Aerial biomass allometric models for Prosopis affinis Spreng. in native Espinal forests of Argentina/ Modelos alometricos de biomassa aerea para Prosopis affinis Spreng. em florestas nativas Espinal da Argentina

• Published in: Revista brasileira de engenharia agrícola e ambiental 2019-06, Vol.23 (6), p.467
• Main Authors: Sione, Silvana M.J, Andrade-Castaneda, Hernan J, Ledesma, Silvia G, Rosenberger, Leandro J, Oszust, Jose D, Wilson, Marcelo G
• Format: Article
• Language: English
• ISSN: 1415-4366
• DOI: 10.1590/1807-1929/agriambi.v23n6p467-473

Estimation of carbon stored in forest ecosystems requires accurate biomass prediction tools. The objective of this study was to determine the individual aerial biomass of Prosopis affinis and its distribution by component, to develop allometric models for the estimation of biomass and to estimate biomass expansion factors (BEF) in native forests of Entre Rios (Argentina). Dendrometric variables on 30 individuals of different diameter classes were measured. Values of total aerial biomass and component biomass (trunk, branches larger than 5 cm in diameter and branches smaller than 5 cm + leaves, flowers and fruits) were determined using the destructive method. Different models were developed, and the best models were selected according to the adjusted coefficient of determination ([R.sup.2]adj), mean squared prediction error, the Akaike information and Bayesian information criteria and the Furnival index. The variables crown area, diameter at breast height and total height were the best estimators of total aerial biomass and component biomass of P affinis. The single-variable model based on the basal diameter has a very good predictive capacity for total aerial biomass, resulting in a simple model of great practicality. The BEF was significantly different among diameter classes, with mean values between 2.28 and 4.90. The highest values corresponded to individuals with trunk diameters larger than 25 cm. The models developed in this work present high precision ([R.sup.2]adj. > 0.94) for the prediction of total aerial biomass of P affinis and can be applied in the native forest area of the province of Entre Rios (Argentina). Key words: carbon reservoir, ecosystems, Fabaceae A estimativa do carbono armazenado nos ecossistemas florestais requer ferramentas precisas para prever a biomassa. Objetivou-se nesse estudo determinar a biomassa aerea individual de Prosopis affinis e sua distribuicao por componente; desenvolver modelos alometricos para prever a biomassa, e estimar os fatores de expansao da biomassa (FEB) em florestas nativas de Entre Rios (Argentina). Foram medidas variaveis dasometricas em 30 individuos de diferentes classes de diametro e determinada a biomassa aerea total e por componente (tronco, ramos com mais de 5 cm de diametro, e ramos menores que 5 cm + folhas, flores e frutos) pelo metodo destrutivo. A selecao dos modelos com melhor ajuste foi feita de acordo com o coeficiente de determinacao ajustado ([R.sup.2]adj), o erro medio quadratico de pr