Current and potential sustainable corn stover feedstock for biofuel production in the United States
Current and potential sustainable corn stover feedstock for biofuel production in the United States
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DOI：
10.1016/j.biombioe.2012.09.022
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发表时间：
2012-12
影响因子：
6
通讯作者：
Z. Tan;Shuguang Liu;N. Bliss;L. Tieszen
中科院分区：
文献类型：
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作者：
Z. Tan;Shuguang Liu;N. Bliss;L. Tieszen
玉米（Zea mays L.）秸秆作为纤维素乙醇的原料引起了对农业可持续性的关注。过度收割玉米秸秆可能对土壤质量产生长期影响。我们估计了当前和未来的秸秆产量，并通过定义与当前土壤有机碳（SOC）含量、耕作方法和轮作制度相关的最低秸秆要求（MSR），评估了美国可用于生物燃料原料的潜在可收获秸秆量（HSA）。在这里，我们表明，目前的HSA的幅度是有限的（31 Tg y−1，干物质），由于高的MSR保持目前的SOC含量水平的土壤，具有高的碳含量。对于SOC含量中等的土壤，MSR的另一种定义可以显着提高每年的HSA到68.7 Tg，甚至到132.2 Tg，如果计算当前施用的粪肥量以部分抵消MSR。未来，秸秆原料的更大潜力可能来自秸秆产量、面积收获指数和/或总种植面积的增加。这些结果表明，应设计进一步的田间试验MSR确定MSR幅度之间的差异保持SOC含量和防止土壤侵蚀，并了解当前SOC含量水平的作用，确定MSR从土壤中具有广泛的碳含量和气候条件。
Increased demand for corn (Zea mays L.) stover as a feedstock for cellulosic ethanol raises concerns about agricultural sustainability. Excessive corn stover harvesting could have long-term impacts on soil quality. We estimated current and future stover production and evaluated the potential harvestable stover amount (HSA) that could be used for biofuel feedstock in the United States by defining the minimum stover requirement (MSR) associated with the current soil organic carbon (SOC) content, tillage practices, and crop rotation systems. Here we show that the magnitude of the current HSA is limited (31 Tg y−1, dry matter) due to the high MSR for maintaining the current SOC content levels of soils that have a high carbon content. An alternative definition of MSR for soils with a moderate level of SOC content could significantly elevate the annual HSA to 68.7 Tg, or even to 132.2 Tg if the amount of currently applied manure is counted to partially offset the MSR. In the future, a greater potential for stover feedstock could come from an increase in stover yield, areal harvest index, and/or the total planted area. These results suggest that further field experiments on MSR should be designed to identify differences in MSR magnitude between maintaining SOC content and preventing soil erosion, and to understand the role of current SOC content level in determining MSR from soils with a wide range of carbon contents and climatic conditions.