...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Indirect land-use changes can overcome carbon savings from biofuels in Brazil
【24h】

Indirect land-use changes can overcome carbon savings from biofuels in Brazil

机译：间接的土地利用变化可以克服巴西生物燃料带来的碳节省

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The planned expansion of biofuel plantations in Brazil could potentially cause both direct and indirect land-use changes (e.g., biofuel plantations replace rangelands, which replace forests). In this study, we use a spatially explicit model to project land-use changes caused by that expansion in 2020, assuming that ethanol (biodiesel) production increases by 35 (4) × 10~9 liter in the 2003-2020 period. Our simulations show that direct land-use changes will have a small impact on carbon emissions because most biofuel plantations would replace rangeland areas. However, indirect land-use changes, especially those pushing the rangeland frontier into the Amazonian forests, could offset the carbon savings from biofuels. Sugarcane ethanol and soybean biodiesel each contribute to nearly half of the projected indirect deforestation of 121,970 km~2 by 2020, creating a carbon debt that would take about 250 years to be repaid using these biofuels instead of fossil fuels. We also tested different crops that could serve as feedstock to fulfill Brazil's biodiesel demand and found that oil palm would cause the least land-use changes and associated carbon debt. The modeled livestock density increases by 0.09 head per hectare. But a higher increase of 0.13 head per hectare in the average livestock density throughout the country could avoid the indirect land-use changes caused by biofuels (even with soybean as the biodiesel feedstock), while still fulfilling all food and bioenergy demands. We suggest that a closer collaboration or strengthened institutional link between the biofuel and cattle-ranching sectors in the coming years is crucial for effective carbon savings from biofuels in Brazil.
机译：巴西计划扩建的生物燃料种植园可能会引起直接和间接的土地利用变化（例如，生物燃料种植园取代牧场，从而取代森林）。在这项研究中，我们使用空间显式模型来预测由2020年的扩张引起的土地利用变化，假设乙醇（生物柴油）的生产在2003-2020年期间增加了35（4）×10〜9升。我们的模拟表明，直接的土地利用变化将对碳排放产生很小的影响，因为大多数生物燃料种植园将取代牧场地区。但是，间接的土地利用变化，尤其是那些将牧场边界推入亚马逊森林的变化，可能会抵消生物燃料所节省的碳。到2020年，甘蔗乙醇和大豆生物柴油各自占121,970 km〜2预计间接砍伐森林的近一半，使用这些生物燃料代替化石燃料将产生大约250年的碳债务偿还。我们还测试了可以用作原料以满足巴西生物柴油需求的不同农作物，并发现油棕将引起最少的土地用途变化和相关的碳债务。建模的牲畜密度每公顷增加0.09头。但是，全国平均牲畜密度每公顷增加0.13头，可以避免由生物燃料（即使以大豆作为生物柴油原料）引起的间接土地利用变化，同时仍能满足所有粮食和生物能源需求。我们建议，在未来几年中，生物燃料与养牛业之间更紧密的合作或加强机构联系对于巴西有效利用生物燃料节省碳至关重要。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号