Abstract Wildfire activity has been increasing in forests of western North America over the past several decades. However, the biogeochemical effects of changing fire regimes are poorly understood. Here, we utilize sediment records from three subalpine lakes in northern Colorado (Hinman, Gold Creek, and Summit) to investigate the biogeochemical consequences of charcoal-inferred fire events over the past ∼2500 years. We measured element concentrations and stable isotope ratios (δ13C, δ15N) in lake sediments to track past biogeochemical processes. On average, fires were followed by increases in carbon (C), nitrogen (N), and sulfur concentrations in lake sediments, which lasted ∼20 years, while titanium and other metals found in terrestrial mineral material decreased. These changes were only statistically significant (p

中文翻译：

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科罗拉多州北部三个亚高山湖泊中全新世晚期野火的生物地球化学后果

摘要 在过去的几十年里，北美西部森林中的野火活动一直在增加。然而，人们对改变火势的生物地球化学影响知之甚少。在这里，我们利用科罗拉多州北部三个亚高山湖泊（Hinman、Gold Creek 和 Summit）的沉积物记录来调查过去 2500 年木炭推断火灾事件的生物地球化学后果。我们测量了湖泊沉积物中的元素浓度和稳定同位素比率（δ13C、δ15N），以追踪过去的生物地球化学过程。平均而言，火灾之后湖泊沉积物中碳（C）、氮（N）和硫的浓度增加，持续了约 20 年，而在陆地矿物材料中发现的钛和其他金属减少。这些变化仅具有统计学意义（p