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首页> 外文期刊>Bioenergy research >Do Yield and Quality of Big Bluestem and Switchgrass Feedstock Decline over Winter?
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Do Yield and Quality of Big Bluestem and Switchgrass Feedstock Decline over Winter?

机译：冬季大蓝茎和柳枝Feed的产量和质量会下降吗？

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摘要

Switchgrass (Panicum virgatum L.) and big bluestem (Andropogon gerdardii Vitman) are potential perennial bioenergy feedstocks. Feedstock storage limitations, labor constraints for harvest, and environmental benefits provided by perennials are rationales for developing localized perennial feedstock as an alternative or in conjunction with annual feedstocks (i.e., crop residues). Little information is available on yield, mineral, and thermochemical properties of native species as related to harvest time. The study’s objectives were to compare the feedstock quantity and quality between grasses harvested in the fall or the following spring. It was hypothesized that biomass yield may decline, but translocation and/or leaching of minerals from the feedstock would improve feedstock quality. Feedstock yield did not differ by crop, harvest time, or their interactions. Both grasses averaged 6.0 Mg ha−1 (fall) and 5.4 Mg ha−1 (spring) with similar high heating value (17.7 MJ kg−1). The K/(Ca + Mg) ratio, used as a quality indicator declined to below a 0.5 threshold, but energy yield (Megajoule per kilogram) decreased 13 % by delaying harvest until spring. Only once during the four study-years were conditions ideal for early spring harvest, in contrast during another spring, very muddy conditions resulted in excessive soil contamination. Early spring harvest may be hampered by late snow, lodging, and muddy conditions that may delay or prevent harvest, and result in soil contamination of the feedstock. However, reducing slagging/fouling potential and the mass of mineral nutrients removed from the field without a dramatic loss in biomass or caloric content are reasons to delay harvest until spring.
机译：柳枝（（Panicum virgatum L.）和大蓝茎（Andropogon gerdardii Vitman）是潜在的多年生生物能源原料。多年生植物的原料储存限制，收获的劳动限制和环境效益是开发本地化多年生植物原料的替代品或与年生原料（即农作物残渣）结合的理由。与收获时间有关的关于本地物种的产量，矿物质和热化学性质的信息很少。该研究的目的是比较秋季或次年春季收获的草之间的原料数量和质量。假设生物量的产量可能下降，但是矿物质从矿物中的转移和/或浸出将改善原料的质量。原料产量没有因作物，收获时间或其相互作用而异。两种草的平均发热量高（17.7 MJ kg-1），平均为6.0 Mg ha-1（下降）和5.4 Mg ha-1（春天）。用作质量指标的K /（Ca + Mg）比降低到0.5阈值以下，但由于将收获推迟到春季，能量产量（每千克兆焦耳）降低了13％。在这四个研究年中，只有一次是春季早收的理想条件，相反，在另一个春季，非常泥泞的条件导致土壤过度污染。早春收成可能会因晚雪，倒伏和泥泞状况而受阻，这可能会延迟或阻止收获，并导致原料的土壤污染。但是，减少结渣/结垢的可能性以及从田间去除的矿质营养物质的量却不会显着降低生物量或热量的含量，是将收获推迟到春季的原因。

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