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王桉做为一个外来树种,其重要性在新西兰正日益增加。现在最大的造林规划是新西兰林产品有限公司在 Tokoroa 的造林计划。王桉已造林分散在各州的森林中,但许多由于寒害而造成失败。尤其是用 Waitai,Otago 当地种源造林失败严重。选择最耐寒的种源造林是这个种种得以改良成功的一条途径,以及这种能够生长的立地范围内得以改良成功的途径。来源于王桉天然生长区域和新西兰外来引种林分所提供的38个不同种源的苗木,分别于秋季,冬季和春季放置在 Palmerston 北部的环境控制室内进行寒害试验。同样的材料于野外种植在三个立地上经受1978年冬季的自然严寒,严寒的伤害对各种苗木可看到伤害记号。
As an alien species, the importance of eucalyptus is increasing in New Zealand. The largest afforestation program now is New Zealand Forest Products Ltd.’s afforestation program in Tokoroa. Eucalyptus has been afforestation scattered throughout the forests of the states, but many have failed because of chills. In particular, afforestation in the native provenance of Waitai, Otago, has failed significantly. Choosing the hardest source of provenance is one way this success can be improved and the way to improve success within this growing site. Thirty-eight seedlings of different provenances, originating from the natural growth area of Eucalyptus grandis and New Zealand alien introduced stands, were placed in environmental control rooms in northern Palmerston for cold injury tests in autumn, winter and spring respectively. The same material was planted in the field in three locations to withstand the natural cold and cold of the winter of 1978. Injuries can be seen on various seedlings.