Implementation of hydrologic modifications within the southeastern coastal Everglades over the last century have impacted ecological functioning of the system. This study characterized and investigated the effects of hydrologic modifications through the C-111 canal system on soil physicochemical properties of marsh and tree island community types within the southeastern coastal Everglades. Marshes within the C-111 basin and larger southeastern coastal Everglades exhibited lower soil nutrient contents than tree islands, which were characterized by 4.6 times higher organic matter content, 2.4 times higher total carbon concentrations, 2.6 times higher total nitrogen concentrations, and 5.8 times higher total phosphorus concentrations. Further investigation into soil profiles between community types illustrated pedological discontinuities observed within the soil matrix that coincided with the implementation of the C-111 canal. Pedological discontinuities were characterized by a shift to more organic soils within both community types but were less often observed within tree islands, suggesting that (a) hydrologic modification within the southeastern coastal Everglades alters soil physicochemical properties and (b) tree islands are potentially more resilient to long-term perturbations in freshwater flow than more dynamic marsh systems.

中文翻译：

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表征水文对佛罗里达州沿海大沼泽地树岛和沼泽内土壤物理化学变化的影响

上个世纪东南沿海大沼泽地内实施的水文改造影响了该系统的生态功能。本研究通过 C-111 运河系统表征和调查了水文改造对东南沿海大沼泽地内沼泽和树岛群落类型土壤理化性质的影响。C-111 盆地内的沼泽和更大的东南沿海大沼泽地土壤养分含量低于树岛，其特征是有机质含量高 4.6 倍，总碳浓度高 2.4 倍，总氮浓度高 2.6 倍，高 5.8 倍总磷浓度。对群落类型之间土壤剖面的进一步调查表明，与 C-111 运河的实施相吻合，在土壤基质内观察到的土壤学不连续性。土壤学不连续性的特点是在两种群落类型中都转向了更多有机土壤，但在树岛内观察到的情况较少，这表明 (a) 东南沿海大沼泽地内的水文变化改变了土壤物理化学特性，(b) 树岛可能更具弹性与更具动态性的沼泽系统相比，淡水流的长期扰动。