Climate warming is responsible for many environmental changes in the Arctic, which lead to the decomposition of soil organic matter (SOM) and emissions of greenhouse gases from the soil into the atmosphere. Soil minerals play a crucial role in SOM stabilization. However, little is known about the occurrence and stability of organo-mineral associations in permafrost-affected soils in the Arctic. The main aims of this study were: 1) to determine the potential occurrence of SOM within interlayers of swelling clay minerals in the permafrost-affected soils in central part of Spitsbergen (Svalbard, High Arctic) and 2) to determine resistance of the intercalated SOM within the clay minerals against thermal and chemical oxidation. The obtained results indicate that 10% to 15% of organic carbon and 30% to 45% of total nitrogen occurring in the clay fraction of the Arctic permafrost-affected soils are intercalated within the swelling clay minerals. We also report that this part of SOM is highly resistant to both chemical and thermal oxidation. These findings should be taken into consideration in the refinement of climate models and in studies concerning the thawing of permafrost, SOM mineralization, and emissions of greenhouse gases from the soil into the atmosphere.

气候变暖是北极许多环境变化的原因，这些变化导致土壤有机质 (SOM) 分解和温室气体从土壤排放到大气中。土壤矿物质在 SOM 稳定中起着至关重要的作用。然而，关于在北极受永久冻土影响的土壤中有机矿物组合的发生和稳定性知之甚少。本研究的主要目的是：1) 确定在斯匹次卑尔根岛中部（斯瓦尔巴群岛，高北极）受永久冻土影响的土壤中膨胀粘土矿物夹层中 SOM 的潜在发生率和 2) 确定插入的 SOM 的抵抗力在粘土矿物内抵抗热和化学氧化。获得的结果表明，在受北极永久冻土影响的土壤的粘土部分中，10% 至 15% 的有机碳和 30% 至 45% 的总氮嵌入膨胀的粘土矿物中。我们还报告说，这部分 SOM 对化学和热氧化都有很强的抵抗力。在完善气候模型以及有关永久冻土融化、SOM 矿化和温室气体从土壤排放到大气中的研究中，应考虑到这些发现。