Salinization and eutrophication are nearly ubiquitous in watersheds with human activity. Despite the known impacts of the freshwater salinization syndrome (FSS) to organisms, we demonstrate a pronounced knowledge gap on how FSS alters wetland biogeochemistry. Most experiments assessing FSS and biogeochemistry pertain to coastal saltwater intrusion. The few inland wetland studies mostly add salt as sodium chloride. Sodium chloride alone does not reflect the ionic composition of inland salinization, which derives from heterogeneous sources, producing spatially and temporally variable ionic mixtures. We develop mechanistic hypotheses for how elevated ionic strength and changing ionic composition alter urban wetland sediment biogeochemistry, with the prediction that FSS diminishes nutrient removal capacity via a suite of related direct and indirect processes. We propose that future efforts specifically investigate inland urban wetlands, a category of wetland heavily relied on for its biogeochemical processing ability that is likely to be among the most impacted by salinization.

中文翻译：

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城市泥浆：淡水盐碱化对内陆城市湿地氮磷有效性和输出的影响

在有人类活动的流域中，盐碱化和富营养化几乎无处不在。尽管已知淡水盐化综合症 (FSS) 对生物体的影响，但我们在 FSS 如何改变湿地生物地球化学方面表现出明显的知识差距。大多数评估 FSS 和生物地球化学的实验都与沿海盐水入侵有关。为数不多的内陆湿地研究大多以氯化钠的形式添加食盐。单独的氯化钠并不能反映内陆盐碱化的离子组成，它来自异质源，产生空间和时间可变的离子混合物。我们提出了离子强度升高和离子组成变化如何改变城市湿地沉积物生物地球化学的机制假设，预测 FSS 通过一系列相关的直接和间接过程降低养分去除能力。我们建议未来的努力专门调查内陆城市湿地，这是一种严重依赖其生物地球化学处理能力的湿地，很可能是受盐碱化影响最严重的湿地之一。