Abstract
The belowground biomass of two types of ecosystems, frequently burned open savannah (Campo Cerrado) and protected- from-fire closed savannah (Cerradao), was sampled every two months during a one year period, in three soil layers (0-12, 13-24, 25-36 cm). Living organs were separated by flotation and sieving. Belowground biomass showed significant seasonal variation, values being higher during the rainy season and lower during the dry period. Fire, and soil depth also had significant effects on belowground biomass. Biomass values were significantly higher in Cerradao for all months and in all soil layers. Belowground biomass was correlated significantly with climatic variables related to the water availability of the year sampled. Cerradao belowground biomass showed a hig- her correlation with climatic parameters than Campo Cerrado. The cerrados belowground biomass must be taken in consideration in the studies of fire effects, land use change and global carbon storage and release capacity. belowground biomass / Brazil / cerrado / fire / roots / tropical savannah
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