| Popis: |
The objective of the present work was to study, during a year, the microbial community structure of a soil under different vegetations (shrubland and pinewood), after a high intensity wildfire, by mean of the analysis of phospholipid fatty acid (PLFA) and compared with the respective unburnt control. Measurements were made immediately and 3, 6 and 12 months after the fire. The principal component analysis performed with the PLFA data separated clearly soil samples of shrubland from the pinewood and the burnt samples from the corresponding unburnt control. The pinewood samples were characterized by high concentrations of fatty acids characteristics of bacteria while the shrubland samples were characterized by high concentrations of fatty acid characteristic of bacteria, actinobacteria and fungi. On the other hand, the burnt samples had high concentrations of fatty acids characteristic of bacteria and actinobacteria, while the unburnt samples had high concentrations of fatty acids characteristic of fungi and gram negative bacteria. The fire caused an increment of the actinobacteria and a decrease of the fungi and gram negative bacteria. The main factor that determined the structure of the microbial community was the difference in the type of vegetation (shrubland or pine), while the passage of fire, but also affected the microbial diversity, had a less significant effect. These microbial changes persisted even one year after the wildfire |
