The resistance of wood against fungal decay, in short the natural durability, is one of the main criteria for defining the potential use of a wood species. Wood collections, or xylaria, offer the unique opportunity to screen many specimens and species for the latter purpose yet sample size is often limited and standardized tests are often not possible neither desired given the historical and cultural value of these specimens. Two different methods to determine the natural durability are tested and presented here, more specifically the mini-block test and chemical fingerprinting by Direct Analysis in Real-Time Time-Of-Flight Mass Spectrometry (DART TOFMS). Fungal decay by Trametes versicolor was determined for 577 mini-blocks collected from xylarium specimens and 602 mini-blocks from commercial species, not belonging to the xylarium collection, were included as a benchmark. Mass loss percentages of the different species are similar to reported values, supporting the use of the mini-block test when standardized testing is hardly feasible. Furthermore, as expected there is also a significantly negative relationship between density and the mass loss percentages from the mini-block test ( r -Spearman = − 0.65***). Finally, partial least square-based prediction of recorded mass loss by using the DART TOFMS chemical fingerprints is promising ( R 2 -adjusted = 0.40***), yet the accuracy differs between species.

中文翻译：

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评估木兰标本的自然耐久性：小样本的小块测试和化学指纹识别

木材对真菌腐烂的抵抗力，简而言之，自然耐久性，是定义木材种类潜在用途的主要标准之一。木材收集品或木属植物提供了独特的机会来筛选许多标本和物种以用于后一目的，但样本量通常是有限的，并且鉴于这些标本的历史和文化价值，标准化测试通常是不可能的。这里测试并展示了两种不同的确定自然耐久性的方法，更具体地说，是通过实时飞行时间质谱 (DART TOFMS) 中的直接分析进行的小块测试和化学指纹识别。对从木兰标本中收集的 577 个迷你块和从不属于木兰收集的商业物种中收集的 602 个迷你块确定了变色栓菌的真菌腐烂，被列为基准。不同物种的质量损失百分比与报告值相似，支持在标准化测试几乎不可行时使用小块测试。此外，正如预期的那样，密度与小块测试的质量损失百分比之间也存在显着的负相关关系 (r -Spearman = − 0.65***)。最后，使用 DART TOFMS 化学指纹对记录的质量损失进行基于部分最小二乘法的预测是有希望的（R 2 调整 = 0.40***），但准确度因物种而异。正如预期的那样，密度和小块测试的质量损失百分比之间也存在显着的负相关关系（r -Spearman = − 0.65***）。最后，使用 DART TOFMS 化学指纹对记录的质量损失进行基于部分最小二乘法的预测是有希望的（R 2 调整 = 0.40***），但准确度因物种而异。正如预期的那样，密度和小块测试的质量损失百分比之间也存在显着的负相关关系（r -Spearman = − 0.65***）。最后，使用 DART TOFMS 化学指纹对记录的质量损失进行基于部分最小二乘法的预测是有希望的（R 2 调整 = 0.40***），但准确度因物种而异。