| Author(s): |
Mariana Cruz Rodrigues de Campos
Total Authors: 1
|
| Document type: | Master's Dissertation |
| Press: | Campinas, SP. , ilustrações. |
| Institution: | Universidade Estadual de Campinas (UNICAMP). Instituto de Biologia |
| Defense date: | 2008-01-29 |
| Examining board members: |
Carlos Alfredo Joly;
Marco Antonio de Assis;
Luis Carlos Bernacci
|
| Advisor: | Carlos Alfredo Joly |
| Field of knowledge: | Biological Sciences - Ecology |
| Indexed in: | Base Acervus-UNICAMP; Biblioteca Digital da UNICAMP |
| Location: | Universidade Estadual de Campinas. Biblioteca Central Cesar Lattes; T/UNICAMP; C157r; Universidade Estadual de Campinas. Biblioteca do Instituto de Biologia; T/UNICAMP; C157r |
| Abstract | |
In a 1-ha plot divided into 100 subplots of 10 x 10 m, all trees with at least 15 cm of perimeter at breast height (DBH = 4.8 cm) were marked and had their heights estimated and perimeter taken. The rock cover (rocks over 50 cm diameter) was estimated in fie classes of frequency, and records were made for individuals growing directly on rocks. The concentration of soil chemical elements was analysed for 16 subplots and the results were interpolated by gridding methods for the other subplots. The relations between the composition and structure of a patch of Atlantic Ombrofilous Dense Forest and the microtopographical and edaphic variables were analyzes through Canonical Correspondence Analysis (CCA), a multivariate ordination analysis. 1274 trees in the sampling criteria were found, belonging to 41 botanical families (highlighting Myrtaceae, Rubiaceae and Fabaceae) and 142 species or morphotypes. The most important (Importance Value Index) species are: Euterpe edulis, Mollinedia schottiana, Bathysa mendoncaei, Coussarea accedens, Rustia formosa and Guapira opposita. Shannon¿s diversity index was 4.05nats/ind and Pielou¿s equability was 0.82. The average tree height is of nine m and the canopy is at around 18 m. The trees¿ average diameter is 13.9 cm, and 29 individuals surpass 50 cm DBH. The basal area for the 1-ha plot (live trees only) is 30.27m2. A direct relation was found between rock cover and lesser species richness and stem number per subplot. No relation was found in regard to rocks and average height and DBH. 34 tree species in this area are able to grow on rocks; 11 of which don¿t grow roots to the soil, particularly Euterpe edulis and Guapira opposita. The height and diameter of the individuals that grow on rocks is not statistically different from the remaining in the plot. The CCA for the community suggests that the environmental factors that influence phytosociological parameters the most are the amount of rocks and the slope. The second CCA (performed with species with 10 or more individuals) does not have high inertia values, and there is also at least 20% probability t hat the results could be obtained by chance. However, the variables shown as of major importance for the vectors (surfaced water and rocks, Al and O concentration and pH) are consistent with other studies in tropical rainforests (AU) | |
| FAPESP's process: | 06/52519-6 - Floristics and structure of the arboreal community of the submountainous dense evergreen Rainforest in the Nucleus Picinguaga - PESM, Ubatuba, SP |
| Grantee: | Mariana Cruz Rodrigues de Campos |
| Support Opportunities: | Scholarships in Brazil - Master |