On the cover: Sheep grazing in front of drifting icebergs near Tasiusaq lagoon, Narsaq, South Greenland. Agriculture has a rich history in South Greenland. Little knowledge exists on the gas diffusion characteristics of these subarctic agricultural soils, which are paramount in estimating both the root zone aeration and terrestrial greenhouse gas fluxes in this rapidly warming region. Weber et al. measured the soil gas‐gas diffusivity 201 × 3 soil cores across six Greenlandic fields to test existing soil gas diffusion models and characterize the gas diffusion characteristics. Photo credit: Peter L. Weber. See article by Weber et al., “Gas diffusion characteristics of agricultural soils from South Greenland.”

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封面图片，第84卷，第5期

封面：南格陵兰纳尔萨克Tasiusaq泻湖附近的流冰山前放牧的绵羊。南格陵兰的农业历史悠久。对这些亚弧农业土壤的气体扩散特性知之甚少，这对于估算这个快速变暖地区的根区通气量和陆地温室气体通量都至关重要。Weber等。在六个格陵兰地区测量了土壤气体-气体扩散率201×3的土壤核心，以测试现有的土壤气体扩散模型并表征气体扩散特性。图片来源：Peter L. Weber。参见Weber等人的文章，“来自南格陵兰的农业土壤的气体扩散特征”。