Canada has a quarter of the world's peatlands accounting for an estimated 150 Gt of stored carbon. While over 98% of Canadian peatlands are intact, agriculture has been estimated as accounting for the greatest peatland disturbance by area. Greenhouse gas (GHG) emissions from peatland agriculture can contribute a large proportion of national anthropogenic emissions for some countries. In Canada, estimates of GHG emissions from cultivated peat soils are incomplete. Improved accounting of these GHG emissions is required to inform decisions about where to deploy ecological restoration projects and where to allow future agricultural expansion as climate warms. Compiled studies that measured GHG fluxes from agricultural peat fields in Canada resulted in mean emissions factors of 5.1 t CO2e ha−1 year−1, −0.12 kg CH4 ha−1 year−1, and 14.3 kg N2O‐N ha−1 year−1 for carbon dioxide, methane, and nitrous oxide, respectively. Combining these values with a compilation of estimates of agricultural peatland disturbance area in Canada, GHG emissions estimates in Canada arising from peatland converted to agriculture remain highly uncertain, ranging from 1.4 to 35 Mt CO2e year−1, with a median value near 18 Mt CO2e year−1. The largest contributor to this wide range of estimates is uncertainty peatland area affected, indicating an urgent need to improving mapping of organic soils under agriculture in Canada. To help guide decision‐making in Canada, we recommend a network of research stations across a range of agricultural management intensities and climate regions for monitoring hydrological conditions and GHG exchange on organic soils affected by agriculture.

中文翻译：

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加拿大农业泥炭地温室气体排放的首次评估：气候变化减缓潜力评估


加拿大拥有世界四分之一的泥炭地，估计储存了 150 Gt 的碳。虽然超过 98% 的加拿大泥炭地完好无损，但据估计，农业是按面积划分的泥炭地干扰最大的原因。对于一些国家来说，泥炭地农业的温室气体 （GHG） 排放可能占全国人为排放的很大一部分。在加拿大，对耕作泥炭土的温室气体排放量的估计是不完整的。需要改进对这些温室气体排放的核算，以便为在何处部署生态恢复项目以及在何处允许未来农业扩张的决策提供信息。测量加拿大农业泥炭田温室气体通量的研究汇编结果显示，二氧化碳、甲烷和一氧化二氮的平均排放因子分别为 5.1 吨二氧化碳当量公顷-1 年-1、-0.12 公斤 CH4 公顷-1 年-1 和 14.3 公斤 N2O-N ha-1 年-1。将这些值与加拿大农业泥炭地干扰面积估计的汇编相结合，加拿大泥炭地转为农业产生的温室气体排放估计仍然高度不确定，范围从 1.4 到 35 公吨二氧化碳当量年-1，中位数接近 18 公吨二氧化碳当量年-1。造成如此广泛估计的最大因素是受影响的泥炭地面积的不确定性，这表明迫切需要改进加拿大农业有机土壤的绘图。为了帮助指导加拿大的决策，我们建议在一系列农业管理强度和气候区域建立研究站网络，以监测受农业影响的有机土壤的水文条件和温室气体交换。