Abstract
Summary Sixteen provenances of spotted gum — eight provenances of Corymbia variegata, seven provenances of C. maculata and one provenance of C. henryi — were assessed for growth and form in two trials, 13.5 y old, established on former bauxite mines in the northern jarrah forest of Western Australia. At Jarrahdale, C. henryi yielded the greatest volume followed by C. maculata and C. variegata. At Huntly, C. maculata yielded the greatest volume followed by C. henryi and C. variegata. Form was similar at both sites, with C. variegata having the largest proportion of single-stemmed trees followed by C. maculata and C. henryi. For straightness of single-stemmed trees, C. variegata and C. maculata were similar on both sites whilst C. henryi was the most crooked. C. variegata had the smallest branches followed by C. henryi and C. maculata. Across-site interactions, between Jarrahdale and Huntly, were not significant at the species level nor at the provenance within species level. Best provenances of C. maculata and C. variegata tended to be the same at both sites. C. maculata is the preferred species for growth on the mined environment because of greater volume production and better survival. A comparison of these results with those obtained at age 4.5 y indicates that selection of the best seed sources should be delayed for as long as possible.
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