Allometric equations to estimate the leaf area of Psychotria colorata (Willd. Ex Schult.) Müll.Arg.

João Everthon da Silva  Ribeiro; Francisco  Romário Andrade Figueiredo; Ester  dos Santos Coêlho; Marlenildo Ferreira Melo

doi:10.14393/BJ-v37n0a2021-53711

Authors

João Everthon da Silva Ribeiro Universidade Federal da Paraíba https://orcid.org/0000-0002-1937-0066
Francisco Romário Andrade Figueiredo Universidade Federal Rual do Semi-Árido https://orcid.org/0000-0002-4506-7247
Ester dos Santos Coêlho Universidade Federal Rural do Semi-árido https://orcid.org/0000-0002-5541-1937
Marlenildo Ferreira Melo Universidade Federal Rural do Semi-árido https://orcid.org/0000-0001-7449-6916

DOI:

https://doi.org/10.14393/BJ-v37n0a2021-53711

Keywords:

Allometric equations, Leaf blade, Modeling, Perpétua-do-mato, Rubiaceae

Abstract

Estimating leaf area using non-destructive methods from regression equations has become a more efficient, quick, and accurate way. Thus, this study aimed to propose an equation that significantly estimates the leaf area of Psychotria colorata (Rubiaceae) through linear leaf dimensions. For this purpose, 200 leaves of different shapes were collected, and length (L), width (W), product of length by width (L.W), and real leaf area (LA) of each leaf blade were determined. Then, equations were adjusted for predicting leaf area using simple linear, linear (0.0), quadratic, cubic, power, and exponential regression models. The proposed equation was selected according to the coefficient of determination (R²), Willmott's agreement index (d), Akaike's information criterion (AIC), mean absolute error (MAE), mean squared error (RMSE) and BIAS index. It was noted that the equations adjusted using L.W met the best criteria for estimating leaf area, but the equation LA = 0.59 * L.W from linear regression without intercept was the most suitable. This equation predicts that 59% of leaf area is explained by L.W. Concluding, the leaf area of P. colorata can be estimated using an allometric equation that uses linear leaf blade dimensions.

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