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Efficient Methods of Estimating Switchgrass Biomass Supplies

机译:估算柳枝Bio生物量供应的有效方法

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摘要

Switchgrass (Panicum virgatum L.) is being developed as a biofuel feedstock for the United States. Efficient and accurate methods to estimate switchgrass biomass feedstock supply within a production area will be required by biorefineries. Our main objective was to determine the effectiveness of indirect methods for estimating biomass yields and composition of switchgrass fields. Indirect measurements were conducted in eastern Nebraska from 2003 to 2007 in which switchgrass biomass yields were manipulated using three nitrogen rates (0 kg N ha~(-1), 60 kg N ha~(-1), and 120 kg N ha~(-1)) and two harvest periods (August and post-killing frost). A modified Robel pole was used to determine visual obstruction, elongated leaf height, and canopy height measurements. Prediction models from the study showed that elongated leaf height, visual obstruction, and canopy height measurements accounted for >91%, >90%, and >82% of the variation in switchgrassrnbiomass, respectively. Regression slopes were similar by cultivar ("Cave-in-Rock" and "Trailblazer"), harvest period, and across years indicating that a single model is applicable for determining biomass feedstock supply within a region, assuming similar harvesting methods. Sample numbers required to receive the same level of precision were as follows: elongated leaf height
机译:柳枝((Panicum virgatum L.)正被开发为美国的生物燃料原料。生物精炼厂将需要一种高效,准确的方法来估算生产区内的柳枝biomass生物质原料供应。我们的主要目的是确定间接方法估算柳枝fields生物量产量和组成的有效性。内布拉斯加州东部从2003年至2007年进行了间接测量,其中使用3个氮素比率(0 kg N ha〜(-1),60 kg N ha〜(-1)和120 kg N ha〜( -1))和两个收获期(八月和杀伤后霜冻)。修改后的Robel杆用于确定视觉障碍,拉长的叶子高度和冠层高度测量值。该研究的预测模型表明,延长的叶片高度,视觉障碍和冠层高度的测量分别占柳枝switch生物量变化的> 91%,> 90%和> 82%。品种(“洞穴中的洞穴”和“开拓者”),收获期和多年间的回归斜率相似,表明假设采用相似的收获方法,则单个模型可用于确定区域内的生物质原料供应。达到相同精确度所需的样本数量如下:细长叶片高度<冠层高度<视觉障碍。在田间测量20至30个伸长的叶高可以预测柳枝biomass的生物量产量在平均值的10%以内,置信度为95%。建议在低到不同林分密度的柳枝fields田上进行视觉障碍,而在高和均匀林分密度的柳枝fields上建议进行长叶高度测量。将眼用设备与Robel杆结合使用,可以在田间规模上对柳枝,、阔叶杂草和草类杂草进行合理的频率估算。

著录项

  • 来源
    《Bioenergy research》 |2010年第3期|p.243-250|共8页
  • 作者单位

    USDA-ARS, Northern Great Plains Research Laboratory, P.O. Box 459, Mandan, ND 58554, USA;

    rnUSDA-ARS, Grain, Forage, and Bioenergy Research Unit, University of Nebraska, P.O. Box 830737, Lincoln, NE 68583, USA;

    rnUSDA-ARS, Grain, Forage, and Bioenergy Research Unit, University of Nebraska, P.O. Box 830737, Lincoln, NE 68583, USA;

    rnDepartment of Agronomy and Horticulture, University of Nebraska-Lincoln, 377L Plant Science Hall, Lincoln, NE 68583-0915, USA;

    rnDepartment of Statistics, University of Nebraska-Lincoln, 340 Hardin Hall North, Lincoln, NE 68583-0963, USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    bioenergy; indirect measurement; sward height; switchgrass; visual obstruction;

    机译:生物能源间接测量草地高度柳枝;视觉障碍;

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