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<p>Dissolved organic matter (DOM) is an important component of freshwater ecosystems, in which it partially originates from the decomposition of detritus in surrounding soils. Its composition serves as a reliable indicator of water quality and ecosystem functioning. Streams flowing through native forests, where nutrient retention in soils is high, typically exhibit low DOM concentrations, though this varies with soil type and hydrological conditions. This study examined DOM concentrations and composition in a stream catchment located in Valdivia, Chilean North Patagonia (39°S), which is characterized by dominant native forest cover. The aim of this study was to establish baseline values for future comparisons with more anthropogenically influenced catchments. To achieve this, water samples were collected over an 8-month period that encompassed both the dry and rainy seasons, and DOM composition was analyzed using spectrofluorometry and parallel factor analysis. Our results revealed high concentrations of DOM, which predominantly consisted of fluorescent components resembling humic and fulvic acids, particularly during initial precipitation events. Strong positive correlations were observed between all of the identified fluorescence components, while humic ultraviolet absorbance showed significant negative correlations with total precipitation, river flow, dissolved oxygen, turbidity, dissolved organic carbon, and total nitrogen loads. These findings highlight the seasonal dynamics of DOM export, which are driven by precipitation and influenced by biogeochemical interactions. The patterns observed align with those of similar studies undertaken in Chilean North Patagonia, which emphasizes the need for further research to understand the temporal variations of humic substances and their ecological role in aquatic ecosystems. Such insights are critical for informing conservation and management strategies for forest-dominated catchments.</p>

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Seasonal variation of dissolved organic matter in a low-order river associated with a North Patagonian relict of evergreen native forest (Valdivia, 39°S, Chile)

  • 期刊论文

  • 发表日期：

    2026年7月6日

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  • Carlos Esse,
  • Francisco Encina-Montoya,
  • José Tomás Valenzuela,
  • Daniela Rivera-Ruiz,
  • Francisco Correa-Araneda,
  • Patricio De los Ríos-Escalante,
  • Claudia Alvarado-Flores,
  • Jorge Nimptsch

摘要

Dissolved organic matter (DOM) is an important component of freshwater ecosystems, in which it partially originates from the decomposition of detritus in surrounding soils. Its composition serves as a reliable indicator of water quality and ecosystem functioning. Streams flowing through native forests, where nutrient retention in soils is high, typically exhibit low DOM concentrations, though this varies with soil type and hydrological conditions. This study examined DOM concentrations and composition in a stream catchment located in Valdivia, Chilean North Patagonia (39°S), which is characterized by dominant native forest cover. The aim of this study was to establish baseline values for future comparisons with more anthropogenically influenced catchments. To achieve this, water samples were collected over an 8-month period that encompassed both the dry and rainy seasons, and DOM composition was analyzed using spectrofluorometry and parallel factor analysis. Our results revealed high concentrations of DOM, which predominantly consisted of fluorescent components resembling humic and fulvic acids, particularly during initial precipitation events. Strong positive correlations were observed between all of the identified fluorescence components, while humic ultraviolet absorbance showed significant negative correlations with total precipitation, river flow, dissolved oxygen, turbidity, dissolved organic carbon, and total nitrogen loads. These findings highlight the seasonal dynamics of DOM export, which are driven by precipitation and influenced by biogeochemical interactions. The patterns observed align with those of similar studies undertaken in Chilean North Patagonia, which emphasizes the need for further research to understand the temporal variations of humic substances and their ecological role in aquatic ecosystems. Such insights are critical for informing conservation and management strategies for forest-dominated catchments.