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EFFECT OF FIRE ON FLOWERING AND FRUITING OF ANACARDIUM HUMILE (ANACARDIACEAE) IN CERRADO STRICTO SENSU Translated title: EFEITO DO FOGO NA FLORAÇÃO E FRUTIFICAÇÃO DE ANACARDIUM HUMILE (ANACARDIACEAE) EM CERRADO STRICTO SENSU

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      Abstract

      ABSTRACT Knowledge about the effects of fire on sexual reproduction of Cerrado woody species is fundamental for elaborating public policies and management plans for its conservation. The present study evaluated the effect of a controlled burning on flowering and fruiting of Anacardium humile in an Cerrado stricto sensu environment, in Cavalcante, GO. An area with no fire records for five years was submitted to controlled burning in May 2016, used as the experimental area and its adjacent areas protected from fire as control area. In each area, 16 reproductive individuals were selected and their production of floral buds, flowers and fruits, followed up for 17 months. In 2016 the production of reproductive structures was higher in the control area, since the majority of individuals of the burned area invested in the recovery of vegetative structures (branches) damaged by fire. Only three individuals flowered in the burned area in 2016 and presented greater effort in the production of buds and flowers per panicle than the individuals in the control area, however, the fruit set was equal between the areas. One year after fire, the production of reproductive structures became equal between areas. The control area presented higher fruit production in 2017 in comparison to 2016, indicating a variable pattern in annual fruit production. The impact of fire on the reproductive structures of A. humile is greater in the same year of fire and its reproductive potential can be normalized in the subsequent year.

      Translated abstract

      RESUMO O conhecimento acerca dos efeitos do fogo na reprodução sexual das espécies lenhosas do Cerrado é fundamental para a elaboração de políticas públicas e de ferramentas de manejo para a sua conservação. O presente estudo avaliou o efeito de uma queima controlada na floração e frutificação de Anacardium humile em ambiente de cerrado sentido restrito, em Cavalcante, GO. Uma área sem registro de fogo há cinco anos foi submetida a queima controlada em maio de 2016 e utilizada como área experimental e suas adjacências protegidas do fogo como áreas controle. Em cada área, 16 indivíduos reprodutivos foram selecionados e sua produção de botões florais, flores e frutos, acompanhada por 17 meses. Em 2016 a produção de estruturas reprodutivas foi maior na área controle, uma vez que a maioria dos indivíduos da área queimada investiu na recuperação das estruturas vegetativas (ramos) danificadas pelo fogo. Apenas três indivíduos floresceram na área queimada em 2016 e apresentaram maior esforço na produção de botões e flores por panícula do que os da área controle, todavia, a taxa de frutificação foi igual entre as áreas. Um ano após a queima a produção das estruturas reprodutivas tornou-se igual entre as áreas. A área controle apresentou maior produção de frutos em 2017 comparada a 2016, indicando padrão variável na produção anual de frutos. O impacto do fogo nas estruturas reprodutivas de A. humile é maior no mesmo ano de queima e seu potencial reprodutivo pode ser normalizado no ano posterior.

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      Most cited references 43

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      Post-burn reproduction of woody plants in a neotropical savanna: the relative importance of sexual and vegetative reproduction

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        MULTIPLE DISTURBANCE INTERACTIONS AND DROUGHT INFLUENCE FIRE SEVERITY IN ROCKY MOUNTAIN SUBALPINE FORESTS

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          Pollen coupling of forest trees: forming synchronized and periodic reproduction out of chaos.

           Y. Iwasa,  A Satake (2000)
          Many of the tree species in mature forests show masting; their reproductive activity has a large variance between years and is often synchronized between different individuals. In this paper, we analyse a globally coupled map model in which trees accumulate photosynthate every year, produce flowers when the energy reserve level exceeds a threshold, and set seeds and fruits at a rate limited by pollen availability. Without pollen limitation, the trees in the forest show independent chaotic fluctuation. Coupling of trees via pollen exchange results in reproduction being synchronized partially or completely over the forest. The whole forest shows diverse dynamical behaviors determined by the values of two essential parameters; the depletion coefficient k and the coupling strength beta. We find perfectly synchronized periodic reproduction, synchronized reproduction with a chaotic time series, clustering phenomena, and chaotic reproduction of trees without synchronization over individuals. There are many parameter windows in which synchronized reproduction of trees shows a stable periodic fluctuation. For perfectly synchronized forests, we can calculate all the Lyapunov exponents analytically. They show that synchronized reproduction of all the trees in the forest can only occur when trees flower at low (but positive) levels in a significant fraction of years, resulting in small fruit sets due to outcrossed pollen limitation. This is consistent with the observation that the distinction between mast years and non-mast years is often not clear cut. Copyright 2000 Academic Press.
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            Author and article information

            Affiliations
            Anápolis Goiás orgnameUniversidade Estadual de Goiás orgdiv1Unidade Universitária Brazil cunhahf@ 123456gmail.com
            Goiânia GO orgnameInstituto Brasileiro de Meio Ambiente e dos Recursos Naturais Renováveis Brasil diegoagro97@ 123456hotmail.com
            Contributors
            Role: ND
            Role: ND
            Journal
            rarv
            Revista Árvore
            Rev. Árvore
            Sociedade de Investigações Florestais (Viçosa, MG, Brazil )
            0100-6762
            1806-9088
            February 2019
            : 42
            : 6
            S0100-67622018000600204 10.1590/1806-90882018000600005

            This work is licensed under a Creative Commons Attribution 4.0 International License.

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            Figures: 0, Tables: 0, Equations: 0, References: 56, Pages: 0
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            Product Information: SciELO Brazil
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