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Greenhouse Gas Emissions from Agro-Ecosystems and Their Contribution to Environmental Change in the Indus Basin of Pakistan

机译:巴基斯坦印度河流域农业生态系统的温室气体排放及其对环境变化的贡献

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摘要

There is growing concern that increasing concentrations of greenhouse gases in the atmosphere have been responsible for global warming through their effect on radiation balance and temperature. The magnitude of emissions and the relative importance of different sources vary widely, regionally and locally. The Indus Basin of Pakistan is the food basket of the country and agricultural activities are vulnerable to the effects of global warming due to accelerated emissions of GHGs. Many developments have taken place in the agricultural sector of Pakistan in recent decades in the background of the changing role of the government and the encouragement of the private sector for investment in new ventures. These interventions have considerable GHG emission potential. Unfortunately, no published information is currently available on GHC concentrations in the Indus Basin to assess their magnitude and emission trends. The present study is an attempt to estimate GHG (CO2, CH4 and N2O) emissions arising from different agro-ecosystems of Indus Basin. The GHGs were estimated mostly using the IPCC Guidelines and data from the published literature. The results showed that CH4 emissions were the highest (4.126 Tg yr-1) followed by N2O (0.265 Tg yr-1) and CO2 (52.6 Tg yr-1). The sources of CH4 are enteric fermentation, rice cultivation and cultivation of other crops. N2O is formed by microbial denitrification of NO3 produced from applied fertilizer-N on cropped soils or by mineralization of native organic matter on fallow soils. CO2 is formed by the burning of plant residue and by soil respiration due to the decomposition of soil organic matter.
机译:人们越来越担心,大气中温室气体浓度的增加已通过其对辐射平衡和温度的影响而导致了全球变暖。排放量的大小和不同来源的相对重要性在地区,区域和地方差异很大。巴基斯坦的印度河盆地是该国的粮食篮子,由于温室气体排放的加速,农业活动容易受到全球变暖的影响。最近几十年来,在巴基斯坦政府角色不断变化以及鼓励私营部门投资新企业的背景下,巴基斯坦农业领域发生了许多发展。这些干预措施具有很大的温室气体排放潜力。不幸的是,目前尚无有关印度河流域GHC浓度的公开信息来评估其幅度和排放趋势。本研究试图估算印度河流域不同农业生态系统产生的温室气体(CO2,CH4和N2O)排放。温室气体大部分是根据《 IPCC指南》和已发表文献中的数据估算的。结果表明,CH4排放量最高(4.126 Tg yr-1),其次是N2O(0.265 Tg yr-1)和CO2(52.6 Tg yr-1)。 CH4的来源是肠发酵,水稻种植和其他农作物的种植。 N2O是通过在耕作土壤上对施用的肥料-N产生的NO3进行微生物反硝化或在休耕土壤上矿化天然有机物而形成的。 CO2由植物残渣燃烧和土壤有机质分解引起的土壤呼吸作用形成。

著录项

  • 来源
    《大气科学进展(英文版)》 |2008年第6期|1043-1052|共10页
  • 作者单位

    Global Change Impact Studies Centre ( GCISC), National Centre for Physics (NCP) Complex, Quaid-e-Azam University, P.O. QA U-45320, Islamabad, Pakistan;

    Global Change Impact Studies Centre ( GCISC), National Centre for Physics (NCP) Complex, Quaid-e-Azam University, P.O. QA U-45320, Islamabad, Pakistan;

  • 收录信息 中国科学引文数据库(CSCD);中国科技论文与引文数据库(CSTPCD);
  • 原文格式 PDF
  • 正文语种 chi
  • 中图分类 大气科学(气象学);
  • 关键词

    greenhouse gases; agriculture; Indus Basin; Pakistan;

    机译:温室气体;农业;印度河盆地;巴基斯坦;
  • 入库时间 2022-08-19 03:55:55
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