Dissolved organic matter (DOM) acts as an important biogeochemical component of aquatic ecosystems that controls nutrient cycling, influences water quality, and links terrestrial and oceanic carbon pools, yet long‐term studies of how changing environmental drivers alter its abundance and composition are rare. Using a 10‐year, spatially explicit data set from Everglades National Park, a globally significant wetland, we investigated the relationships between DOM quality/quantity and hydrologic/climatic drivers along two contrasting marsh‐estuarine transects based on generalized linear modeling and a cumulative sums analysis. Analyses revealed distinct spatial, seasonal, and interannual patterns in variability of DOC and optical properties. Landscape‐scale seasonal patterns showed an enrichment in microbial‐like and protein‐like DOM during the dry season relative to the wet season. While some compositional constituents varied with the solar calendar, responsive to temperature and photoperiod, others varied with the hydrologic calendar. Independent water level and discharge effects indicated strong hydrologic control on DOM quality that differed between the two transects, evidencing differences in their connectivity to areas of high agricultural activity. Across all sites, a significant long‐term increasing trend in the fluorescence index was observed, associated with a positive correlation with precipitation and also potential changes in agricultural inputs, with other features associated with drought and hurricanes. Lastly, the cumulative sums analysis revealed differences between the two transects in the sensitivity of DOM composition to decreased water levels associated with 30‐year climate scenarios, with the less hydrologically dynamic transect exhibiting greater potential sensitivity.

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在亚热带湿地中将水文学与溶解的有机物特征联系起来：佛罗里达大沼泽地的长期研究

溶解有机物（DOM）是水生生态系统中重要的生物地球化学成分，可控制营养循环，影响水质并连接陆地和海洋碳库，但长期的研究很少涉及不断变化的环境驱动因素如何改变其丰度和组成。我们使用全球重要湿地大沼泽国家公园（Everglades National Park）的十年空间明确数据集，沿着广义线性建模和累积总和，沿着两个相对的沼泽河口样带调查了DOM质量/数量与水文/气候驱动因素之间的关系。分析。分析表明，DOC和光学特性的变化具有明显的空间，季节和年际规律。与干旱季节相比，干旱季节的景观尺度季节格局显示了微生物样和蛋白质样DOM的富集。虽然某些成分成分随太阳日历的变化而变化，但随温度和光周期的变化而变化，而其他成分随水文日历的变化而变化。独立的水位和流量影响表明对两个断面之间的DOM质量有很强的水文控制，表明它们与农业活动频繁地区的连通性不同。在所有地点，都观察到荧光指数的长期长期显着增长趋势，与降水呈正相关，与农业投入物的潜在变化呈正相关，与干旱和飓风有关的其他特征也是如此。最后，