Importância da diversidade para a magnitude e estabilidade do aporte de detritos em uma floresta sazonal
Biodiversity has been identified as one of the main factors driving the increase of ecosystem productivity, as well as positively influencing the stability of the communities and negatively in the stability of the population that compose them, In this work, we tested the importance of biodiversity,...
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| Formato: | bachelorThesis |
| Idioma: | pt_BR |
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Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/47303 |
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| Resumo: | Biodiversity has been identified as one of the main factors driving the increase of ecosystem productivity, as well as positively influencing the stability of the communities and negatively in the stability of the population that compose them, In this work, we tested the importance of biodiversity, represented by taxonomic richness and phylogenetic diversity, for the magnitude and stability of plant litter in population and community scale in a forest fragment of Restinga in Rio Grande do Norte. Ten collections were carried out from January to October 2016 in 41 25 m² plots. Phylogenetic diversity was measured by using the Faith’s PD modified in a phylogenetic tree constructed with “S.PhyloMaker” function in RStudio, for all 41 species used in this study. Taxonomic richness and phylogenetic diversity of the plots were calculated based on the amount of litter collected, and not on the living vegetation of the plots. For statistical analyzes, we used simple regressions and Akaike model selection criteria (AIC), using the diversity variables already mentioned, besides the canopy opening of the plots, total population basal area, and abiotic edaphic variables of the plots (nitrogen and phosphorus concentrations). Both parameter of diversity had little influence, both in the magnitude and the stability of litterfall at community level, but taxonomic richness had weakly negative effect in stability at population level. Variables of physical structure of the vegetation and concentration of nitrogen were the most important among the variables selected. The results obtained in this work, therefore, may indicate that, in fact, environments with high seasonality, such as Restingas are, make little use of niche complementarity mechanisms, which are the basis for most explanations of the Diversity-Productivity and Diversity-Stability. It is important to highlight that these are preliminary results of a long- term plant phenology project and the patterns of input dynamics tend to become clearer as increase the number of collections in the analysis. |
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