In forest carbon stock assessment, we usually use allometric equation to get AGB, times 0.5 to get carbon & times -44/12 to get CO2 emission (removal) value.
Carbon sequestration is capturing the atmospheric carbon through agroforestry system adnd locking it permanently.
Carbon stock is something total amont of carbon converted into the cellulose in a unit area basis and carbon emissions is the amount of Co2 emitted by a system in unit area in response to the fossil fuel burnt. .