Hydrologically isolated wetlands offer critical ecosystem services including water filtration and storage, carbon sequestration, and wildlife habitat, among many others. Geomorphic features formed via landslides, termed slump blocks, along the central coast of California can create the ideal, lower angle conditions for wetland hydrology to persist, followed by hydrophytic vegetation and hydric soils. Areas susceptible to the formation of slump block wetlands are those along steep slopes underlain by metamorphosed ultramafic (serpentine) colluvial and residual parent materials due to their propensity to slip along fracture planes. The soils that form in these settings do not exhibit traditional redoximorphic features near the surface that are necessary to identify wetland soils via field observation of morphological features. The objective of this study is to examine the morphology of hydromorphic soils forming in serpentine colluvium and residuum and determine wetland status by employing a combination of biogeochemical, hydrological, and vegetative assessments. These serpentinite‐derived soils forming on slump block geomorphic surfaces meet the technical standard of hydric soils using Indicator of Reduction in Soil tubes as a proxy, despite the lack of traditional observable redoximorphic features. In addition, both wetland hydrology and hydrophytic vegetation communities were documented, therefore meeting the three requirements of wetlands. Ultimately, the importance lies in properly identifying and delineating ecosystems in need of conservation and as such, we propose an alternate field indicator for use in serpentine soils forming in landslide‐susceptible terrain.

中文翻译：

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蛇纹石母体材料导致形成非典型的水土

水文隔离的湿地提供了关键的生态系统服务，包括水过滤和存储，碳固存和野生生物栖息地等。沿加利福尼亚中部海岸通过滑坡形成的地貌特征（称为坍落度块）可以为湿地水文学持续发展创造理想的低角度条件，其次是水生植被和水土。易形成坍塌块状湿地的区域是沿变质超镁铁质（蛇纹石）冲积层和残余母体作用在陡坡下的地区，因为它们倾向于沿断裂面滑动。在这些环境中形成的土壤在地表附近没有表现出传统的氧化还原形态特征，这是通过野外观察形态特征来识别湿地土壤所必需的。这项研究的目的是通过结合生物地球化学，水文和植物学评估研究蛇纹石坡地和残渣中形成的水​​状土壤的形态，并确定湿地的状况。尽管缺乏传统的可观察到的氧化还原形态特征，但这些坍塌块地貌表面上形成的蛇纹岩来源的土壤符合“土壤管中的还原指标”作为含水土壤的技术标准。另外，湿地水文和水生植物群落都有文件记载，因此满足了湿地的三个要求。最终，重要的是要正确识别和划定需要保护的生态系统，因此，我们提出了一种替代现场指标，用于在滑坡易感地形中形成的蛇形土壤中。