Diametric structure in a community of shrub-tree Caatinga, municipality of Floresta, state of Pernambuco, Brazil

Robson Borges De Lima,Gilson Fernandes Da Silva,Rinaldo Luiz Caraciolo Ferreira,Francisco Tarcísio Alves Júnior,Cinthia Pereira De Oliveira,José Antônio Aleixo Da Silva

doi:10.5380/rf.v48i1.54736

Abstract

This study aimed to analyze the diametric structure of the stand and of five species of highest importance value for a Caatinga area, located in the municipality of Floresta, state of Pernambuco, Brazil. The work was developed from 40 sample units of 400 m² each, systematically allocated. All individuals with tree circumference at the base (0.30 m) greater than or equal to 6 cm were measured. The "q" quotient of De Liocourt was used to verify discrepancies between recruitment rates and mortality. We reported that, for the studied area, the species Poincianella bracteosa(Tul.) L. P. Queiroz, Mimosa ophthalmocentra Mart. ex Benth., Aspidosperma pyrifolium Mart., Myracrodum urundeuva(Engl.) Fr. All., and Bauhinia cheilanta(Bong). Steud represented 77.25% of the total density sampled. The diametric distributions indicated that regeneration occurs continuously. Through the "q" quotient, it can be inferred that, for the study stand, Myracrodum urundeuva and Poincianella bracteosa, the individual’s mortality has been compensated by recruitment in different diameter classes. However, the diametrical structure for Mimosa ophthalmocentra, Aspidosperma pyrifolium, and Bauhinia cheilanta indicated problems of maintenance and development for these species.

Highlights

Among tropical and subtropical forest categories in the world, dry forests comprise less than half of them (POWERS et al, 2009)
The objective of this study was to analyze the diameter structure of the shrub-tree community and of the species of highest importance value (IV) for a Caatinga area located in the municipality of Floresta, state of Pernambuco, Brazil
It was noted that Poincianella bracteosa concentrated approximately 47.9% of the individuals sampled, with an average similar to that found in the stand

Summary

Introduction

Among tropical and subtropical forest categories in the world, dry forests comprise less than half of them (POWERS et al, 2009). Despite their importance, they are among the most threatened and least studied forest ecosystems. They are among the most threatened and least studied forest ecosystems As a result, they may be under higher risk than rainforests (PORTILLO-QUINTERO; SÁNCHEZAZOFEIFA, 2010; AIDE et al, 2012). They may be under higher risk than rainforests (PORTILLO-QUINTERO; SÁNCHEZAZOFEIFA, 2010; AIDE et al, 2012) This type of forest presents different diameter distributions, both in its amplitude and form. The diameter distribution descriptive analysis by means of statistical models is a technique that implicitly predicts the current yield, as FLORESTA, Curitiba, PR, v. 48, n. 1, p. 133-142, jan./mar. 2018

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