This is available from wikipedia: The pyrolysis of forest- or agriculture-derived biomass residue generates a biofuel without competition with crop production.
Biochar is a pyrolysis byproduct that may be ploughed into soils in crop fields to enhance their fertility and stability, and for medium- to long-term carbon sequestration in these soils.
Biochar enhances the natural process: the biosphere captures CO2, especially through plant production, but only a small portion is stably sequestered for a relatively long time (soil, wood, etc.).
Biomass production to obtain biofuels and biochar for carbon sequestration in the soil is a carbon-negative process, i.e. more CO2 is removed from the atmosphere than released, thus enabling long-term sequestration.
With regard to impacts of biochar on climate change use of biochar has been shown (https://en.wikipedia.org/wiki/Biochar) to be dependent on the properties of the biochar, as well as the amount applied, and there is still a lack of knowledge about the important mechanisms and properties. Biochar impact may depend on regional conditions including soil type, soil condition (depleted or healthy), temperature, and humidity. Modest additions of biochar to soil reduce nitrous oxide N2O emissions by up to 80% and eliminate methane emissions, which are both more potent greenhouse gases than CO2.
Find more from https://en.wikipedia.org/wiki/Biochar
Mirza Arshad Ali Beg
Please check these links for said query.
https://www.researchgate.net/publication/235661279_Impact_of_biochar_addition_to_soil_on_greenhouse_gas_emissions_following_pig_manure_application
http://link.springer.com/article/10.1007/s11104-012-1250-3
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https://www.researchgate.net/publication/48856254_Impacts_of_sixteen_different_biochars_on_soil_greenhouse_gas_production
http://www.biochar-international.org/biochar/carbon
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