Density variations and demarcation of the juvenile wood in Norway spruce [part of a thesis, earlywood, latewood]

aclareo age altura arbre bois bois de jeunesse climatic factors crecimiento croissance densidad density edad facteur climatique fertilidad del suelo forest stands growth hauteur height juvenile wood madera madera joven methode methods muestreo peuplement forestier picea abies rodales sampling seasonal variation soil fertility stems tallo thinning tige trees wood