Micro-organic colonization of forest soil after burning.

The results show that for some time, fire sites remain largely free of many of the micro-organisms that normally inhabit the soil and are then gradually colonized by species characteristic of burnt sites. Colonization was most pronounced at the margins due presumably to the invasion of the nutrient-rich soil of the fire site by mycellia from surrounding unburnt ground. The micro-organisms isolated from the centre of the burns during the early stages of succession, probably arise from spores brought in the wind and washed down by rain water. [ABSTRACT FROM AUTHOR]