A Worldwide Assessment of Greenhouse Gas Emissions from Drained Organic Soils
A Worldwide Assessment of Greenhouse Gas Emissions from Drained Organic Soils
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DOI：
10.3390/su8040371
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发表时间：
2016-04-01
期刊：
影响因子：
3.9
通讯作者：
Conchedda, Giulia
中科院分区：
文献类型：
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作者：
Tubiello, Francesco Nicola;Biancalani, Riccardo;Conchedda, Giulia
尽管包括泥炭地在内的有机土壤在全球碳循环中很重要，但有关区域和全球排放的详细信息却很少。这是因为很难绘制、测量和评估土地、土壤和水相互作用的复杂动态，这是评估人为驱动的有机土壤退化所需的。我们提出了一种新的方法，用于农业有机土壤排水的综合评估和相关温室气体排放的估计。结果表明，全世界有超过2500万公顷的有机土壤被排出用于农业用途，其中约60%位于北方和温带凉爽地区，34%位于热带地区，5%位于暖温带地区。排水排放的总排放量在全球范围内都很大，每年总计近10亿吨CO(2)eq。其中，二氧化碳成分约为7.8亿吨，占农业、林业和土地利用净二氧化碳排放总量的四分之一以上。这些排放中的大部分来自东南亚的几个热带国家，并与土地清理和农作物种植排水有关。与这项工作有关的地理空间数据是通过粮农组织地理空间服务器GeoNetwork传播的，而国家汇总统计数据是通过FAOSTAT数据库传播的。
Despite the importance of organic soils, including peatlands, in the global carbon cycle, detailed information on regional and global emissions is scarce. This is due to the difficulty to map, measure, and assess the complex dynamics of land, soil, and water interactions needed to assess the human-driven degradation of organic soils. We produced a new methodology for the comprehensive assessment of drained organic soils in agriculture and the estimation of the associated greenhouse gas emissions. Results indicated that over 25 million hectares of organic soils were drained worldwide for agriculture use, of which about 60% were in boreal and temperate cool areas, 34% in tropical areas, and 5% in warm temperate areas. Total emissions from the drainage were globally significant, totaling nearly one billion tonnes CO(2)eq annually. Of this, the CO2 component, about 780 million tonnes, represented more than one-fourth of total net CO2 emissions from agriculture, forestry, and land use. The bulk of these emissions came from a few tropical countries in Southeast Asia, and was linked to land clearing and drainage for crop cultivation. Geospatial data relative to this work were disseminated via the FAO geospatial server GeoNetwork, while the national aggregated statistics were disseminated via the FAOSTAT database.