Height-age and height-diameter relationships for monocultures and mixtures of eastern cottonwood clones

Data from an eastern cottonwood clonal mixing study in MissisGppi and Kentucky. USA. were used to test the effects of plant ing location\ and genetic\ (c lonal proport ion\) on height&age and heightkdbh functions. Planting locations. which accounted for 5.65: of the variation 111 obervetl dominant height growth ( /> = 0.0001 1. were more important than clonal proportions. V, hich accounted for onl) I .O’% of the variation ( p = 0.0077). Interactions between clones in mixtures were not \ignil’icant ( p = 0.9 17X). hut thy-w ca\e\ of 01 w and undcrcompenaatit,n paralleled those observed for basal area. Planting locat ion\ wt‘re a~aociatcd with difference\ in maximum height in the height-dbh funct ion and clonal proport ions were as\oclated uith difference\ in height of tl-ccj wtth \maIIc‘r than average dhh Although statistically significant, the effects of planting location and clonal proportion Mere not important enough to incorporate into the final height-&h model.