桉属树种与种源、家系比较试验

Study on Selection of Eucalyptus Species/Provenances and Progeny

以９个桉属树种，其中８个种源来自原产地，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、尾巨桉杂交种和细叶桉的１３５４４种源适合本试验区工业用材短轮伐期经营，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０．０５０６１ｍ３／株（８９．０３ｍ３／ｈｍ２）。种子采自雷州的大花序桉、刚果１２号桉和２个尾叶桉家系，适应性极显著低于平均水平；生长性状远比种子来自东门的差。其主要原因是在雷州更缺乏对上述树种的花粉隔离和种子遗传品质的有效控制。

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 m3/hm2 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.