首页> 外文会议>Ecosystems and Sustainable Development IV >Developments in the nitrogen surplus and the fossil energy use in Danish agriculture during the 20th century
【24h】

Developments in the nitrogen surplus and the fossil energy use in Danish agriculture during the 20th century

机译:20世纪丹麦农业中氮剩余量和化石能源利用的发展

获取原文

摘要

This paper goes through the development in nitrogen imports, nitrogen exports, nitrogen surplus, and fossil energy use in Danish agriculture during the 20th century. The nitrogen export in the form of animal and vegetable products rose throughout the century. Until around 1950, atmospheric N derived by leguminous crops was the dominant nitrogen import, but then N fertilisers became dominant. Since 1983, the fertiliser import and the nitrogen surplus have dropped, and nitrogen imported in the form of concentrate fodders now equals the amount imported in the form of fertilisers. The fossil energy use generally follows the fertiliser use and, like the nitrogen surplus, has been in a continuous decline since the mid-eighties after an almost exponential growth period from 1945-1970. On the basis of the nitrogen and energy accounts, the sustainability of the present development and the potential for future sustainable development are discussed. As a tool to structure this discussion, the development is divided into characteristic phases, where the lessons for each phase, regarding sustainable development, are derived and discussed according to the parallel historical developments during the 20th century.
机译:本文探讨了20世纪丹麦农业中氮的进口,氮的出口,氮的过剩和化石能源的使用发展。动植物产品形式的氮出口在整个世纪中都在增加。直到1950年左右,豆类作物产生的大气氮是氮的主要输入源,但随后氮肥开始占主导地位。自1983年以来,肥料的进口和氮的过剩下降了,现在以精饲料的形式进口的氮等于以肥料的形式进口的氮。化石能源的使用通常跟随化肥的使用,并且像氮肥一样,自八十年代中期以来经历了从1945年至1970年几乎成指数增长后的持续下降。根据氮和能源的账目,讨论了当前发展的可持续性和未来可持续发展的潜力。作为构建此讨论的工具,发展被划分为特征阶段,其中根据20世纪平行的历史发展,导出并讨论了有关可持续发展的每个阶段的经验教训。

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