Above-ground biomass equations for Pinus radiata D. Don in Asturias

Abstract

Aim of the study: The aim of this study was to develop a model for above-ground biomass estimation for Pinus radiata D. Don in Asturias.Area of study: Asturias (NE of Spain). Material and methods: Different models were fitted for the different above-ground components and weighted regression was used to correct heteroscedasticity. Finally, all the models were refitted simultaneously by use of Nonlinear Seemingly Unrelated Regressions (NSUR) to ensure the additivity of biomass equations.Research highlights: A system of four biomass equations (wood, bark, crown and total biomass) was develop, such that the sum of the estimations of the three biomass components is equal to the estimate of total biomass. Total and stem biomass equations explained more than 92% of observed variability, while crown and bark biomass equations explained 77% and 89% respectively.

Potencial de las plantaciones de Pinus radiata para el aprovechamiento de los residuos de cosecha en suelos característicos del centro-sur de Chile

“…The structure of the fitted estimation model has been mainly used for estimating total aboveground biomass (Moore, 2010) and stem wood and bark biomass (Canga et al 2013), not only for P. radiata but also for other species (Ter-Mikaelian & Korzukhin, 1997), and a good fit for estimating potential harvest residue biomass at individual tree level has been observed.…”

“…Several studies have fitted biomass estimation models at individual tree level at the local and regional scale (Canga et al 2013, Jenkins et al 2003, Merino et al 2003Moore, 2010;Rodríguez et al 2003;. However, few are those that after scaling biomasses up to stand level for P. radiata fit estimation models at this scale (Bi et al 2010;Corvalán & Hernández, 2011).…”

“…La estructura del modelo de estimación ajustado ha sido utilizado principalmente para la estimación de la biomasa aérea total (Moore, 2010), de la biomasa de madera y corteza del fuste (Canga et al 2013), no solo para P. radiata sino también para otras especies (Ter-Mikaelian & Korzukhin, 1997); también se ha observado un buen ajuste para la estimación de la biomasa potencial de residuos de cosecha a nivel de árbol individual.…”

“…Varios estudios han realizado el ajuste de modelos de estimación de biomasa a nivel de árbol individual a escala local y regional (Canga et al 2013, Jenkins et al 2003, Merino et al 2003Moore, 2010;Rodríguez et al 2003;Rubilar et al 2010). Sin embargo, resultan escasos aquellos que luego de escalar las biomasas a nivel de rodal para P. radiata realizan el ajuste de modelos de estimación a esta escala (Bi et al 2010;Corvalán & Hernández, 2011).…”

Estimate of biomass and carbon pools in disturbed and undisturbed oak forests in Tunisia

“…In this method, different mathematical equations, with different independent variables and weights, were used for each tree biomass component (Canga et al, 2013). The additivity was guaranteed by setting restrictions on the equation coefficients (Canga et al, 2013). Since we were dealing with a system of nonlinear equa-5…”