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Single-throughput Complementary High-resolution Analytical Techniques for Characterizing Complex Natural Organic Matter Mixtures
Published on: January 7, 2019
Molecular C dynamics downstream: the biochemical decomposition sequence and its impact on soil organic matter
A Stuart Grandy1, Jason C Neff
1Michigan State University, East Lansing, MI 48824, USA. grandya1@msu.edu
The Science of the Total Environment
|January 15, 2008
Summary
Soil organic matter
Area of Science:
- Soil Science
- Organic Chemistry
- Biogeochemistry
Background:
- Spectroscopic and chemical methods advance soil organic matter characterization.
- Molecular characteristics of soil carbon are known across diverse ecosystems.
- Contextualizing soil organic matter knowledge remains a challenge.
Purpose of the Study:
- Present a conceptual model for molecular soil carbon dynamics.
- Stimulate interdisciplinary research on ecological implications of carbon turnover.
- Investigate management and process controls on molecular carbon dynamics.
Main Methods:
- Conceptual modeling of soil carbon dynamics.
- Analysis of molecular patterns in soil size fractions.
- Evaluation of decomposition sequences and molecular transformation.
Main Results:
- Soil size fractions exhibit unique molecular patterns influenced by decomposition controls.
- A common, yet alterable, molecular decomposition sequence exists.
- Lignin constrains decomposition in larger fractions but not mineral-associated ones.
Conclusions:
- Mineral-associated carbon has a distinct composition from plant inputs.
- Disturbances like N fertilization and tillage can have downstream effects on carbon stabilization.
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