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首页> 外文期刊>Plant and Soil >Effectiveness of wood ash containing charcoal as a fertilizer for a forest plantation in a temperate region
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Effectiveness of wood ash containing charcoal as a fertilizer for a forest plantation in a temperate region

机译：含木炭的木灰作为温带地区人工林肥料的功效

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Amendment of forest soils with mixed wood ash (MWA) generated in biomass power plants can prevent the depletion of soil nutrients that results from the intensive harvesting of forest plantations. Unlike fly wood ash, MWA contains charcoal and is characterized by a lower release of nutrients, so that it might be useful as a long term source of nutrients and soil organic matter. However, in order to use MWA as a fertilizer in forest systems, its effectiveness as regards supplying P and N must be improved. These aspects were studied in a 4 year-trial carried out in a Pinus radiata plantation. MWA was added alone or with mineral P, and the results were compared with those obtained with a combination of Ca(OH)2 and mineral P. The application of MWA together with mineral P fertilizer increased the nutrient supply to the trees, as revealed by the changes in nutrient concentrations, lower values of resorption efficiencies and improved tree growth. The results showed that the amounts of Ca, Mg and K supplied by the MWA were suitable for maintenance of soil reserves. However, the presence of charcoal may have decreased the availability of P. The application of the MWA led to lower soil N mineralization rates and mineral N concentrations, which may affect N-limited systems. The use of density-dependent single tree increment models enabled the positive effects on tree growth of fertilization and thinning to be distinguished. For the treatments supplemented with mineral P, multiplicative factors of 1.13 to 1.15 can be applied to obtain post-thinning predictions of 4-year single-tree basal area increments. Although MWA can be used as a long term source of nutrients, charcoal temporarily reduces the availability of P and N.
机译：用生物质能发电厂产生的混合木灰（MWA）修正森林土壤可以防止由于森林人工集约化收获而造成的土壤养分消耗。与粉煤灰不同，MWA含有木炭，其特征在于养分释放较少，因此它可能长期用作养分和土壤有机质的来源。但是，为了在森林系统中使用MWA作为肥料，必须提高其在供应P和N方面的有效性。在辐射松人工林进行的4年试验中研究了这些方面。将MWA单独或与矿物P一起添加，并将其结果与Ca（OH）2 和矿物P的组合所获得的结果进行比较。MWA与矿物P肥料的结合使用可增加树木的养分供应如养分浓度的变化，较低的吸收效率值和改善的树木生长所揭示。结果表明，MWA提供的Ca，Mg和K量适合维持土壤储量。但是，木炭的存在可能会降低磷的利用率。MWA的施用导致较低的土壤氮矿化速率和矿物质氮浓度，这可能会影响有限氮系统。依赖密度的单棵树增量模型的使用使对施肥和间伐树木生长的积极影响得以区分​​。对于补充矿物质P的处理，可以应用1.13至1.15的乘数因子来获得4年单树基础面积增加的稀疏预测。尽管MWA可以用作长期营养物，但木炭会暂时减少P和N的利用率。

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