Abstract
Abstract Based on airborne LIDAR data on canopy morphology and height of Amazon forest trees, we developed allometric models to estimate dry biomass stored in the boles of dominant and co-dominant individuals and compared these results with those from equations based on traditional variables such as diameter at breast height (DBH). The database consisted of 142 trees of interest for logging in a forest under management for timber in Brazil's state of Acre. The trees chosen for study were selected through proportional sampling by diameter class (ranging from 45 to 165 cm DBH) in order to properly represent the dominant and co-dominant tree populations with diameters appropriate for harvest. Subsequent to LIDAR profiling of these trees, they were felled, subjected to a battery of dimensional measurements and sampled for wood-density determination. A set of models was generated, followed by model selection and identity testing in order to compare groups of basic wood density (low, medium and high). The morphometric variables of the crown had high explanatory power for bole biomass independent of whether the allometric equations included DBH. When calculating bole biomass with equations that include basic wood density, the best estimate is obtained using variables for both DBH and crown morphology. To obtain an allometric equation that encompasses species in all three classes of basic density, one should either use only independent variables representing crown dimensions or complement these with variables for basic density (BD) and total height (Ht). The study demonstrates the feasibility of using ground-based measurements to calibrate biomass models that include only LIDAR-based variables, allowing much larger areas to be surveyed with reasonable accuracy. The present study is designed to produce data needed for forest management, but the methods developed here can be adapted to studies aimed at reducing the uncertainty in biomass estimates of whole forests (not just harvestable trees) for use in quantifying carbon emissions from forest loss and degradation.
Highlights
In recent years great advances have been made in the planning and implementation of forest-management operations in Brazil's Amazon region using precision management techniques (Figueiredo et al, 2007)
Because the present study is focused on the bole biomass of trees intended for the timber industry that are cut as part of forest management, sampling is for trees with diameter at breast height (DBH) ≥ 45 cm
The study shows the viability of measuring crown morphological variables and total height in Amazonian forest based on airborne LIDAR data alone
Summary
In recent years great advances have been made in the planning and implementation of forest-management operations in Brazil's Amazon region using precision management techniques (Figueiredo et al, 2007). Precision management integrates the use of geographical positioning system (GPS) and geographical information system (GIS). Airborne LIDAR (Light Detection And Ranging) technology has recently been shown to have wide application in precision management of tropical forests, allowing information on relief and hydrographic structure to be obtained with sub-meter accuracy over large tracts of forest (d'Oliveira et al, 2012). Use of laser profiling improves the quality of planning for infrastructure (such as the network of roads, storage yards and skid trails in the monitoring of forest operations) and in estimating the volume and biomass of managed forests. Figueiredo et al / Remote Sensing of Environment 187 (2016) 281–293
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