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ARTÍCULO
TITULO

Relationship between vegetation units and microtopography of a pasture located in a poorly drained sector of Argentina. Cien. Inv. Agr. (In English) 34(2):75-84.

B. Martín    
Oscar Sosa    
Sergio Montico    
Gabriel Zerpa    

Resumen

The spatial distribution of vegetable communities in depressed landscapes from Rolling Pampa (Pampa Ondulada), Argentina is frequently heterogeneous. The objective of this work was to study a possible relationship between topography and functional and structural characteristics of vegetation in a pasture located in a depressed and poorly drained area. The study was carried out in a sector next to a dell from the flowing Ludueña basin. The course of Ludueña extends between 32º 46´ and 33º 07´ S and 60º 39´and 61º 07´ W in the Santa Fe province of Argentina. The identification of the plant communities and a topographical study allowed us to recognize three highly productive forage units. In each unit, primary production, abundance and cover were determined. Plant units were established accordingly. The results obtained suggest that vegetation cover and vegetation abundance from depressed landscapes are highly related with microtopography.A menudo, las comunidades vegetales presentes en los paisajes deprimidos de la Pampa Ondulada son espacialmente heterogéneas. El objetivo de este trabajo fue establecer si existe relación entre las características estructurales y funcionales de la vegetación con la topografía, en un área mal drenada. El estudio se realizó en un sector próximo a una cañada perteneciente a la cuenca del arroyo Ludueña (Zavalla, Santa Fe, Argentina). El recorrido del arroyo Ludueña se ubica entre los 32º 46º y 33º 07´ de latitud sur y 60º 39´ y 61º 07´ de longitud oeste. La identificación de las comunidades vegetales y un relevamiento topográfi co permitieron reconocer tres unidades forrajeras de alta productividad (UFAP). En cada una se midió la productividad primaria neta aérea, la abundancia y el grado de cobertura, y se establecieron diversas unidades de vegetación. Los resultados sugieren que en los ambientes deprimidos la cobertura y la abundancia de la vegetación están altamente relacionadas con la microtopografía.

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