ARTÍCULO
TITULO

Relationship between the soil seed bank and vegetation of tall grassland of Spartina argentinensis. Cien. Inv. Agr. (In English) 34(1): 33-40.

S.R. Feldman    
Claudia Alzugaray    
Juan P. Lewis    

Resumen

Tall grass communities of Spartina argentinensis Parodi are the most widespread plant communities in a large saline depression in Santa Fe, Argentina. The vegetation and soil seed bank of these communities have been studied. However, there is no information about the relationship between them. We worked with previous data obtained from the Federico Wildermuth Reserve, Colonia Bel Grano, Departamento San Martín, Santa Fe, Argentina (31°57? S; 61°23? W) and used the cover-abundance of the plant species and density of the soil seed bank for 1998 and 1999. The relationship between plant types C3 and C4 (C3/C4) and annual/perennial functional groups were determined. At the same time, the similarity index and the relationship between coverabundance and density of the shared species was determined. According to results obtained, plant species of type C3 were more frequent in the soil seed bank, while plant species of type C4 were more abundant in the vegetation. There was no signifi cant correlation between coverabundance in the vegetation and soil seed bank density of the common species. The similarity index was very low due to the fact that the number of species common to vegetation and seed bank was very low. In conclusion, there was a low relationship between species of the soil seed bank and vegetation with plant species type C3 and C4 as predominant species, respectively. Los pajonales de Spartina argentinensis Parodi ocupan grandes extensiones en bajos salinos de la provincia de Santa Fe, Argentina. La vegetación y el banco de semillas del suelo de estas comunidades han sido analizados pero se desconoce la relación entre ambos compartimentos de la comunidad. Se trabajó con datos obtenidos previamente de la Reserva Federico Wildermuth Colonia Bel Grano, Departamento San Martín, Santa Fe, Argentina (31°57? S; 61°23? W). Con este propósito se empleó información sobre abundancia-cobertura de la comunidad aérea y densidad del banco, discriminada por especies, obtenidos durante 1998 y 1999. Se calcularon: proporciones de grupos funcionales de especies vegetales C3 y C4 y anuales/perennes, se determinó el índice de similitud y la relación entre abundancia-cobertura y densidad del banco de semillas, para las especies comunes. Las especies tipo C3 predominaron en el banco y las tipo C4 en la vegetación. Las especies comunes a ambos compartimentos no presentaron correlación entre la abundancia-cobertura del suelo y la densidad en el banco. El número de especies comunes fue muy bajo, por lo cual los índices de similitud fueron también bajos. En conclusión, los resultados obtenidos en este estudio demostraron la existencia de una escasa relación entre el banco de semillas del suelo y la vegetación en pie, en los cuales predominan plantas C3 y C4, respectivamente.

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