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Updated: May 11, 2026

Assessment of Waste-Derived Biochars on the Health and Biological Activity of Soil
10:31

Assessment of Waste-Derived Biochars on the Health and Biological Activity of Soil

Published on: October 10, 2025

Microbial utilisation of biochar-derived carbon.

Mark Farrell1, Thomas K Kuhn, Lynne M Macdonald

  • 1CSIRO Land & Water/Sustainable Agriculture Flagship, PMB 2, Glen Osmond, SA, 5064, Australia.

The Science of the Total Environment
|April 30, 2013
PubMed
Summary

Biochar addition to soil rapidly fuels microbial communities, particularly gram-positive bacteria, and increases carbon dioxide release. This study reveals biochar

Keywords:
(13)C-PLFABlack carbonCarbon sequestrationCharOrganic carbonPyrolysis

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Area of Science:

  • Soil Science
  • Microbiology
  • Biogeochemistry

Background:

  • Biochar, often viewed as inert, contains microbially accessible labile organic carbon.
  • Soil biochar application influences microbial community structure and native soil organic matter (SOM) decomposition.
  • Understanding biochar's labile carbon fate is crucial for soil carbon management.

Purpose of the Study:

  • To investigate the short-term fate of labile biochar carbon within the soil microbial community.
  • To quantify the utilization of biochar-derived carbon by different microbial groups.
  • To assess the impact of biochar on soil respiration and native SOM turnover.

Main Methods:

  • Short-term incubation experiment using (13)C-labelled wheat and eucalypt biochars.
  • Incorporation of labelled biochars into an aridic arenosol.
  • Compound-specific isotopic analysis (CSIA) of phospholipid fatty acids (PLFAs) to track carbon flow.

Main Results:

  • A significant portion of biochar's labile carbon was rapidly utilized by gram-positive bacteria within three days.
  • A sharp peak in CO2 evolution occurred shortly after biochar addition, indicating rapid labile carbon turnover and positive priming of SOM.
  • Microbial activity was a key driver of the observed CO2 release.

Conclusions:

  • Biochar application significantly and rapidly alters soil microbial community composition and activity.
  • The labile fraction of biochar is readily available to soil microbes, particularly gram-positive bacteria.
  • Biochar addition can stimulate soil respiration through direct carbon utilization and priming effects.