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Area of Science:

  • Environmental Science
  • Ecology
  • Biogeochemistry

Background:

  • Interbasin water transfers (IBTs) are large-scale projects altering inland hydrology and biogeochemical cycles.
  • The impact of IBTs on dissolved organic matter (DOM) and microbial communities remains poorly understood.

Purpose of the Study:

  • To investigate how IBTs rewire DOM-microbe coupling in hydrologically altered ecosystems.
  • To elucidate the mechanisms driving these changes using advanced analytical techniques.

Main Methods:

  • Utilized Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS) for DOM characterization.
  • Employed high-throughput sequencing to analyze microbial community composition.
  • Applied network analysis to understand DOM-microbe interactions.

Main Results:

  • IBTs altered DOM composition and microbial communities, increasing labile DOM by 70% in receiving waters.
  • Receiving waters showed higher abundances of Cyanobacteriota and Actinomycetota.
  • Rare microbial taxa played a significant role in DOM-microbe coupling, which was enhanced in IBT-receiving waters.

Conclusions:

  • DOM molecular traits are key drivers of microbial community structure and DOM-microbe coupling under IBTs.
  • IBTs significantly rewired DOM-microbe interactions, impacting biogeochemical cycling.
  • Findings advance understanding of ecosystem responses to large-scale hydrological engineering.