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Optimizing Cryo-Focused Pyrolysis GC/MS for Tracing Soil Organic Matter Across Diverse Ecosystems.

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Soil organic matter (SOM) composition varies significantly across diverse ecosystems. Ecosystem type is the primary driver of these differences, influencing nutrient cycling and carbon storage.

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Area of Science:

  • Environmental Science
  • Biogeochemistry
  • Analytical Chemistry

Background:

  • Soil organic matter (SOM) cycling is crucial for terrestrial ecosystem functions, including nutrient cycling and greenhouse gas emissions.
  • Molecular-level characterization of SOM is essential for understanding its fate and function.
  • Pyrolysis-gas chromatography/mass spectrometry (py-GC/MS) is a key technique for SOM analysis.

Purpose of the Study:

  • To develop an automated data analysis pipeline for py-GC/MS and evolved gas analysis/mass spectrometry (EGA/MS).
  • To characterize the molecular composition of SOM across seven diverse ecosystems.
  • To identify the influence of ecosystem type, soil depth, and density fractions on SOM composition.

Main Methods:

  • Utilized a cryo-focused py-GC/MS system for analyzing soil samples.
  • Developed an automated data analysis pipeline with peak deconvolution and a custom compound class library.
  • Implemented fragmentation spectrum-based molecular networking for SOM analysis.

Main Results:

  • Ecosystem type was identified as the dominant factor influencing SOM compositional differences.
  • Trends in the origin of SOM compounds (microbial vs. plant-derived) were observed across soil depth and density fractions.
  • Molecular networking revealed widespread and ecosystem-specific compounds, with some unique to environments like wetlands.

Conclusions:

  • The developed automated workflow enhances molecular-level SOM characterization.
  • Ecosystem type significantly shapes SOM molecular composition and influences SOM persistence and turnover.
  • Molecular insights into SOM complexity are vital for understanding biogeochemical cycles and environmental drivers.