bachelor thesis
Caracterización del banco de semillas germinable en áreas de bosque secundario y pastizales de piedemonte llanero, campus Loma Linda, universidad Santo Tomás -Villavicencio
Fecha
2017Registro en:
Domínguez Guarín, K., & Romero Perdomo, Y. (2017). Caracterización del banco de semillas germinable en áreas de bosque secundario y pastizales de piedemonte llanero, campus Loma Linda, universidad Santo Tomás -Villavicencio. Villavicencio, Meta, Colombia: Facultad de Ingeniería Ambiental, Universidad Santo Tomás.
reponame:Repositorio Institucional Universidad Santo Tomás
instname:Universidad Santo Tomás
Autor
Domínguez Guarín, Kelli Johana
Romero Perdomo, Yeraldin
Institución
Resumen
Germinable seed bank (BSG) was characterized and compared in the area of Piedmont llanero, in two (2) vegetation types (secondary forest and pasture) on grounds of Santo Tomas University, Loma Linda campus - Villavicencio. In every vegetation type were taken 60 samples of soil (2.100 cm3 each one) to examine the composition and diversity of the BSG. Soil samples were extracted at depths of 0-5 cm and 5- 10cm. The samples were deposited in trays (1 cm of soil sampled on 2 cm of substrate of river sand) and placed under greenhouse conditions. The germinated seedlings of each morphospecies were counted every 15 days during 4 months and later classified at species level, habit of growth and dispersion strategy. Density, richness and diversity (alpha and beta) and composition of the BSG were determined. The BSG was compared in each coverage using the Kruskal-Wallis test (non-parametric ANOVA). In order to establish the relationship between the BSG diversity and the physicochemical characteristics of the soil and the terrain slope, the Spearman Rank Correlation Coefficient was applied. According to the results obtained, no significant differences were found between the BSG of the two types of vegetation. A total of 4.057 individuals belonging to 16 families, 26 genera and 34 species were counted. The highest abundance was recorded in pasture areas with 2.288 individuals, followed by forest with 1.769 individuals. In spite of the presence of some exclusive species of each vegetation type, no significant differences in the composition and diversity of the BSG were found. The dominant dispersion in both types of vegetation was defined by the same specie (Lindernia crustacea, a hydro-grass plant). Ecological succession in the areas of pasture and secondary forest of the Loma Linda campus can be classified as low to intermediate. It seems that the dispersion from the forest fragments and the vegetation of neighboring pastures is not very high and is limited mainly to the presence of herbaceous species; so, the entrance of soil-seeds of arboreal and shrub species in pasture areas is relatively scarce . It is discussed the effect of the disturbance conditions of the area and the type of dispersion of the plants on the composition and diversity of the BSG.