桉属树种与种源、家系比较试验

以９个桉属树种，其中８个种泊来自原产地，７个家系和７个杂种后代来自国内次生资源进行混合比较，５年生评价结果表明：树种、种源、家系呈极显著差异；尾叶桉及其两个种源、尾巨桉杂交种细叶桉的１３５４４种源适合本试验区戒严和格短轮伐期经营，可获得适应性和生长指标平均值超过平均水平３５％的选择效应。其中最优为１４５３４号尾叶桉种源，５年生单株材积０．０５０．６１ｍ＾３／株（８９．０３ｍ＾３／ｈｍ＾２）。种子采

Study on Selection of Eucalyptus Species/Provenances and Progeny

The results of 5-year study on Eucalyptus species,provenances and progeny trials involving 9 species and 8 provenances and 14 progenies(including 1 hybrids of E. urophylla×E. grandis)at Xinhui City,in centre of Guangdong Province showed that growth differences among species and provenances and progenies were highly significant.The growth of seedlot No.3 E. urophylla from superior trees of provenance trials(S14534)in Dongmen State Forest Farm of Guangxi region,2 provenances and 1 hybrid of E. urophylla×E. grandis and seedlot No.13544 E.tereticornis form 40 km N of Gladstone,QLD were better of all,with 35% of selecting gain at adaptability and growth characteristics.The best growth performance was from the superior trees of a provenance trails(S14534)in Dongmen State Forest Farm with a highly yield of 89.03 m³/hm² at the fifth year.There were poor growth performances of seeds selected from Leizhou Forest Bureau of E. cloeziana,E.ABL No.12 and 2 progenies of E. urophylla due to the lack of an effective pollen isolation and a genetic control for seed production.