1. Cambios en el banco de semillas por la invasión de Baccharis dracunculifolia y Racosperma melanoxylon en ambientes serranos del Sistema de Tandilia, Buenos Aires.
- Author
-
VIGNOLIO, OSVALDO R., ISPIZZÚA, VERÓNICA N., ANGELINI, HERNÁN P., and DE LAS M. ECHEVERRİA, MARİA
- Subjects
- *
SOIL seed banks , *NATIVE species , *GRASSLAND conservation , *OLD growth forests , *PLANT invasions , *PLANT gene banks , *GRASSLAND restoration - Abstract
The analysis of the effects of plant invasion on plant community structure and the planning native species restoration must include the seed bank studies. This study analyzed the effects of the propagation of Baccharis dracunculifolia shrub (Bd) and Racosperma melanoxylon trees (young and old acacia forests) on the soil seed bank (SB) and litter seed bank (LB) in a grassland dominated by Paspalum quadrifarium (Pq) within a natural reserve in the Tandilia mountain system. We present results on seedling density, richness, diversity, equitability and the floristic dissimilarity (IDF). Baccharis dracunculifolia y P. quadrifarium have transient seed bank, while R. melanoxylon has a persistent one. A total of 94 species were recorded in the soil seed bank, and 32 in the litter bank. Seed bank was higher in the acacias forests (14000 seeds/m2) than in Pq (8500 seeds/m2) and Bd (6400 seeds/m2). On the other hand, BB seed bank was higher in the grassland (965 seeds/m2) than in the forests (699 seeds/m2) and Bd (44 seeds/m2). The richness did not differ among P. quadrifarium grassland, grassland under B. dracunculifolia and acacias propagation, being, in average, 28 and 6 species in the soil and litter banks, respectively. Diversity and equitability differed with the type of seed bank and species propagation. Floristic dissimilarity analysis revealed that the environment dominated by P. quadrifarium and B. dracunculifolia shared more species in common compared to the grassland and the acacia forests. Grassland conservation efforts should consider the changes in seed banks induced by the propagation of B. dracunculifolia and R. melanoxylon. The low seed number and absence of P. quadrifarium in the old forest suggest that in addition to cutting the trees, further interventions are necessary for effective grassland restoration. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF