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首页> 外文期刊>Bioenergy research >Modeled Impacts of Cover Crops and Vegetative Barriers on Corn Stover Availability and Soil Quality
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Modeled Impacts of Cover Crops and Vegetative Barriers on Corn Stover Availability and Soil Quality

机译：覆盖作物和营养屏障对玉米秸秆可用性和土壤质量的模拟影响

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Environmentally benign, economically viable, and socially acceptable agronomic strategies are needed to launch a sustainable lignocellulosic biofuel industry. Our objective was to demonstrate a landscape planning process that can ensure adequate supplies of corn (Zea mays L.) stover feedstock while protecting and improving soil quality. The Landscape Environmental Assessment Framework (LEAF) was used to develop land use strategies that were then scaled up for five U.S. Corn Belt states (Nebraska, Iowa, Illinois, Indiana, and Minnesota) to illustrate the impact that could be achieved. Our results show an annual sustainable stover supply of 194 million Mg without exceeding soil erosion T values or depleting soil organic carbon [i.e., soil conditioning index (SCI) > 0] when no-till, winter cover crop, and vegetative barriers were incorporated into the landscape. A second, more rigorous conservation target was set to enhance soil quality while sustainably harvesting stover. By requiring erosion to be <1/2 T and the SCI-organic matter (OM) subfactor to be > 0, the annual sustainable quantity of harvestable stover dropped to148 million Mg. Examining removal rates by state and soil resource showed that soil capability class and slope generally determined the effectiveness of the three conservation practices and the resulting sustainable harvest rate. This emphasizes that sustainable biomass harvest must be based on subfield management decisions to ensure soil resources are conserved or enhanced, while providing sufficient biomass feedstock to support the economic growth of bioenergy enterprises.
机译：为了启动可持续的木质纤维素生物燃料产业，需要环境友好，经济可行和社会可接受的农艺策略。我们的目标是演示一种景观规划流程，该流程可以确保充足的玉米（Zea mays L.）秸秆原料，同时保护和改善土壤质量。景观环境评估框架（LEAF）用于制定土地使用策略，然后将其扩展到美国五个玉米带州（内布拉斯加州，爱荷华州，伊利诺伊州，印第安纳州和明尼苏达州）以说明可以实现的影响。我们的结果显示，当将免耕，冬季覆盖作物和植物性屏障纳入其中时，每年可持续提供的秸秆供应量为1.94亿毫克，而不会超过土壤侵蚀T值或消耗土壤有机碳[即，土壤调节指数（SCI）> 0]景观。第二个更严格的保护目标是提高土壤质量，同时可持续收获秸秆。通过要求侵蚀<1/2 T且SCI-有机物（OM）子因子> 0，可收获秸秆的年度可持续量下降到1.48亿镁。通过州和土壤资源的清除率检查表明，土壤能力等级和坡度通常决定了三种保护措施的有效性以及由此产生的可持续收成率。这强调了可持续的生物量收获必须基于子领域管理决策，以确保土壤资源得到保护或增加，同时提供足够的生物量原料以支持生物能源企业的经济增长。

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