The research is about the relations of soils and vegetation to soil carbon captured. The quantification is divided into soil organic carbon, soil inorganic carbon and total soil carbon.
Dr. Carl Trettin, USFS researcher (soil scientist), has published amd made presentations on this subject, and I think much of his work and various citations is on Researchgate. I am sure there are other notable researchers involved with this topic. Carl's citations may help expand your search. If you Conduct an internet search on the exact title, it often brings up not only the work desired, but sometimes good alternatives.
The increase in atmospheric concentration of CO2 by 31% since 1750 from fossil fuel combustion and land use change necessitates identification of strategies for mitigating the threat of the attendant global warming. Since the industrial revolution, global emissions of carbon (C) are estimated at 270±30 Pg (Pg=petagram=1015 g=1 billion ton) due to fossil fuel combustion and 136±55 Pg due to land use change and soil cultivation. Emissions due to land use change include those by deforestation, biomass burning, conversion of natural to agricultural ecosystems, drainage of wetlands and soil cultivation. Depletion of soil organic C (SOC) pool have contributed 78±12 Pg of C to the atmosphere.
If you want to understand the principle mechanisms of carbon sequestration in soils, this review should help you to go more deeply inside:
v. Lützow et al. 2006: Stabilization of organic matter in temperate soils: mechanisms and their relevance under different soil conditions – a review" European Journal of Soil Science, August 2006, 57, 426–445; doi:10.1111/j.1365-2389.2006.00809.x
Atmospheric concentrations of carbon dioxide can be lowered either by reducing emissions or by taking carbon dioxide out of the atmosphere and storing in terrestrial, oceanic, or freshwater aquatic ecosystems. A sink is defined as a process or an activity that removes greenhouse gas from the atmosphere. The long-term conversion of grassland and forestland to cropland (and grazing lands) has resulted in historic losses of soil carbon worldwide but there is a major potential for increasing soil carbon through restoration of degraded soils and widespread adoption of soil conservation practices.