| Popis: |
The current microbiological and nutrient status of the humus layer of four forest site types, Myrtillus (MT), Oxalis-Myrtillus (OMT), Vaccinium (VT) and Calluna (CT) types in southern Finland were determined during two growing seasons. C/N ratio was highest, pH lowest on the poorest, CT, site. The nutrient content between sites differed clearly, year to year variation was normal. The physiological capacity of microorganisms was more complex in early summer than in the autumn in 1987. In 1988, the pattern was reversed except for the CT site. Seasonal variation in microbial and fungal amounts and activity was alike in both years. The weekly microbiological dynamics reflected the variation in humus moisture and temperature. This emphasizes the importance of sampling time and frequency in the future screening of the impact of acid atmospheric load, i.e. factors other than climatic, on the microbiological characteristics of the forest humus layer. |
