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Biochar affects carbon composition and stability in soil: a combined spectroscopy-microscopy study
Maria C Hernandez-Soriano1,2, Bart Kerré1, Peter M Kopittke2
1Department of Earth and Environmental Science, KU Leuven, Kasteelpark Arenberg 20, B-3001 Heverlee, Belgium.
Scientific Reports
|April 27, 2016
Summary
Biochar application enhances soil carbon storage by altering carbon distribution and reducing microbial metabolism. This study reveals key mechanisms behind biochar
Area of Science:
- Soil Science
- Environmental Science
- Biogeochemistry
Background:
- Biochar addition to soil can enhance carbon (C) storage.
- The mechanisms driving spatial reorganization of soil C upon biochar amendment are not fully understood.
Purpose of the Study:
- To investigate the mechanisms of carbon reorganization in soil after biochar application.
- To elucidate how biochar influences carbon distribution and metabolism within soil microaggregates.
Main Methods:
- Fourier transformed infrared-microscopy and confocal laser scanning microscopy were employed.
- Silty-loam soil was amended with organic residues and their corresponding biochar.
- Soil incubation for 237 days, alongside measurements of soil respiration and dissolved organic matter fluorescence.
Main Results:
- Biochar-amended soils exhibited lower soil respiration compared to residue-amended soils.
- Biochar application increased a humic-like fluorescent component in dissolved organic matter.
- Aromatic-C accumulation was observed in discrete spots within microaggregates, co-localizing with clay minerals, and its association with polysaccharides decreased.
Conclusions:
- Reduced carbon metabolism is a significant mechanism for carbon stabilization in biochar-amended soils.
- Biochar influences the spatial distribution of carbon within soil microaggregates.
- The interaction between biochar, soil minerals, and organic matter plays a crucial role in soil carbon sequestration.
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