Dasometric Analysis Applying Terrestrial Laser Scanner and Conventional Techniques for the Estimation of Aboveground Biomass in a Forest of the Inter-Andean Valley in Ecuador

Monitoring of forest ecosystems through the knowledge of aboveground biomass (AGB) is fundamental for the adequate development of management plans in natural resources and for the improvement of wellbeing of the local as well as global population. The amount of biomass is estimated by means of allometric equations that include dasometric variables such as the normal diameter of the tree (D), whose values are determined by applying conventional techniques of forest measurements and alternative methodologies such as the terrestrial laser scanner system. The main aim of the current study has been to analyze the D values of the trees applying a static terrestrial laser-scanning (TLS) technology and conventional techniques (CT) to estimate the AGB in a sector of the “La Armenia” forest, in the central Inter-Andean Valley of Ecuador. Two plots have been defined, with the purpose of optimizing the capture and handling of the terrestrial LIDAR information obtained through the Faro Focus 3D laser scanner, as well as facilitating the field work using a tape measure in the determination of the D of the trees from the generated three-dimensional models. Hereby, the D of 93 trees located within the project's application area have been yielded digitally. We verified statistically that the values of the D of the studied trees applying TLS, are similar within errors as those obtained using TC, given that the hypothesis of equality has been accepted when performing the Z and Chi squared tests, in addition to the Pearson coefficient (R
²
= 0.995), which indicated a strong correlation of the given variables. Finally, a total of 334,111 tn / ha of forest AGB has been estimated. The amount of biomass estimated based on direct observations of the territory through the application of TLS, provides essential information for decision making in the implementation of policies on forest management in the country.