Rivers are known to emit large amounts of greenhouse gases globally, however, few studies have evaluated the interacting influence of land use, within river features (for example, sites of major confluence, changes in shape), and hydrology on the coupled dynamics of carbon dioxide (CO₂), methane (CH₄) and nitrous oxide (N₂O). Here, we measured CO₂, CH₄ and N₂O concentrations and fluxes at 15 sites along a 146.6 km stretch of the main stem of a large north temperate river: the Rivière du Nord, which experiences an abrupt change in geology and land use and winter ice cover. Each site along the river was sampled once per season, at targeted low flow and high flow moments, for three consecutive years. Overall, highest concentrations of all gases were found in the lower reaches where urban and agricultural activity are most intensive. CO₂ and N₂O were highest overall under ice during winter, whereas CH₄ was highest during summer. The river was always supersaturated in CH₄ whereas surface water was occasionally undersaturated in N₂O and CO₂, particularly during the summer low flow period in pristine upper reaches. Spatial variability was, however, minimized during periods of high flow. Emissions varied along the continuum, with peaks occurring at turbulent sites of major confluence. Although land use influenced the spatial variability in concentrations along the river, seasonal changes in temperature influenced the relative importance of the different gases to global warming potential, and hydrology mediated where they were produced as well as their overall concentrations and emissions.

众所周知，河流在全球范围内排放大量的温室气体，但是，很少有研究评估土地利用，河流特征（例如，主要汇合处，形状变化）以及水文学对碳耦合动力学的相互作用影响。二氧化碳（CO ₂），甲烷（CH ₄）和一氧化二氮（N ₂ O）。在这里，我们测量了北温带大河主干河146.6 km延伸段上15个站点上15个站点的CO ₂，CH ₄和N ₂ O浓度和通量：Rivièredu Nord，该地区的地质，土地利用和冬季冰盖都发生了突然的变化。连续三年，沿河的每个站点均按目标的低流量和高流量时刻每季度采样一次。总体而言，在城市和农业活动最为密集的下游地区发现了所有气体的最高浓度。冬季，冰中CO ₂和N ₂ O总体最高，而夏季则CH ₄最高。这条河总是在CH _4中过饱和，而地表水在N ₂ O和CO _2中偶尔会过饱和。，尤其是在原始上游的夏季低流量时期。但是，在高流量期间，空间变异性被最小化了。排放沿连续性变化，峰值出现在主要汇合处的湍流部位。尽管土地利用影响了沿河浓度的空间变异性，但温度的季节性变化影响了不同气体对全球变暖潜能的相对重要性，而水文学在其产生的位置以及总浓度和排放量方面由水文进行了介导。