind of the groups of the potential forest-soil microbes, which begin to propagate at the ecological gap, namely the condition under the decrease of biomasses of soil organisms caused by a high concentration of NH_4-N at an alkakaline condition, and then grow vigorously in these soil because of their adaptation to these environments.
|
