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首页> 外文期刊>Bioenergy research >Intensive Utilization of Harvest Residues in Southern Pine Plantations: Quantities Available and Implications for Nutrient Budgets and Sustainable Site Productivity
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Intensive Utilization of Harvest Residues in Southern Pine Plantations: Quantities Available and Implications for Nutrient Budgets and Sustainable Site Productivity

机译：集约化利用南方松人工林的收成残渣：可用数量及其对营养预算和可持续土地生产力的影响

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The rising costs and social concerns over fossil fuels have resulted in increased interest in and opportunities for biofuels. Biomass in the form of coarse woody residues remaining after traditional timber harvest in the southeastern USA is a potentially significant source of biomass for bioenergy. Questions remain regarding whether the removal of this material would constitute a sustainable silvicultural practice given the potential impact on soil nutrient cycling and other ecosystem functions. Our objective is to review existing studies to estimate quantities of residual materials on southern pine forests that may be available, potential nutrient removals, and potential replacement with fertilizer. Regionally, it is estimated that 32 million Mg year~(-1) of dry harvest residues may be available as a feedstock. At the stand level, between 50 and 85 Mg ha~(-1) of material is left on site after typical stem-only harvests, of which half could be removed using chippers at the landing. Based on these estimates, increase in midrotation fertilization rates of 45% to 60% may be needed on some sites to fully replace the nutrients from harvesting residues removed for bioenergy. Field experiments suggest that residue removals do not degrade forest productivity in many cases, but more data are needed to assess the effects of frequent removals (i.e.,rnfrom short-rotation systems) over longer periods and identify sites that may be particularly sensitive to the practice. A benefit of developing markets for previously nonmerchantable materials may create incentives for improved forest management by landowners.
机译：有关化石燃料的成本上涨和社会关注导致对生物燃料的兴趣和机会增加。在美国东南部进行传统木材采伐后，残留的粗木质残留物形式的生物质是潜在的重要生物能源。考虑到对土壤养分循环和其他生态系统功能的潜在影响，去除这种材料是否构成可持续的营林实践仍存在疑问。我们的目标是审查现有研究，以估算可能存在的南部松树林中的残留物质数量，潜在的养分去除以及潜在的肥料替代。从地区上看，每年可收获3200万Mg（-1）的干燥收获残余物作为原料。在典型的单茎收割之后，在林分水平上，将有50至85 Mg ha-1的材料留在现场，其中一半可以用平台上的削片机去除。根据这些估计，某些地方可能需要将中耕施肥率提高45％至60％，以完全替代为生物能源而去除的收获残余物中的营养。田间试验表明，在许多情况下，残留物的清除不会降低森林的生产力，但是需要更多的数据来评估频繁清除（例如，短轮伐期系统）在较长时期内的影响，并确定可能对这种做法特别敏感的地点。 。开发以前不可销售的材料的市场所带来的好处可能会刺激土地所有者改善森林管理。

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