Accuracy and efficiency evaluation of point-centered quarter method variations for vegetation sampling in an araucaria forest

Revista Árvore

Graziele Hernandes Volpato²  Sebastião Venâncio Martins¹  Joema Carvalho¹  Luiz Dos Anjos¹ 

[1] ,Universidade Federal de Viçosa Programa de Pós-Graduação em Ciência Florestal ,Brasil

关键词: Sampling methods;    Phytosociology and Mixed Ombrophylous Forest;    Método de amostragem;    Fitossociologia e Floresta Ombrófila Mista;   

DOI  :  10.1590/S0100-67622010000300015

来源: SciELO

【 摘 要 】

In order to verify Point-Centered Quarter Method (PCQM) accuracy and efficiency, using different numbers of individuals by per sampled area, in 28 quarter points in an Araucaria forest, southern Paraná, Brazil. Three variations of the PCQM were used for comparison associated to the number of sampled individual trees: standard PCQM (SD-PCQM), with four sampled individuals by point (one in each quarter), second measured (VAR1-PCQM), with eight sampled individuals by point (two in each quarter), and third measuring (VAR2-PCQM), with 16 sampled individuals by points (four in each quarter). Thirty-one species of trees were recorded by the SD-PCQM method, 48 by VAR1-PCQM and 60 by VAR2-PCQM. The level of exhaustiveness of the vegetation census and diversity index showed an increasing number of individuals considered by quadrant, indicating that VAR2-PCQM was the most accurate and efficient method when compared with VAR1-PCQM and SD-PCQM.

【 授权许可】

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