Full text
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| Author(s): |
Welington Luis Sachetti Júnior
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | Campinas, SP. |
| Institution: | Universidade Estadual de Campinas (UNICAMP). Instituto de Biologia |
| Defense date: | 2021-08-02 |
| Examining board members: |
Peter Stoltenborg Groenendyk;
Giuliano Maselli Locosselli;
Fábio Pinheiro
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| Advisor: | Peter Stoltenborg Groenendyk |
| Abstract | |
The dynamics of carbon stocks in different forest physiognomies is influenced by the architecture, growth rates and population structure of the tree species present in them. Climate and soil are considered the main factors influencing the differences between physiognomies, but few studies analyze soils as a factor in tree growth, being mainly focused on the effects of climate. Quantifying how soil affects vegetation characteristics is important to understand the dynamics and biomass stock of these systems. Here we study how population structure, tree architecture and growth rates vary for the same species growing in contrasting physiognomies, but with similar levels of annual precipitation, and we also assess which edaphoclimatic factors may be related to these differences. From this, we tried to answer the following questions: 1) How does the age, diameter and height structure vary between two populations of Jatobá growing in different physiognomies? 2) Is there a variation in the growth rate of trees between the two physiognomies? 3) Can edaphic variables be related to differences in growth in H. courbaril between physiognomies? The hypotheses are: 1) In the Tropical Seasonal Evergreen Forest (TSEF) individuals will have greater diameter and height than in the Cerrado due to lower water stress, having a stronger relationship between diameter and height (greater height gain per gain in diameter), reflecting the greater competition for light in this physiognomy; 2) The growth rate in diameter will be lower in individuals belonging to the Cerrado due to water stress generated by seasonality and the sandy soil of this physiognomy; 3) As it is a similar climate between the two locations (similar mean annual precipitation), it is expected that the soil variables are associated with differences in the growth of H. courbaril in each physiognomy, with the growth rate being higher in more soils fertile and with smaller granulometry. To test the hypotheses, data on diameter, height, population and age structure were collected from two populations of Jatobá (Hymenaea courbaril) from a humid forest (4 plots in Ceará) and a Cerrado (in 3 plots of ~1 hectare, in Piauí). We obtained the ages and growth rates by analyzing the growth rings and collected soil samples from all plots for physicochemical analyses. From this study, we found differences in growth rates in the juvenile phase (~12 cm and ~50 years) between the populations of the TSEF and Cerrado, this rate being higher in individuals from the Cerrado; The Humid Forest has the largest individuals both in height and diameter, in addition to being older than in the Cerrado; There was no influence from chemical aspects of the soil on the growth of H. courbaril for any location; Physical aspects, on the other hand, may be associated with a higher growth rate in juvenile individuals (0-4 cm), with the highest rate in the Cerrado (AU) | |
| FAPESP's process: | 19/21579-3 - Effects of climate variation on growth and hydraulic functioning of jatobá xylem (Hymenaea courbaril - Fabaceae) in two contrasting phytophysiognomies: rainforest and Cerrado |
| Grantee: | Welington Luis Sachetti Júnior |
| Support Opportunities: | Scholarships in Brazil - Master |