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The seed bank is the main reserve of propagules available to a plant community for its maintenance, regeneration and perpetuation. Controlled burnings can produce changes in its composition and distribution. The objective of this work is to evaluate and compare the performance of germinable seed bank in a calden forest region before and after a controlled burning is produced. Five vegetation patches dominated by small grasses (fodder patches) were delimited as well as five patches dominated by medium size grasses (non fodder patches) and five patches dominated by shrubs (shrubby patches). At the same time, five soil samples per patch were taken by random sampling with a metallic cylinder, whose dimensions were 7 cm diameter and 4 cm height. Samples were divided into three subsamples: brushwood, 0-2 cm depth, and 2-4 cm. depth. Subsamples were placed on a sterilized seed bed in plastic trays and were periodically irrigated into a greenhouse. When seedlings emerged they were identified, counted, and extracted. Eight grass seedlings were identified for all depths. After the burning, Piptochaetium napostaense showed an increase in its ability of germination for 0-2 cm. depth in fodder and non fodder patches (P<0.05). Poa ligularis decreased its ability of germination in all vegetation patches (P<0.05). Non forage grasses showed different performances. Jarava ichu decreased its ability of germination in all vegetation patches, while Nassella tenuissima and N. trichotoma showed an increase in the ability of germination for 0-2 cm. depth in fodder patches. The use of controlled burnings produces different effects on grass seed bank depending on the temperature reached, the burial depth and species considered.

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Efecto de la quema controlada sobre el banco de semillas de gramíneas en diferentes parches del bosque de caldén en la región semiárida central Argentina