definition biochar
41(4):973-989. Definition: Biochar is black carbon produced from biomass sources [i.e., wood chips, plant residues, manure or other agricultural waste products] for the purpose of transforming the biomass carbon into a more stable form (carbon sequestration).ather, biochar spans the spectrum of black carbon forms (Spokas, 2010) and it is chemically and physically unique as a function of the feedstock, creation process (pyrolysis unit), cooling, and storage conditions. PURPOSE: The main purpose for the creation of biochar is for carbon sequestration.