Long-term post-fire resprouting dynamics and reproduction of woody species in a Brazilian savanna |
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| Affiliation: | 1. Universidade de Brasília, Programa de Pós-Graduação em Ecologia, Brasília, DF 70919-900, Brazil;2. Universidade do Estado de Mato Grosso, Programa de Pós-Graduação em Ecologia e Conservação, Nova Xavantina, MT 78.690-000, Brazil;3. Universidade de Brasília, Programa de Pós-Graduação em Ciências Florestais, Brasília, DF 70910-900, Brazil;4. Instituto de Pesquisa Ambiental da Amazônia, Canarana, MT 78640-000, Brazil;5. Departamento de Biologia de Plantas, Instituto de Biologia, Universidade de Campinas, Campinas, SP 13083–970, Brazil;6. Universidade Federal Rural da Amazônia, Capitão Poço, PA 68650-000, Brazil;1. Programa de Pós-Graduação em Ecologia e Evolução, Universidade Federal de Goiás, CP 131, Goiânia, GO, CEP 74001-970, Brazil;2. Instituto de Pesquisa Ambiental da Amazônia (IPAM), Brasília, DF, Asa Norte CLN 211 B1 B Sala 201 - Asa Norte, CEP 70863-520, Brazil;3. Instituto de Biologia, University of Campinas (UNICAMP), Campinas, SP 13083-970, Brazil;4. Departamento de Ecologia, IB, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves 9500, Porto Alegre, RS, CEP 91501-970, Brazil;5. Departamento de Ecologia, ICB, Universidade Federal de Goiás, CP 131, Goiânia, GO, CEP 74001-970, Brazil;1. Programa de Pós-graduação em Ecologia e Conservação, Universidade do Estado de Mato Grosso (UNEMAT), P.O. Box 08, 78690-000, Nova Xavantina, MT, Brazil;2. Universidade Federal de Rondonópolis, Instituto de Ciências Exatas e Naturais (ICEN) Avenida dos Estudantes, 5055 Cidade Universitária, 78736900 Rondonópolis, MT Brazil;3. Departamento de Engenharia Florestal, Universidade de Brasília, 70910-900, Brasília, DF, Brazil;4. Faculdade de Ciências Biológicas, Universidade Federal do Pará, Rua Coronel José Porfírio nº 2514, São Sebastião, 68372-040, Altamira, PA, Brazil;5. Instituto de Pesquisa Ambiental da Amazônia (IPAM), Rua Horizontina 104, 78640-000, Canarana, MT, Brazil;6. Curso de Ciências Biológicas, Universidade do Estado de Mato Grosso (UNEMAT), P.O. Box 08, 78690-000, Nova Xavantina, MT, Brazil |
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| Abstract: | Resprouting is an efficient life history strategy by which woody savanna species can recover their aboveground biomass after fire. However, resprouting dynamics after fire and the time it takes to start producing flowers and fruits are still poorly understood, especially for the Brazilian savanna (Cerrado biome), where fire is an important driver of vegetation structure and ecosystem functioning. We investigated the resprouting dynamics and production of flowers and fruits of 26 woody species (20 tree and 6 shrub species for a total of 485 individuals) that were burned and the production of flowers and fruits for a subset of 12 species (139 individuals) in an unburned area in a Brazilian savanna. We classified the species’ resprouting strategies as hypogeal (at the soil level, with main stem death), epigeal (on the main stem or crown), and hypogeal + epigeal. We used generalized linear mixed-effect models to identify the post-fire recovery patterns for five years. Individuals with basal resprouts (hypogeal and hypogeal + epigeal resprouting) produced an average of 6 basal resprouts, but only 33% of resprouts survived after five years. Individuals in burned areas produced fewer flowers and fruits than individuals in unburned areas. At least a subset of individuals in all the resprouting strategies started to produce flowers and fruits in the first-year post-fire. About 68% of the species with hypogeal resprouts produced flowers and fruits in the first-year post-fire, but the intensity of flowering and fruiting was lower compared to individuals with other resprouting strategies over time. Although woody species have invested in post-fire growth and sexual reproduction in all resprouting strategies, the long time needed to recover these processes can make these species more vulnerable to frequent fires. |
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