Mitigation Industry

Biochar in Mitigation

Plantation forests provide an ideal platform for mitigation of emission

  • Direct C sequestration: Woody biomass production
  • Soil C sequestration
  • Supply of most abundant feedstock for Biochar production
  • Additional C sequestration by storing Biochar in soil

To achieve the C negative goal using Biochar:

  • Biochar has to be lasting in soil, and
  • Biochar has to be produced from biomass that would otherwise have oxidised in the short to medium term.

Benefits of adding Biochar to soil

  • Increase C sequestration
  • Increase crop yields
  • Increase retention of nutrients
  • Increase mineral nutrition (e.g. K)
  • Increase retention of chemicals

Other effects of adding Biochar to soil

  • Increase soil biological activities
    – >  Liming effect
    ->   Enhance moisture retention
    ->   Increase porosity – aeration
    ->   Increase soil temperature
  • It may stimulate soil organic matter decomposition, and reduce the net Biochar C sequestration, especially in soils rich in SOC, e.g., NZ pasture soils

Advantages of applying Biochar to forest soils

  • Low C footprint: on-site production and application with minimal transportation
  • Flexibility
    ->   surface application: potentially high loading rates, or
    ->   incorporation into soil, and
    ->   Nursery application

Research needs

  • Effect of Biochar production and application on the biodiversity of forest soil ecosystems, (e.g., fungi, birds)
  • Maximising the GHG mitigation effects through Biochar addition to the forest soils,  (e.g., Biochar may increase mycorrhizal fungi growth)