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Updated: Apr 17, 2026

Understanding Dissolved Organic Matter Biogeochemistry Through In Situ Nutrient Manipulations in Stream Ecosystems
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Refractory dissolved organic nitrogen accumulation in high-elevation lakes.

S J Goldberg1, G I Ball1, B C Allen2

  • 1Geosciences Research Division, Scripps Institution of Oceanography, 9500 Gilman Drive, La Jolla, California 92093-0244, USA.

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|February 24, 2015
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Summary

Dissolved organic matter (DOM) acts as a nitrogen sink in Sierra Nevada lakes. Refractory proteinaceous material in Lake Tahoe indicates autochthonous production, influencing nutrient budgets.

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Area of Science:

  • Environmental Chemistry
  • Aquatic Ecology
  • Biogeochemistry

Background:

  • Dissolved organic matter (DOM) plays a critical, yet often overlooked, role in aquatic nutrient cycling.
  • Atmospheric nitrogen (N) deposition has altered nutrient limitation in Sierra Nevada lakes, shifting them towards phosphorus (P)-limitation.
  • Understanding DOM's role in nutrient storage is crucial for accurate aquatic ecosystem management.

Purpose of the Study:

  • To investigate the function of DOM in storing reactive nitrogen (N) within Sierra Nevada lakes.
  • To determine the origin and characteristics of DOM in Lake Tahoe and surrounding smaller lakes.
  • To assess DOM's potential impact on inorganic nutrient stoichiometry in these P-limited systems.

Main Methods:

  • Isolation and characterization of DOM from Lake Tahoe and smaller watershed lakes.
  • Utilized Nuclear Magnetic Resonance (NMR) spectroscopy for molecular analysis of DOM.
  • Employed isotope analyses to trace the origin and residence time of DOM components.

Main Results:

  • Accumulation of refractory, proteinaceous DOM with a long residence time (100-200 years) was identified in Lake Tahoe.
  • DOM in smaller lakes within the same watershed exhibited characteristics typical of terrestrial sources.
  • Autochthonous production of proteinaceous DOM in Lake Tahoe was inferred, contrasting with allochthonous inputs in smaller lakes.

Conclusions:

  • DOM functions as a significant sink for reactive nitrogen (N) in these lake ecosystems.
  • The accumulation of autochthonous proteinaceous DOM in Lake Tahoe influences N storage and ecosystem dynamics.
  • DOM's role in nutrient cycling and stoichiometry is a key factor in understanding the response of these lakes to environmental change.