Читать книгу Laboratory Methods for Soil Health Analysis, Volume 2 - Группа авторов - Страница 65

Soil carbon stocks are commonly quantified at fixed depths as the product of soil bulk density, depth, and organic carbon (OC) concentration. Soil C stocks are estimated using the following equation:

C is the organic C stock in the soil layer (Mg ha^–1); OC is the total organic C content in the soil layer (%); Ds is the soil density in the soil layer (Mg m^–3), and E is the thickness of the sampled layer (cm). However, this method systematically overestimates SOC stocks in samples from areas with a higher bulk density, such as minimum tillage, thus exaggerating their benefits. This is not to discourage the use of such calculations, but rather to build awareness that estimates of real SOC change can be greatly compromised if bulk densities differ among treatments or over time.