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Dendrophysiological plant strategies of Poincianella pyramidalis L.P. Queiroz depois da herbivoria no tronco em regioes semiaridas na Paraiba--Brasil
The increase in Equus africanus asinus Linnaeus population in semiarid areas of Northeast Brazil had significant impacts on wild and rural areas. The objective of this work was to analyze the herbivory of E. africanus asinus on Poincianella pyramidalis (Tul). L.P. Queiroz and determine the dendrophy...
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Published in: | Acta scientiarum. Biological sciences 2016-04, Vol.38 (2), p.179 |
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Main Authors: | , |
Format: | Article |
Language: | Spanish |
Online Access: | Get full text |
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Summary: | The increase in Equus africanus asinus Linnaeus population in semiarid areas of Northeast Brazil had significant impacts on wild and rural areas. The objective of this work was to analyze the herbivory of E. africanus asinus on Poincianella pyramidalis (Tul). L.P. Queiroz and determine the dendrophysiological strategies P. pyramidalis used during and after damage caused by E. africanus asinus. The selected areas have significant populations of P. pyramidalis with amplified importance value higher than 50%. Two areas were established: one control and another experimental, with presence of E. africanus asinus. The study was carried out from 2001 to 2015. The evaluated variables of P. pyramidalis were: sap flow, basic density, diameter, volume, biomass and leaf area index. The increase of abandoned E. africanus asinus in semiarid areas resulted in impact and responses from P. pyramidalis. This plant species compensates for biomass losses and physiological activities reduction with two strategies: i) increase in the belowground biomass stock, and ii) increase in sap flow in undisturbed branches. Keywords: ecological interactions, ecophysiology, survival strategies. O aumento da populacao de Equus africanus asinus Linnaeus em areas do Semiarido do Nordeste brasileiro teve um impacto significativo sobre as areas silvestres e rurais. O objetivo desse trabalho foi analisar a herbivoria de E. africanus asinus sobre a especie vegetal Poincianella pyramidalis (Tul). L.P. Queiroz e quais as estrategias dendrofisiologicas que essa especie (P. pyramidalis) utilizou no momento e depois do dano causado pelo E. africanus asinus. As areas selecionadas possuem significante presenca populacional de P. pyramidalis, com valor de importancia ampliada maior do que 50%. Duas areas foram estabelecidas: uma controle e outra experimental com a presenca de E. africanus asinus. O estudo foi realizado de 2001 a 2015. As variaveis avaliadas de P. pyramidalis foram: fluxo da seiva, densidade basica, diametro, volume, biomassa e indice de area foliar. O aumento da populacao de E. africanus asinus abandonados em areas do Semiarido resultou em impacto e respostas na especie P. pyramidalis. Essa especie vegetal compensou suas perdas dendrometricas e reducao nas atividades fisiologicas com duas estrategias: i) aumento no estoque de biomassa abaixo da superficie do solo; e ii) aumento do fluxo de seiva nos ramos nao impactados. Palavras-chave: interacoes ecologicas, ecofisiologia, estrategias d |
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ISSN: | 1679-9283 |
DOI: | 10.4025/actascibiolsci.v38i2.29089 |