Effects of environmental factors on decay rates of selected white- and brown-rot fungi
Effects of environmental factors on decay rates of selected white- and brown-rot fungi
复制标题
环境因素对白腐菌和褐腐菌腐烂率的影响
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
J. Morrell
中科院分区：
文献类型：
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作者：
June Mitsuhashi Gonzalez;J. Morrell
评估木结构中真菌腐烂的影响对建筑检查员构成了重大挑战。虽然已经开发了模型来预测不同气候条件下建筑构件的降解速率，但大多数模型都受到缺乏真菌侵袭对工程性能影响的基本数据的阻碍。开发关于不同条件下降解率的数据将有助于加强这些模型。在不同温度和湿度条件下，研究了2种褐腐菌和1种白腐菌对3种木材的降解能力。弹性模量（莫伊）是真菌攻击的最敏感的措施，而断裂模量（莫尔）的影响更慢。木材种类对莫尔损失没有影响，但木材耐久性确实影响真菌对莫尔的影响。白腐菌引起的莫伊损失与褐腐菌相当，但对莫尔的影响大大降低。在测试范围内，含水量对衰减率的影响很小。在最低温度（15 ℃）下，真菌的作用往往较慢，但在25 ℃和35 ℃之间差异不大。结果表明，如果动态性能是关键的，删除木材已经湿了一段时间是可取的。研究结果也支持将温度和时间的润湿因素纳入建筑模型。
Assessing the impact of fungal decay in wood structures poses a major challenge for building inspectors. Although models have been developed to predict degradation rate of building components in varying climatic conditions, most are hampered by the lack of fundamental data on effects of fungal attack on engineering properties. Developing data on degradation rates in differing conditions would help enhance these models. The ability of two brown-rot and one white-rot fungus to degrade wood of three species was assessed in varying temperature and moisture conditions. Modulus of elasticity (MOE) was the most sensitive measure of fungal attack, whereas modulus of rupture (MOR) was affected more slowly. Wood species had no effect on MOR losses, but wood durability did influence fungal effects on MOR. The white-rot fungus caused comparable MOE losses to the brown-rot fungi but had a much decreased effect on MOR. Moisture content, within the range tested, had little influence on decay rates. Fungal effects tended to be slower at the lowest temperature tested (15 � C) but differed little between 25 and 35 � C. Results suggested that removal of wood that has been wet for some time is advisable if dynamic properties are critical. Results also supported incorporating temperature and time of wetting factors into building models.