1 23 Annals of Forest Science Official journal of the Institut National de la Recherche Agronomique (INRA) ISSN 1286-4560 Volume 70 Number 7 Annals of Forest Science (2013) 70:743-750 DOI 10.1007/s13595-013-0316-6 Modulus of elasticity declines with decreasing planting density for loblolly pine (Pinus taeda) plantations Ralph L. Amateis, Harold E. Burkhart & Gi Young Jeong