Canopy openness and soil conditions explain community structure and diversity in a tropical seasonal forest in south-eastern Brazil
| Autor: | Tiago Egydio Barreto, Natália Macedo Ivanauskas, Renato Augusto Ferreira de Lima, Maria Teresa Zugliani Toniato, Flaviana Maluf Souza, Ricardo Ribeiro Rodrigues |
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| Rok vydání: | 2021 |
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| Zdroj: | Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP Acta Botânica Brasílica, Vol 35, Iss 4, Pp 638-652 (2022) Acta Botanica Brasilica, Volume: 35, Issue: 4, Pages: 638-652, Published: 04 FEB 2022 Acta Botanica Brasilica v.35 n.4 2021 Acta Botanica Brasilica Sociedade Botânica do Brasil (SBB) instacron:SBB |
| Popis: | In tropical semi-deciduous forests, where 20-50 % of canopy trees shed their leaves in the dry season, species with varying degrees of leaf deciduousness share the same space and resources. Here, we describe the tree community in a 10.24-ha plot to assess whether small-scale variation in canopy structure and soil conditions are associated with changes in tree community structure, diversity, and composition. We sampled 11,585 individuals with diameter at breast height ≥ 4.8 cm belonging to 146 species. Plot density (1,129 trees ha-1) and basal area (24.81 m2 ha-1) were smaller than other similar forests, which may be due to an old wind disturbance. For 8.96 ha, we evaluated the relationship between abiotic factors and community descriptors using regression models. Results varied within size classes, but canopy openness was associated with changes in the community structure and diversity, and soil fertility did not affect species diversity. Tree density, basal area, and diversity were smaller in areas with more canopy gaps. Tree density and basal area increase with phosphorus availability, while the density of deciduous trees increased with canopy openness and base saturation. Thus, we found evidence that canopy openness and soil can explain small-scale variations of forest structure and diversity. |
| Databáze: | OpenAIRE |
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