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Arquitetura de copas de árvores decíduas e sempre-verdes em cerrado sentido restrito no Distrito Federal
| Content Provider | Semantic Scholar |
|---|---|
| Author | Eduardo, Felipe Lima Lenti, Brandão |
| Copyright Year | 2014 |
| Abstract | Functional differences between Cerrado tree species with different vegetative phenology were investigated at both leaf and individual levels. Previous results in the literature indicate that leaf traits of deciduous trees are related to a less conservative nutrient use strategy, with higher values for maximum carbon assimilation rates (on a mass basis) and higher specific leaf area; and that crown architecture also diverge between deciduous and evergreen species. This study tests the hypothesis that evergreen species presents higher values for crown ratio (proportion of individual total height occupied by the crown) and foliage density (m2 of foliage per m3 of crown) in comparison to deciduous species. The influence exerted by crown architecture attributes on ecosystem properties is a function of the relative contribution of each group in terms of biomass. Hence, the hypothesis of equitable contribution of both groups to woody vegetation structure was tested. The study was conducted from june 2012 to december 2013 in the Brasilia National Park, where a module for long-term studies composed of two lines of 5 km separated by 1 km was installed. In order to evaluate possible relations between the distribution of deciduous trees and edaphic and topographic factors, environmental variables were characterized in the sampling plots (n=10). Intensity of the previous fire event and soil N content were significant variables to explain crown ratio but differences between phenological groups were not observed. However, evergreen species showed higher foliage density. Deciduous species prevail in the study site, corresponding to approx. 72% of total dry wood biomass. Within study plots, vegetation was classified in to three formations along a gradient of increasing tree cover: cerrado ralo – cerrado tipico – cerrado denso. In addition to this difference in tree cover, plots in the study area differed mainly with respect to their position in the terrain (distance to nearest riparian forest) and to the magnitude of internal variations in soil attributes. Deciduous species distribution showed a positive relation to higher values of soil pH, apparently due to shifts in soil characteristics in transitional areas between Cerrado and riparian forest. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://repositorio.unb.br/bitstream/10482/18094/1/2014_FelipeEduardoBrand%C3%A3oLenti.pdf |
| Alternate Webpage(s) | http://www.pgecl.unb.br/images/sampledata/arquivos/dissertacoes/2014/Felipe%20Eduardo%20Brando%20Lenti_reduzido.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
