Abstract：
Persistent organic pollutants (POPs) tend to accumulate in cold regions by cold condensation and global distillation. Soil organic matter is the main storage compartment for POPs in terrestrial ecosystems due to deposition and repeated air-surface exchange processes. Here, physicochemical properties and environmental factors were investigated for their role in influencing POPs accumulation in soils of the Tibetan Plateau and Antarctic and Arctic regions. The results showed that the soil burden of most POPs was closely coupled to stable mineral-associated organic carbon (MAOC). Combining the proportion of MAOC and physicochemical properties can explain much of the soil distribution characteristics of the POPs. The background levels of POPs were estimated in conjunction with the global soil database. It led to the proposition that the stable soil carbon pools are key controlling factors affecting the ultimate global distribution of POPs, so that the dynamic cycling of soil carbon acts to counteract the cold-trapping effects. In the future, soil carbon pool composition should be fully considered in a multimedia environmental model of POPs, and the risk of secondary release of POPs in soils under conditions such as climate change can be further assessed with soil organic carbon models.
摘要：
持久性有机污染物（POPs）倾向于通过冷冷凝和全球蒸馏在寒冷地区积累。由于沉积和反复的空气-表面交换过程，土壤有机质是陆地生态系统中POPs的主要储存室。这里,研究了其理化性质和环境因子在影响青藏高原和南极和北极地区土壤POPs积累中的作用。结果表明，大多数POPs的土壤负荷与稳定的矿物缔合有机碳（MAOC）密切相关。结合MAOC的比例和理化性质可以解释POPs的许多土壤分布特征。结合全球土壤数据库估算了持久性有机污染物的背景水平。这导致了一个命题，即稳定的土壤碳库是影响持久性有机污染物最终全球分布的关键控制因素，因此，土壤碳的动态循环可以抵消冷陷效应。在未来,在POPs的多媒体环境模型中，应充分考虑土壤碳库组成，以及在气候变化等条件下POPs在土壤中二次释放的风险可以通过土壤有机碳模型进一步评估。
