Potential carbon storage in biochar made from logging residue: Basic principles and Southern Oregon case studies

Area of Science:

• Environmental Science
• Forestry
• Climate Change Mitigation

Background:

• Biochar production from logging residue is proposed for terrestrial carbon storage.
• This process aims to mitigate global warming from anthropogenic greenhouse gas emissions.

Purpose of the Study:

• To model the temporal dynamics of biochar carbon stocks.
• To evaluate sensitivity to biophysical and production parameters.
• To attribute net carbon storage to biochar production scenarios.

Main Methods:

• Developed a generalized model for biochar carbon stock dynamics.
• Evaluated model sensitivity to various parameters.
• Attributed net carbon storage to specific production scenarios using Oregon mixed-conifer forest data.

Main Results:

• Net carbon storage is negative for decades, then positive for centuries.
• Positive storage levels reach approximately one-fourth of feedstock carbon.
• Storage is sensitive to conversion efficiencies, residue decay, and baseline fates.

Conclusions:

• Biochar production can lead to long-term carbon sequestration.
• Net storage realization is sensitive to initial conditions and process efficiencies.
• Biochar decay rates significantly slower than residue decay are key for positive storage.