In peatland-dominated regions of discontinuous permafrost, widespread permafrost thaw has led to an expansion of treed wetlands on the landscape. Treed wetlands have greater topographic variation than the collapse scar wetlands from which they evolved, but their hydrological role in the landscape has not been identified. This study examines the development of treed wetlands, and characterises their physical, thermal and hydrological properties in relation to their adjacent peat plateaus and collapse scar wetlands. Electrical resistivity tomography was used to determine the geophysical characteristics of treed wetlands. Snow cover, soil moisture and temperature, as well as water level and storm response were monitored and compared in treed wetlands, plateaus and collapse scars. Treed wetlands were permafrost free, although unlike collapse scars they may contain multi-year ice bulbs. For treed wetlands, the late-winter snow water equivalent, average soil temperature and moisture, unsaturated layer thickness and duration of frozen ground were all intermediate between those of peat plateaus and collapse scars. Treed wetlands interact hydrologically with adjacent peat plateaus and collapse scars in one of two types of local flow sequences depending upon topographic position, which governs the potential role of treed wetlands as a thermal buffer if treed wetlands are situated between a collapse scar wetland and permafrost-cored peat plateau. As permafrost thaw reduces the cover of both peat plateaus and the collapse scar wetlands that develop from them, the development and expansion of treed wetlands appear to be transitioning plateau-wetland complexes into the permafrost-free black spruce forest.

中文翻译：

---

解冻不连续多年冻土区树木湿地的水文

在泥炭地占主导地位的不连续永久冻土区，广泛的永久冻土融化导致景观中树木湿地的扩大。树木湿地比形成它们的塌陷疤痕湿地具有更大的地形变化，但它们在景观中的水文作用尚未确定。本研究考察了树木湿地的发展，并描述了与其相邻的泥炭高原和塌陷疤痕湿地相关的物理、热和水文特性。电阻率层析成像用于确定树木湿地的地球物理特征。在树木繁茂的湿地、高原和塌陷疤痕中监测和比较了积雪、土壤湿度和温度，以及水位和风暴响应。树木繁茂的湿地没有永久冻土，尽管与塌陷疤痕不同，它们可能包含多年冰球。对于树木湿地，晚冬雪水当量、平均土壤温度和湿度、非饱和层厚度和冻土持续时间均介于泥炭高原和塌陷痕之间。根据地形位置，树木湿地与相邻的泥炭高原和塌陷疤痕在水文上相互作用，这取决于地形位置，如果树木湿地位于塌陷疤痕湿地和永久冻土之间，则这控制着树木湿地作为热缓冲的潜在作用。有核泥炭高原。由于永久冻土融化减少了泥炭高原和由它们形成的塌陷疤痕湿地的覆盖，