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Related Experiment Video

Updated: Sep 6, 2025

Single-throughput Complementary High-resolution Analytical Techniques for Characterizing Complex Natural Organic Matter Mixtures
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Microbial and Environmental Processes Shape the Link between Organic Matter Functional Traits and Composition.

Ang Hu1,2, Kyoung-Soon Jang3, Fanfan Meng2,4

  • 1College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China.

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|June 23, 2022
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Global change alters aquatic ecosystems by shifting dissolved organic matter (DOM) assembly. Deterministic processes increasingly shape recalcitrant DOM, impacting microbial communities and carbon cycling.

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Area of Science:

  • Environmental Science
  • Microbiology
  • Biogeochemistry

Background:

  • Dissolved organic matter (DOM) is crucial for microbial metabolism and biogeochemical cycles.
  • Understanding how DOM molecular assemblages respond to global change is critical but poorly understood.

Purpose of the Study:

  • To investigate the deterministic and stochastic processes governing DOM assembly across environmental gradients.
  • To partition DOM into functional fractions and link their assembly to microbial communities under global change.

Main Methods:

  • Analysis of DOM and bacterial communities in 300 aquatic microcosms across temperature and nutrient gradients.
  • Partitioning DOM into labile/recalcitrant and active/inactive fractions based on molecular traits.
  • Quantifying the influence of deterministic and stochastic processes on DOM fraction assembly.

Main Results:

  • Active DOM fractions (labile or recalcitrant) are primarily assembled by deterministic processes.
  • Stochastic processes dominate the assembly of inactive DOM fractions.
  • Deterministic selection increases with global change for recalcitrant DOM, paralleled by microbial community assembly and environmental filtering.

Conclusions:

  • DOM assembly shifts from potential reactivity to realized activity under global change.
  • Active and inactive DOM fractions are structured by contrasting processes.
  • Recalcitrant DOM components are consistently sensitive to global change, impacting carbon turnover.