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首页> 外文期刊>Folia Forestalia Polonica: Series A - Forestry >Proportion of knotty wood in stems of 28-year old lodgepole and Scots pine in experimental plantation in Zvirgzde, Latvia
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Proportion of knotty wood in stems of 28-year old lodgepole and Scots pine in experimental plantation in Zvirgzde, Latvia

机译：拉脱维亚Zvirgzde实验性人工林中28年生黑麦草和苏格兰松树茎中的棘节木材比例

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In forestry, alien tree species are planted to maximize yield from a stand by increasing productivity and decreasing environmental risks. In Eastern Europe, lodgepole pine (Pinus contorta var. latifolia) might be used as a source of biomass and industrial wood; however, before any recommendations are given, possible gains of the novel species should be scrupulously evaluated. In this study, we compared volume and proportion of knotty stemwood (VKN) of native Scots pine (Pinus sylvestris) from first generation seed orchards and provenances of alien lodgepole pine [Fort Nelson (58°38’ N, 122°41’ W) and Summit Lake (54°24? N, 122°37? W)] at the age of 27 years growing in central Latvia. We also assessed the relationships between VKN and several morphometric parameters.Stem diameter of both species was similar; however, Summit Lake provenance of lodgepole pine exceeded Scots pine in height, while Fort Nelson provenance was lower than Scots pine. Although Scots pine produced nearly two times less whorls than lodgepole pine, volume of knotless stemwood did not differ significantly between the species; though it was higher for Summit Lake provenance of lodgepole pine compared to Scots pine. In contrast, the proportion of VKN differed significantly between both the species and the provenances. Scots pine showed the lowest proportion of VKN (~ 9%) and Fort Nelson provenances of lodgepole pine showed the highest proportion of VKN (~ 14%). Thus, Summit Lake appears more suitable for the production of industrial wood amongst the provenances of lodgepole pine; nevertheless, higher quantity of leftover material is expected. Some morphometric parameters correlated with VKN and the proportion of VKN, but these relationships differed between species and provenances. The total cross-section of branches was the best predictors of VKN for Scots pine and Fort Nelson provenance of lodgepole pine, while stem diameter showed the strongest correlation for Summit Lake provenance. Number of whorls and mean diameter of living branches were the best predictors of the proportion of VKN for lodgepole pine and Scots pine, respectively. Accordingly, morphometric parameters might be useful for the selection of the best trees of lodgepole pine.
机译：在林业中，种植外来树种可通过提高生产力和减少环境风险来最大化林分的产量。在东欧，黑松（Pinus contorta var。latifolia）可能被用作生物质和工业木材的来源。但是，在给出任何建议之前，应认真评估可能产生的新物种。在这项研究中，我们比较了第一代种子园的天然苏格兰松树（Pinus sylvestris）的结节木（VKN）的数量和比例以及外来的寄宿松树[尼尔森堡（58°38'N，122°41'W）和拉脱维亚中部生长的27岁的萨米特湖（54°24？N，122°37？W）]。我们还评估了VKN与几个形态计量学参数之间的关系。然而，Summit湖松木的种源在高度上超过了苏格兰松木，而纳尔逊堡的种源低于苏格兰松木。尽管苏格兰松的轮生性比黑松少了近两倍，但无结茎木的体积在两个物种之间没有显着差异。尽管相比于苏格兰松树，Summit Lake的Summit Lake种源更高。相反，VKN的比例在物种和出处之间均存在显着差异。苏格兰松树的VKN比例最低（约9％），而诺森堡的lodgepole松树源的VKN比例最高（〜14％）。因此，在红松种源中，Summit Lake似乎更适合生产工业木材。但是，预计会有更多的剩余材料。一些形态计量学参数与VKN和VKN的比例有关，但是这些关系在物种和出处之间是不同的。分支的总横截面是苏格兰松和and堡松纳尔逊堡种源的VKN的最佳预测指标，而茎直径与Summit Lake种源的相关性最大。活枝的轮生数和平均直径分别是黑松和苏格兰松的VKN比例的最佳预测指标。因此，形态学参数对于选择黑松的最佳树木可能是有用的。

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