03366naa a2200361 a 450000100080000000500110000800800410001902400380006010000190009824501500011726000090026752022770027665000130255365000150256665000220258165000260260365300180262965300180264765300170266565300240268265300220270665300250272870000210275370000210277470000200279570000220281570000210283770000190285870000210287770000250289870000170292377300640294020935382018-11-21       2018    bl uuuu     u00u1 u    #d7 a10.1016/j.foreco.2017.12.0382DOI1 aRESENDE, R. T.  aEnvironmental uniformity, site quality and tree competition interact to determine stand productivity of clonal Eucalyptus.h[electronic resource]  c2018  aThe major determinants of productivity in Eucalyptus plantations include the site productive capacity, local environmental uniformity, and the tree genetics, which impact their growth potential and competitiveness. While these factors have received a lot of attention individually, less attention has been given to the relative importance of these factors and the interactions between them. We examined these factors and their interactions using eight experiments located along a gradient in site productivity, consisting of 54 clonal genotypes (Eucalyptus urophylla × E. grandis hybrids) at two plant spacings (3 × 3.33 and 3 × 2 m). Stand productivity was quantified as the mean annual increment at age 6 years (m3 ha?1 year?1). Site productive capacity was represented using a site index based on mean dominant height at age 6 years. Environmental uniformity was calculated from within-plot variability in growth of very young stands using residual spatial autocorrelation. The competitive ability of a given phenotype was calculated as the percent loss in potential growth due to neighbor competition. Productivity increased with all variables but site quality had the greatest effect, followed by environmental uniformity and then competitive ability, with corresponding changes in productivity of about 30, 20 and 10 m3 ha?1 year?1, respectively, across the range of the given variable. With higher environmental heterogeneity, competition among genotypes increased, especially at dense spacing, showing that in such situations, highly competitive genotypes may display productivities similar to the less competitive genotypes in uniform environments. Experimental plots distributed across site quality and uniformity gradients provide opportunity for greater genetic differentiation than plots covering more homogeneous environments, reinforcing the recommendation of establishing genetic tests in locations with extreme site qualities. Our work suggests that the G × E interaction is linked to site quality and, to a lesser degree, to the local environmental uniformity. This work shows the value of adopting environmental gradient-based approaches in tree genetic testing and clone recommendation as a way to more accurately match genotypes to specific sites.  aBreeding  aEucalyptus  aForest management  aPhenotypic plasticity  aClonal forest  aEucalyptus sp  aMixed models  aPlant based indexes  aRandom regression  aStructural diversity1 aSOARES, A. A. V.1 aFORRESTER, D. I.1 aMARCATTI, G. E.1 aSANTOS, A. R. dos1 aTAKAHASHI, E. K.1 aSILVA, F. F. e1 aGRATTAPAGLIA, D.1 aRESENDE, M. D. V. de1 aLEITE, H. G.  tForest Ecology and Managementgv. 410, p. 76-83, Feb. 2018.