Structural dynamics in a seasonally dry tropical forest under different silvicultural systems

ABSTRACT Considering the importance of evaluating the compatibility between the exploration system usually used in the Caatinga and the vegetation regeneration process, this study aimed to evaluate the feasibility of recovering structural parameters in an experimental unit subjected to different man...

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Veröffentlicht in:Caatinga 2024, Vol.37
Hauptverfasser: Lopes-Nunes, Ana L. da S., Holanda, Alan C. de, Costa, Malcon do P., Nunes, Lucas J., Silva, Maria K. A. G. da
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description ABSTRACT Considering the importance of evaluating the compatibility between the exploration system usually used in the Caatinga and the vegetation regeneration process, this study aimed to evaluate the feasibility of recovering structural parameters in an experimental unit subjected to different management systems aged 9, 12, 16, 20 and 26 years post-exploitation. The area was subjected to clearcutting (CC) regimes and three types of selective cuttings (SC1 – selective cutting 1, cut of trees with diameter at the base – DAB < 15 cm; SC2 – selective cutting 2, cut of trees with DAB > 10 cm; and SC3 – selective cutting 3, cut of trees with DAB between 5 and 10 cm). In permanent plots of 20 m × 20 m, individuals with a circumference at breast height (CBH) ≥ 6 cm and a total height greater than 1.0 m were measured. Over the years of monitoring, the CC presented the lowest values of density, dominance, and volume, not obtaining a recovery in basal area and volume even after 26 years of regeneration. Treatments SC2 and SC3 stood out regarding recovery of the original woody biomass stock, presenting values higher than the original ones and indicating that the initial data did not correspond to the site's maximum potential. The forest dynamics pointed to the insufficiency of the 15-year clearcutting cycle in terms of recovering this region forest composition and structure. RESUMO Considerando a importância de se avaliar a compatibilidade entre o sistema de exploração usualmente empregado na Caatinga e o processo de regeneração da vegetação, este estudo objetivou avaliar a viabilidade de recuperação dos parâmetros estruturais em uma unidade experimental submetida a diferentes sistemas de manejo com idades de 9, 12, 16, 20 e 26 anos pós-exploração. A área foi submetida aos regimes de corte raso (CR) e três tipos de cortes seletivos (SC1 – corte seletivo 1, de árvores com diâmetro na base – DNB < 15 cm; SC2 – corte seletivo 2, de DNB > 10 cm; e SC3 – corte seletivo 2, de DNB entre 5 e 10 cm). Em parcelas permanentes de 20 m × 20 m, foram mensurados os indivíduos com CAP ≥ 6 cm e altura total superior a 1,0 m. Ao longo dos anos de monitoramento, o CR apresentou os menores valores de densidade, dominância e volume, não obtendo recuperação em área basal e volume mesmo após 26 anos de regeneração. Os tratamentos SC2 e SC3 se sobressaíram quanto à recuperação do estoque original de biomassa lenhosa, apresentando valores superiores aos originais e indicando que os dados in
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In permanent plots of 20 m × 20 m, individuals with a circumference at breast height (CBH) ≥ 6 cm and a total height greater than 1.0 m were measured. Over the years of monitoring, the CC presented the lowest values of density, dominance, and volume, not obtaining a recovery in basal area and volume even after 26 years of regeneration. Treatments SC2 and SC3 stood out regarding recovery of the original woody biomass stock, presenting values higher than the original ones and indicating that the initial data did not correspond to the site's maximum potential. The forest dynamics pointed to the insufficiency of the 15-year clearcutting cycle in terms of recovering this region forest composition and structure. RESUMO Considerando a importância de se avaliar a compatibilidade entre o sistema de exploração usualmente empregado na Caatinga e o processo de regeneração da vegetação, este estudo objetivou avaliar a viabilidade de recuperação dos parâmetros estruturais em uma unidade experimental submetida a diferentes sistemas de manejo com idades de 9, 12, 16, 20 e 26 anos pós-exploração. A área foi submetida aos regimes de corte raso (CR) e três tipos de cortes seletivos (SC1 – corte seletivo 1, de árvores com diâmetro na base – DNB &lt; 15 cm; SC2 – corte seletivo 2, de DNB &gt; 10 cm; e SC3 – corte seletivo 2, de DNB entre 5 e 10 cm). Em parcelas permanentes de 20 m × 20 m, foram mensurados os indivíduos com CAP ≥ 6 cm e altura total superior a 1,0 m. Ao longo dos anos de monitoramento, o CR apresentou os menores valores de densidade, dominância e volume, não obtendo recuperação em área basal e volume mesmo após 26 anos de regeneração. Os tratamentos SC2 e SC3 se sobressaíram quanto à recuperação do estoque original de biomassa lenhosa, apresentando valores superiores aos originais e indicando que os dados iniciais não correspondiam ao potencial máximo do sítio. 