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首页> 外文期刊>The Science of the Total Environment >Productivity and carbon footprint of perennial grass-forage legume intercropping strategies with high or low nitrogen fertilizer input
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Productivity and carbon footprint of perennial grass-forage legume intercropping strategies with high or low nitrogen fertilizer input

机译：高氮或低氮肥料输入的多年生草料豆类间作策略的生产力和碳足迹

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摘要

A three-season field experiment was established and repeated twice with spring barley used as cover crop for different perennial grass-legume intercrops followed by a full year pasture cropping and winter wheat after sward incorporation. Two fertilization regimes were applied with plots fertilized with either a high or a low rate of mineral nitrogen (N) fertilizer. life cycle assessment (LCA) was used to evaluate the carbon footprint (global warming potential) of the grassland management including measured nitrous oxide (N_2O) emissions after sward incorporation.rnWithout applying any mineral N fertilizer, the forage legume pure stand, especially red clover, was able to produce about 15 t aboveground dry matter ha~(-1) year~(-1) saving around 325 kg mineral N fertilizer ha~(-1) compared to the cocksfoot and tall fescue grass treatments. The pure stand ryegrass yielded around 3 t DM more than red clover in the high fertilizer treatment. Nitrous oxide emissions were highest in the treatments containing legumes. The LCA showed that the low input N systems had markedly lower carbon footprint values than crops from the high N input system with the pure stand legumes without N fertilization having the lowest carbon footprint Thus, a reduction in N fertilizer application rates in the low input systems offsets increased N_2O emissions after forage legume treatments compared to grass plots due to the N fertilizer production-related emissions. When including the subsequent wheat yield in the total aboveground production across the three-season rotation, the pure stand red clover without N application and pure stand ryegrass treatments with the highest N input equalled. The present study illustrate how leguminous biological nitrogen fixation (BNF) represents an important low impact renewable N source without reducing crop yields and thereby fanners earnings.
机译：建立了一个为期三季的田间试验，并重复了两次，用春大麦作为不同多年生草豆类作物间作的覆盖作物，然后整年放牧并掺入草皮后冬小麦。对以高或低矿质氮（N）肥料施肥的地块施以两种施肥方案。生命周期评估（LCA）用于评估草地管理中碳的足迹（全球变暖潜能），包括在掺入草皮后测得的一氧化二氮（N_2O）排放。不使用任何矿物N肥料，饲草豆类纯林，尤其是红三叶草与the脚草和高羊茅草相比，可生产约15吨地上干物质ha〜（-1）年〜（-1），节省了约325 kg矿物氮肥ha〜（-1）。在高肥处理中，纯林分黑麦草的产量比红三叶草高约3 t DM。一氧化二氮的排放量在含有豆类的处理中最高。 LCA表明，低氮输入系统的碳足迹值明显高于高氮输入系统的农作物，其中纯豆科植物没有氮肥而碳足迹最低，因此，低氮输入系统的氮肥施用量减少与草料田相比，由于与肥料生产相关的氮排放，抵消了草料豆科植物处理后N_2O排放的增加。如果在整个三季轮换中将随后的小麦产量计入地上总产量中，则不施氮的纯林分红三叶草和施氮量最高的纯林分黑麦草处理相等。本研究说明了豆科生物固氮（BNF）如何在不降低作物单产的情况下代表一种重要的低影响力可再生氮源，从而不会增加农民的收入。

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  • 来源
    《The Science of the Total Environment》 |2016年第15期|1339-1347|共9页
  • 作者

    Henrik Hauggaard-Nielsen; Petra Lachouani; Marie Trydeman Knudsen; Per Ambus; Birte Boelt; Rene Gislum;

  • 作者单位

    Department of Chemical and Biochemical Engineering, Technical University of Denmark, Kgs. Lyngby, Denmark,Department of Environmental, Social and Spatial Change, Roskilde University, Denmark;

    Department of Chemical and Biochemical Engineering, Technical University of Denmark, Kgs. Lyngby, Denmark,Department of Geosciences and Natural Resource Management, University of Copenhagen, Denmark;

    Department of Agroecology, Aarhus University, Denmark;

    Department of Chemical and Biochemical Engineering, Technical University of Denmark, Kgs. Lyngby, Denmark,Department of Geosciences and Natural Resource Management, University of Copenhagen, Denmark;

    Department of Agroecology, Aarhus University, Denmark;

    Department of Agroecology, Aarhus University, Denmark;

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  • 正文语种 eng
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  • 关键词

    Nitrogen fixation; Nitrous oxide; LCA; Global warming potential; Subsequent crop;

    机译：固氮笑气;LCA;全球变暖的潜力;后续作物;

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