Abstract
The determination of leaf area is of fundamental importance in studies involving ecological and ecophysiological aspects of forest species. The objective of this research was to adjust an equation to determine the leaf area of Ceiba glaziovii as a function of linear measurements of leaves. Six hundred healthy leaf limbs were collected in different matrices, with different shapes and sizes, in the Mata do Pau-Ferro State Park, Areia, Paraíba state, Northeast Brazil. The maximum length (L), maximum width (W), product between length and width (L.W), and leaf area of the leaf limbs were calculated. The regression models used to construct equations were: linear, linear without intercept, quadratic, cubic, power and exponential. The criteria for choosing the best equation were based on the coefficient of determination (R²), Akaike information criterion (AIC), root mean square error (RMSE), Willmott concordance index (d) and BIAS index. All the proposed equations satisfactorily estimate the leaf area of C. glaziovii, due to their high determination coefficients (R² ≥ 0.851). The linear model without intercept, using the product between length and width (L.W), presented the best criteria to estimate the leaf area of the species, using the equation 0.4549*LW.
Highlights
IntroductionIts distribution and ecological range are restricted to Northeast Brazil, with records for the states of Ceará, Bahia, Pernambuco and Paraíba (NASCIMENTO, 2012)
The leaf blades of C. glaziovii varied in length (L) from 1.57 to 13.94 cm, with a mean of 8.59 cm; width (W) varied from 0.90 to 17.96 cm with a mean of 10.85 cm; and real leaf area (LA) varied from 0.49 to 109.87 cm2 with a mean of 45.80 cm2
Length and width had the lowest coefficients of variation (25.88 and 31.58%, respectively), while the product of length x width (50.72%) and real leaf area (51.56%) had the highest (Table 1)
Summary
Its distribution and ecological range are restricted to Northeast Brazil, with records for the states of Ceará, Bahia, Pernambuco and Paraíba (NASCIMENTO, 2012). It occurs in Caatinga vegetation and areas of mountainous relief, as well as in rainforests of the Atlantic Forest surrounded by xerophilous vegetation known as “Brejos de Altitude” (LEAL et al, 2011). The stem bark of barriguda is used in traditional medicine to treat various diseases, such as inflammation, hypertension, diabetes and rheumatism, among others (SILVA et al, 2015). The seeds are used in the manufacture of upholstery such as pillows and mattresses (SILVA et al, 2016)
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