The wood ofPinus nigrapopulations planted in Portugal, comparatively toPinus pinaster, has higher total extractive content, lower Klason lignin and H/G ratio, and similar mechanical properties, presenting advantages for industrial purposes. P. nigra was used in the reforestation of mountainous areas in Portugal, but its wood chemical and mechanical properties were never studied. This work intends to evaluate the chemical and mechanical wood properties of the P. nigra populations planted in Portugal, to relate these properties with previously characterised physical features and to compare these data with other European P. nigra stands and species, namely, P. pinaster. Wood chemical and mechanical properties were analysed in 90 trees from six Portuguese sites, using near-infrared (NIR) spectrometry and the three-point bending test. The wood of the P. nigra populations planted in Portugal presented average values of total extractive content = 9.4%, Klason lignin = 26.69%, MORRad = 14.93 MPa and MOERad = 1200.98 MPa. Ring density showed no significant correlation with ring width. The P. nigra populations planted in Portugal presented qualitative and quantitative properties similar to P. pinaster wood, the main resinous species in Portugal. Facing the lack of raw material for wood industry due to frequent forest fires in the Mediterranean region, P. nigra could be used to reforest mountainous areas of those regions.

中文翻译：

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生长在葡萄牙的黑松的物理、化学和机械木材特性

种植于葡萄牙的黑松的木材与松树相比，总提取物含量更高，Klason木质素和H/G比更低，机械性能相似，在工业用途上具有优势。P. nigra 被用于葡萄牙山区的重新造林，但从未研究过它的木材化学和机械特性。这项工作旨在评估种植在葡萄牙的 P. nigra 种群的化学和机械木材特性，将这些特性与先前表征的物理特征相关联，并将这些数据与其他欧洲 P. nigra 林分和物种，即 P. pinaster 进行比较. 使用近红外 (NIR) 光谱法和三点弯曲试验，对来自葡萄牙六个地点的 90 棵树木的化学和机械性能进行了分析。P的木头。在葡萄牙种植的黑种种群的总提取物含量平均值 = 9.4%，Klason 木质素 = 26.69%，MORRad = 14.93 MPa 和 MOERad = 1200.98 MPa。环密度与环宽无显着相关性。在葡萄牙种植的 P. nigra 种群呈现出类似于葡萄牙主要树脂树种 P. pinaster wood 的定性和定量特性。由于地中海地区频繁发生森林火灾，木材行业缺乏原材料，因此可以利用黑木来为这些地区的山区重新造林。在葡萄牙种植的 nigra 种群呈现出类似于葡萄牙主要树脂树种 P. pinaster wood 的定性和定量特性。由于地中海地区频繁发生森林火灾，木材行业缺乏原材料，因此可以利用黑木来为这些地区的山区重新造林。在葡萄牙种植的 nigra 种群呈现出类似于葡萄牙主要树脂树种 P. pinaster wood 的定性和定量特性。由于地中海地区频繁发生森林火灾，木材行业缺乏原材料，因此可以利用黑木来为这些地区的山区重新造林。