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A. G. da</creatorcontrib><title>Structural dynamics in a seasonally dry tropical forest under different silvicultural systems</title><title>Caatinga</title><addtitle>Rev. Caatinga</addtitle><description>ABSTRACT Considering the importance of evaluating the compatibility between the exploration system usually used in the Caatinga and the vegetation regeneration process, this study aimed to evaluate the feasibility of recovering structural parameters in an experimental unit subjected to different management systems aged 9, 12, 16, 20 and 26 years post-exploitation. The area was subjected to clearcutting (CC) regimes and three types of selective cuttings (SC1 – selective cutting 1, cut of trees with diameter at the base – DAB &lt; 15 cm; SC2 – selective cutting 2, cut of trees with DAB &gt; 10 cm; and SC3 – selective cutting 3, cut of trees with DAB between 5 and 10 cm). In permanent plots of 20 m × 20 m, individuals with a circumference at breast height (CBH) ≥ 6 cm and a total height greater than 1.0 m were measured. Over the years of monitoring, the CC presented the lowest values of density, dominance, and volume, not obtaining a recovery in basal area and volume even after 26 years of regeneration. Treatments SC2 and SC3 stood out regarding recovery of the original woody biomass stock, presenting values higher than the original ones and indicating that the initial data did not correspond to the site's maximum potential. The forest dynamics pointed to the insufficiency of the 15-year clearcutting cycle in terms of recovering this region forest composition and structure. 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Os tratamentos SC2 e SC3 se sobressaíram quanto à recuperação do estoque original de biomassa lenhosa, apresentando valores superiores aos originais e indicando que os dados iniciais não correspondiam ao potencial máximo do sítio. 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Over the years of monitoring, the CC presented the lowest values of density, dominance, and volume, not obtaining a recovery in basal area and volume even after 26 years of regeneration. Treatments SC2 and SC3 stood out regarding recovery of the original woody biomass stock, presenting values higher than the original ones and indicating that the initial data did not correspond to the site's maximum potential. The forest dynamics pointed to the insufficiency of the 15-year clearcutting cycle in terms of recovering this region forest composition and structure. RESUMO Considerando a importância de se avaliar a compatibilidade entre o sistema de exploração usualmente empregado na Caatinga e o processo de regeneração da vegetação, este estudo objetivou avaliar a viabilidade de recuperação dos parâmetros estruturais em uma unidade experimental submetida a diferentes sistemas de manejo com idades de 9, 12, 16, 20 e 26 anos pós-exploração. A área foi submetida aos regimes de corte raso (CR) e três tipos de cortes seletivos (SC1 – corte seletivo 1, de árvores com diâmetro na base – DNB &lt; 15 cm; SC2 – corte seletivo 2, de DNB &gt; 10 cm; e SC3 – corte seletivo 2, de DNB entre 5 e 10 cm). Em parcelas permanentes de 20 m × 20 m, foram mensurados os indivíduos com CAP ≥ 6 cm e altura total superior a 1,0 m. Ao longo dos anos de monitoramento, o CR apresentou os menores valores de densidade, dominância e volume, não obtendo recuperação em área basal e volume mesmo após 26 anos de regeneração. Os tratamentos SC2 e SC3 se sobressaíram quanto à recuperação do estoque original de biomassa lenhosa, apresentando valores superiores aos originais e indicando que os dados iniciais não correspondiam ao potencial máximo do sítio. 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subjects AGRICULTURE, DAIRY & ANIMAL SCIENCE
AGRONOMY
FISHERIES
FOOD SCIENCE & TECHNOLOGY
FORESTRY
VETERINARY SCIENCES
title Structural dynamics in a seasonally dry tropical forest under different silvicultural systems
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