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This work has been possible due to the financial support of the COMPOP_Timber project "Desarrollo de productos de ingenieria elaborados a base de tablones y chapas de chopo con inserciones de material compuesto para su uso en construccion" BIA201782650-R (http://compop.ugr.es/), and the SelviAgroTec project "Caracterizacion de la calidad de la madera en cultivos forestales de chopo y nogal mediante metodos no destructivos: efecto de la especie, el clon, tipo de plantacion y la estrategia de riego", AVA.AVA2019.047, from IFAPA (Instituto de Investigacion y Formacion Agraria y Pesquera de Andalucia), and the PP.TRA.TRA201600.14 project "Selvicultura Agraria: ampliacion y mantenimiento de la red de ensayos demostrativos de cultivos forestales". All the projects were EU FEDER funded. The auhors also thank to Dr. Jorge Castro-Gutierrez for its support to plantations GR during 9 years, to Industrias Monzon S.L. poplar plywood company for its support during harvesting the GU plantation, and Madera Pinosoria company for its support for timber sawing.

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Modulus of elasticity of I-214 young poplar wood from standing trees to sawn timber: influence of the age and stand density

Publicat a:European Journal Of Wood And Wood Products. 79 (5): 1225-1239 - 2021-04-16 79(5), DOI: 10.1007/s00107-021-01675-5

Autors: Gallego, Antolino; Ripoll, Maria A; Timbolmas, Cristian; Rescalvo, Francisco; Suarez, Elisabet; Valverde, Ignacio; Rodriguez, Maria; Navarro, Francisco B; Merlo, Esther

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Resum

The poplar wood industry chain from planted forests takes a strategic position for the creation of a competitive, profitable, and highly technological bioeconomy in the world. Niche sectors such as buildings can find in poplar wood an effective ally to reduce its carbon footprint and ecological backpack. For the poplar wood, it is important to understand the huge significance of the proper silvicultural management of a plantation and to characterize the raw material. In this context, this paper carries out such characterization for the particular case of young plantations of the clone I-214 (Populus x euroamericana (Dode) Guinier), commonly used for its high growth rate. The acoustic non-destructive characterization of poplar wood is carried out from standing trees, logs and sawn timber and then compared with the one obtained through destructive mechanical tests. The study shows that growth parameters are highly affected by the age and moderately affected by stand density, while mechanical properties are strongly affected by the age and less affected by the stand density. The study also shows high values of the linear regression coefficients between the mechanical properties obtained on standing trees, logs, and sawn timber using non-destructive and destructive methods (R-2 = 0.7 for all three cases), greater than those obtained for other species. A good linear fitting was obtained between the tree and log velocities (R-2 = 0.76) and between the tree and log elastic moduli (R-2 = 0.85). Consequently, the evaluation of the mechanical properties employing the optimized acoustic protocol provides a reliable characterization for the poplar wood.

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