Interactive Priming of Biochar and Labile Organic Matter Mineralization in a Smectite-Rich Soil
Abstract
Biochar is considered as an attractive tool for long-term carbon (C) storage in soil. However, there is limited knowledge about the effect of labile organic matter (LOM) on biochar-C mineralization in soil or the vice versa. An incubation experiment (20 °C) was conducted for 120 days to quantify the interactive priming effects of biochar-C and LOM-C mineralization in a smectitic clayey soil. Sugar cane residue (source of LOM) at a rate of 0, 1, 2, and 4% (w/w) in combination with two wood biochars (450 and 550 °C) at a rate of 2% (w/w) were applied to the soil. The use of biochars (~ -36‰) and LOM (-12.7‰) or soil (-14.3‰) with isotopically distinct δ(13)C values allowed the quantification of C mineralized from biochar and LOM/soil. A small fraction (0.4-1.1%) of the applied biochar-C was mineralized, and the mineralization of biochar-C increased significantly with increasing application rates of LOM, especially during the early stages of incubation. Concurrently, biochar application reduced the mineralization of LOM-C, and the magnitude of this effect increased with increasing rate of LOM addition. Over time, the interactive priming of biochar-C and LOM-C mineralization was stabilized. Biochar application possesses a considerable merit for long-term soil C-sequestration, and it has a stabilizing effect on LOM in soil.
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Positive priming is induced via the addition of fresh labile carbon which can stimulate the activities of soil microorganisms, thus accelerating the carbon mineralization process.
“Positive priming is induced via the addition of fresh labile carbon which can stimulate the activities of soil microorganisms, thus accelerating the carbon mineralization process (Fang et al. 2019; Keith et al. 2011; Zimmerman and Ouyang 2019).”
From Role of biochar toward carbon neutrality (2023) · cites this paper as Keith et al. 2011
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- Authors
- Keith, A., Singh, B., & Singh, B. P.
- Affiliations
- The University of Sydney (AU)
- Corresponding author
- Singh, Balwant
- Venue
- Environmental Science & Technology
- Publisher
- American Chemical Society (ACS)
- Published
- 2011-10-20
- Volume
- 45
- Issue
- 22
- Pages
- 9611-9618
- ISSN
- 0013-936X (ISSN-L)
- 1520-5851
- OpenAlex
- W2322552228
- Cited by
- 343
- References
- 3
- Citations by year
- 2026: 12 · 2025: 14 · 2024: 18 · 2023: 27 · 2022: 19 · 2021: 18 · 2020: 23 · 2019: 18 · 2018: 29 · 2017: 26 · 2016: 31 · 2015: 34 · 2014: 41 · 2013: 24 · 2012: 7
- FWCI
- 36.37
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Environmental Science & Technology (publishedVersion)
- PubMed (publishedVersion)
- Funders
- University of Western Sydney
- Topics
- Life Sciences › Agricultural and Biological Sciences › Soil Science › Soil Carbon and Nitrogen Dynamics
- Physical Sciences › Environmental Science › Global and Planetary Change › Fire effects on ecosystems
- Life Sciences › Agricultural and Biological Sciences › Soil Science › Soil erosion and sediment transport
- Keywords
- biochar, labile organic matter, carbon mineralization, priming effect, soil carbon sequestration, sugarcane waste, wood biochar, carbon isotope labeling, soil carbon stabilization, biochar application rate
- MeSH terms
- Charcoal, Soil, Temperature, Silicates
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