Silverthorn Teresa, Audet Joachim, Evans Chris D, van der Knaap Judith, Kosten Sarian, Paranaíba José, Struik Quinten, Webb Jackie, Wu Wenxin, Yan Zhifeng, Peacock Mike
Department of Geography and Planning, School of Environmental Sciences, University of Liverpool, Liverpool, UK.
Department of Ecoscience, Aarhus University, Aarhus, Denmark.
Glob Chang Biol. 2025 Mar;31(3):e70079. doi: 10.1111/gcb.70079.
Ditches and canals are omitted from global budgets of inland water emissions, despite research showing them to be emitters of greenhouse gases (GHGs). Here, we synthesize data across climate zones and land use types to show, for the first time, that global ditches emit notable amounts of carbon dioxide (CO) and nitrous oxide (NO). Ditches had higher per-area emissions of CO and NO than ponds, lakes, and reservoirs, likely due to high nutrient inputs. Preliminary upscaling showed that the inclusion of ditches would increase global inland water CO emissions by 0.6%-1% and NO emissions by 3%-9%. Trophic state and climate influenced NO emissions, while CO emissions had complex drivers difficult to disentangle at the global scale. This research highlights the importance of including ditches in global inland water GHG budgets and informs more accurate reporting of anthropogenic emissions in national inventories.
尽管有研究表明沟渠是温室气体排放源，但内陆水体排放的全球预算中却未将其纳入。在此，我们综合了不同气候区和土地利用类型的数据，首次表明全球沟渠会排放大量的二氧化碳（CO）和一氧化二氮（N₂O）。沟渠每单位面积的CO和N₂O排放量高于池塘、湖泊和水库，这可能是由于养分输入量大。初步的尺度放大分析表明，将沟渠纳入计算会使全球内陆水体的CO排放量增加0.6% - 1%，N₂O排放量增加3% - 9%。营养状态和气候影响N₂O排放，而CO排放的驱动因素复杂，在全球尺度上难以厘清。这项研究凸显了将沟渠纳入全球内陆水体温室气体预算的重要性，并为国家清单中更准确地报告人为排放提供了依据。
