An in-situ DGT (diffusive gradient in thin films) technique was deployed to gleyic-layer soils identified in the active layer of eight Arctic islands for the release-resupply processes of labile Cd, Zn, and Pb during the thawing season. The capability to maintain the initial soil concentration of these metals is highly dependent upon landscape elevation and soil texture, which determines the labile pool size of metals (K_dl). Cd and Zn had larger labile pools compared to Pb, indicating a larger resupply capacity for those metals. The rate at which the soil system can supply metal from solid phase to solution, represented as response time (T_c), of Zn and Cd was very short (<1 min), indicating rapid resupply. The longer T_c for Pb (~5 min) was consistent with its slower desorption. In fluctuating permafrost-affected areas, the increasing elevation, which causes heterogeneity in soil texture, organic matter, and pH, resulted in lower K_dl and higher T_c for Cd, Zn, and Pb. Combined with BCR methods, labile Cd was associated with Fe oxides, Zn was associated with both Fe and Mn oxides, and Pb was associated with Mn oxides and also highly bound to micro-aggregates and dissolved organic matter.

将原位DGT（薄膜中的扩散梯度）技术部署到在八个北极岛屿的活动层中确定的 gleyic 层土壤中，用于解冻季节期间不稳定的 Cd、Zn 和 Pb 的释放-再补给过程。维持这些金属初始土壤浓度的能力在很大程度上取决于景观海拔和土壤质地，这决定了金属的不稳定池大小 (K _dl )。与 Pb 相比，Cd 和 Zn 具有更大的不稳定池，表明这些金属具有更大的再供应能力。土壤系统可以将金属从固相供应到溶液的速率，用响应时间 (T _c ) 表示，Zn 和 Cd 非常短（<1 分钟），表明快速补给。时间越长Ť _ÇPb (~5 分钟) 与其较慢的解吸一致。在受永久冻土影响的地区，海拔升高导致土壤质地、有机质和 pH 值的异质性，导致Cd、Zn 和 Pb 的K _dl较低，而 T _c较高。结合 BCR 方法，不稳定的 Cd 与 Fe 氧化物相关，Zn 与 Fe 和 Mn 氧化物相关，Pb 与 Mn 氧化物相关，并且还与微团聚体和溶解有机物高度结合。