Relationships between environmental variables and several growth indicators of unthinned coniferous plantations (Pinus halepensis, Pinus radiata, Cedrus deodaraandCupressus sempervirens f. horizontalis)were studied using correlation analysis and stepwise multiple regression in Ventania, a hilly zone in southern Buenos Aires, Argentina. Growth ofP. radiatawas affected mainly by gross climatic factors, whilstP. halepensisandC. deodarawere influenced by soil and topographic factors. Growth ofC. sempervirenswas investigated in a more restricted range of site conditions and could be related to soil fertility and moisture factors. The regression models explained 60#x2013;85 of the variation in site index.
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