Anuário do Instituto de Geociências (Mar 2019)

Spectral Behavior of Paricá (Schizolobium parahyba var. amazonicum (Huber ex Ducke) Barneby) in Plantations of Different Ages

  • Fábio de Jesus Batista,
  • Luciana Maria de Barros Francez,
  • Elisiane Alba,
  • Mateus Sabadi Schuh,
  • José Augusto Spiazzi Favarin,
  • Janderson de Oliveira Silva,
  • Noé dos Santos Hofiço,
  • Rudiney Soares Pereira,
  • Elódio Sebem

DOI
https://doi.org/10.11137/2018_3_82_95
Journal volume & issue
Vol. 41, no. 3
pp. 82 – 95

Abstract

Read online

The objective of this study was to establish the spectral behavior of homogenous Paricá plantations (S. parahyba var. amazonicum) at different ages and to identify the best vegetation index for the study of the species with SENTINEL-2A satellite images. The study was carried out at three Farms (sites): Capinzal 2 (CAP2), Pingo de Ouro (PO) and Pingo de Ouro 2 (PO2), located in Ulianópolis, state of Pará. At CAP2 Farm, an area of 36.54ha was selected, the forest presented 57 months. At PO2, the field had 29.77ha of Paricá, planting had 42 months and in PO site the planting had 44.48ha (78 months). The image of SENTINEL-2A was obtained through the USGS website for scene T22MHA, 07/26/2016. Qgis version 2.14.20 was used considering the SIRGAS2000 DATUM and the UTM 23S projection. With the aid of the Semi-Automatic Classification plugin, the atmospheric correction of the image was performed by the DOS method. Subsequently, the image was the basis for the calculation of 35 vegetation indices. The data collection in the image occurred systematically, 47 points were implemented, distributed as follows: 17 in CAP2, nine in PO2 and 21 in PO. From each point the reflectance value of the spectral bands and vegetation indices were extracted and Shapiro-Wilk and Levene tests were applied. The comparison of the spectral behavior between the stands done by the analysis of variance and followed by the Tukey’s mean test. When normality was not satisfied, comparisons were made by the Mann-Whitney U test. The correlation between vegetation indexes was defined. The identification of the index that best represented the stands was performed through Principal Component Analysis, based on the standardized data. All the statistical analysis performed with RStudio 3.4.3 support. There were differences in reflectance rates of the species in relation to Band 8, and this fact may be associated with differences in age. The vegetation index most correlated with Paricá, regardless of age, was the Log Relationship.

Keywords