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首页> 外文期刊>Australian Forestry >Influence of tree age and density on the above-ground natural durability of eucalypt species at Innisfail
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Influence of tree age and density on the above-ground natural durability of eucalypt species at Innisfail

机译：树木年龄和密度对Innisfail桉树树种地上自然耐久性的影响

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An above-ground flat-panel test was conducted at Innisfail to determine the influence of tree age on natural durability against decay of heartwood of eucalypt species grown in low-rainfall areas. After nine years' exposure, heartwood from trees aged 30-50 or 80+ years had similar natural durabilities in Eucalyptus sideroxylon, Corymbia spp., E. cladocalyx and E. occidentalis. However, except for E. cladocalyx, the heartwood from trees less than 25 years old was less durable than that from older trees for Corymbia spp., E. leucoxylon, E. occidentalis and E. sideroxylon. Density was a useful predictor of natural durability, especially in the lower range that differentiated wood in young trees. The importance of density within the more-mature tree age ranges of 30-50 years and 80+ years was unclear, perhaps showing that a threshold age for the production of mature heartwood had been reached. Comparisons, including with the yardstick species Pinus radiata, E. regnans, E. obliqua and E. camaldulensis, suggest that E. occidentalis could be assigned a class-2 above-ground natural durability rating in AS 5604, while the class-1 rating for E. astringens should be re-examined.
机译：在Innisfail进行了地上平板测试，以确定树木年龄对低雨量地区生长的桉树树种抗心材衰变的自然耐久性的影响。暴露9年后，30至50或80年以上树龄的心材在宽叶桉，Corymbia spp。，E。cladocalyx和E. occidentalis中具有相似的自然耐久性。但是，除了枝叶桉之外，对于Corymbia spp。，Leucoxylon，E。o​​ccidentalis和E. sideroxylon，来自年龄小于25年的树木的心材不如来自老树的心材耐久。密度是自然耐久性的有用预测指标，尤其是在使幼木中的木材与众不同的较低范围内。在30-50岁和80岁以上的较成熟树龄范围内，密度的重要性尚不清楚，这也许表明已经达到了成熟心材生产的临界年龄。比较，包括与标尺树种辐射松，大肠埃希菌，大叶埃希氏菌和卡玛杜兰E. camaldulensis的比较，可以将东隐埃希菌在AS 5604中指定为地上二级自然耐久性等级，而在一级等级中为自然耐久性。对于E.收敛剂，应重新检查。

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