Abstract
This study evaluates the influence of the cropping system in the extraction of Eucalyptus benthamii metrics by terrestrial laser scanner (TLS) and by traditional inventory. The hypothesis is that the extraction methods do not differ significantly from each other. The study area consists of a conventional planting system under 3 x 2 m spacing, and a CFI (crop-forest integration) system under 14 x 2 m spacing. To obtain the variables DBH (diameter at 1.3 m aboveground) and total height (H), we used a traditional inventory and collected data with TLS. For point cloud processing, we manually extracted the metrics DBH and H by simple scanning. We estimated total volume (V) by a fitted equation that matches the characteristics of the study area. To estimate above-ground biomass (AGB), we fitted models based on AGB data provided by the NITA project and by BIOFIX. Better visualization of trees in the CFI system facilitated metric extraction, leading to less data variability. In addition, DBH, V, and AGB values were higher in the CFI system compared to the conventional system. However, when including the number of trees per hectare, the conventional system is more productive. The initial hypothesis was confirmed. Therefore, metric extraction using the traditional inventory and TLS methods did not differ significantly for the two cropping systems considered.
Highlights
Advances in forestry technology have focused on the search for new ways to estimate dendrometric variables
Analysis of dendrometric variables The DBH metrics showed a linear relationship in the conventional system, with a correlation of 0.99 between the two collecting methods (Figure 3)
DBH showed the least variation in relation to the traditional forest inventory and the metrics obtained with Terrestrial Laser Scanner (TLS)
Summary
Advances in forestry technology have focused on the search for new ways to estimate dendrometric variables. Terrestrial Laser Scanner (TLS) enables fast, accurate, and automatic recording of the forest structure (LIANG et al, 2018; FARDUSI et al, 2017; MOSKAL, ZHENG, 2012) This procedure includes the pulsing of thousands of laser beams in the environment, and the recording of their returns in three-dimensional coordinates, generating a 3D point cloud (NEWNHAN et al, 2015). This enables extraction of dendrometric variables from tree reconstitution, becoming an alternative to traditional measurement methods in forest inventories (KANKARE et al, 2015). TLS enables simple scanning, with a single scanning point (ASTRUP et al, 2014); or FLORESTA, Curitiba, PR, v. 51, n. 2, p. 512-520, abril/jun 2021
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