Fast-growing tree species will be an important tool in the future production of renewables and in substituting non-renewable fossil energy sources. Sweden, like other countries around the Baltic Sea, has large areas of abandoned farmland usable for biomass production, but knowledge of growth performance of tree species candidates is insufficient. An experiment was initiated where six potentially high-producing tree species were compared. The best available plant material for each species was used on five sites over latitudes 56–64°N in Sweden. Results from the first 8–9 years are reported. Short rotation coppice willow (Salix schwerinii Wolf × S. viminalis L., clone ‘Tora’) had the fastest initial growth and production in southern Sweden. Hybrid aspen (Populus tremula L. × P. tremuloides Michx.) and poplar (Populus spp., section Tacamahaca), grown as short rotation forest, grew well over all sites and showed the highest productivity at the two northern sites. Hybrid larch (Larix ×eurolepis Henry) displayed a high potential at the two most southerly sites, whilst silver birch (Betula pendula Roth) was a medium-producing species at all sites. Norway spruce (Picea abies (L.) Karst.) started slowly, and Siberian larch (L. sukaczewii Dylis) produced poorly at the two northern sites in the initial stage. All tree species followed existing height development curves for the respective species on a high site quality level. Currently, well-growing clones of Populus spp. indicated that a wider selection of tree species can be used at high latitudes under climate change. The study showed a high growth potential for most species on former agricultural lands. However, measures to reduce climate and biological damage must be included in future efforts.

中文翻译：

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瑞典沿横断面的农田上不同树种的早期生长

速生树种将成为未来可再生能源生产和替代不可再生化石能源的重要工具。像波罗的海周围的其他国家一样，瑞典拥有大量可用于生物质生产的废弃农田，但是对候选树种生长性能的了解不足。开始了一项实验，比较了六个潜在的高产树种。在瑞典，北纬56-64°N的五个地点都使用了每种物种的最佳植物材料。报告前8–9年的结果。短轮伐木柳（Salix schwerinii Wolf× S. viminalis L.，克隆“ Tora”）在瑞典南部的初始生长和产量最快。杂种白杨（欧洲山杨L.× P. tremuloides Michx。）和杨树（Populus spp。，Tacamahaca节），生长为短轮伐林，在所有地点生长良好，在北部两个地点表现出最高的生产力。杂种落叶松（Larix × eurolepis Henry）在两个最南端的地点显示出很高的潜力，而白桦（Betula pendula Roth）在所有地点都是中等产种。挪威云杉（Picea abies（L.）Karst。）起步缓慢，西伯利亚落叶松（L. sukaczewii最初阶段，戴利斯（Dylis）的产量在北部的两个地点都很差。所有树种均在较高的场地质量水平上遵循相应树种的现有高度发展曲线。当前，生长良好的胡杨属植物的克隆。指出在气候变化下高纬度地区可以使用更多种类的树种。研究表明，在以前的农业用地上，大多数物种具有很高的生长潜力。但是，今后的工作必须包括减少气候和生物破坏的措施。