Abstract Biochar is charred material formed by the pyrolysis of organic matter. The addition of biochar to soil may offer a chance to mitigate climate change by increasing soil carbon stocks, improving soil fertility and enhancing plant growth. Vast majority of biochar studies are conducted in agricultural soils, and field experiments studying the effect of biochar on tree growth in boreal forests are lacking. We applied spruce biochar amendments of 5 and 10 Mg ha−1 to the soil surface in young boreal Scots pine (Pinus sylvestris L.) forests in Southern Finland and studied the responses in tree growth and needle nitrogen (N) and 15N concentrations during the first three years after treatment. The biochar amendment of 10 Mg ha−1 increased the diameter growth of dominant trees significantly, on average by 1 mm year−1, which corresponded to 25% increase compared to control during the three years study period. The positive growth responses were less pronounced in height than in diameter growth. The biochar amendment of 5 Mg ha−1 increased the height growth of dominant trees by 0.16 m or 12% compared to the control during three years. Biochar amendments did not affect N and 15N concentrations in needles. The results suggest that wood biochar amendment can be a climate-friendly method to increase tree biomass production in nutrient poor, xeric, young Scots pine forests.

中文翻译：

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Biochar 修正剂促进了芬兰营养贫乏的年轻苏格兰松林的树木生长

摘要 生物炭是有机物热解形成的炭化物质。在土壤中添加生物炭可能会通过增加土壤碳储量、提高土壤肥力和促进植物生长来缓解气候变化。绝大多数生物炭研究是在农业土壤中进行的，缺乏研究生物炭对北方森林树木生长影响的田间试验。我们将 5 和 10 Mg ha-1 的云杉生物炭修正剂应用于芬兰南部年轻的北方苏格兰松 (Pinus sylvestris L.) 森林的土壤表面，并研究了树木生长和针状氮 (N) 和 15N 浓度的响应。治疗后的前三年。10 Mg ha-1 的生物炭改良剂显着增加了优势树的直径增长，平均每年增加 1 毫米-1，在三年的研究期间，与对照相比增加了 25%。与直径增长相比，高度的积极增长反应不那么明显。在三年内，与对照相比，5 Mg ha-1 的生物炭改良剂使优势树的高度增长增加了 0.16 m 或 12%。Biochar 修正不影响针中的 N 和 15N 浓度。结果表明，木材生物炭改良剂可以是一种气候友好的方法，可在营养贫乏、干旱、年轻的苏格兰松林中增加树木生物量产量。Biochar 修正不影响针中的 N 和 15N 浓度。结果表明，木材生物炭改良剂可以成为一种气候友好的方法，可以在营养贫乏、干旱、年轻的苏格兰松林中增加树木生物量产量。Biochar 修正不影响针中的 N 和 15N 浓度。结果表明，木材生物炭改良剂可以是一种气候友好的方法，可在营养贫乏、干旱、年轻的苏格兰松林中增加树木生物量产量。