Members of the traditional school of thought take it as the base of the solum; a smaller school takes it to bottom of the C horizon (e.g. Cline, 1961; Richter and Markevitz, 1995; Richter and Yaalon, 2011), some of them including the C horizon within the solum (Whiteside, 1959; ...
We use the chemical speciation model, PHREEQC, to show that conditions are favorable for secondary mineral precipitation below the soil O-horizon. The data are coupled with residence times to compute long-term and contemporary weathering rates. Contemporary rates of weathering are higher than the ...
in all directions, but it varies with position relative to the water table within a soil (the depth horizon where pore-water pressure is atmospheric, which defines the zero-pressure datum) and with the proportion of soil weight carried by contacts among the soil grains (intergranular contacts)....
31,32. Studies have shown that the composition of the elements essential for plant growth in lunar regolith is very similar to those in the Earth’s soil27. Unfortunately, the fertility of lunar regolith is greatly poorer than that of the Earth soil, due to the influence of lunar environment...
Soil– geomorphic relations on the Blue Ridge Front: I. Regolith types and slope processes - Graham, Daniels, et al. - 1990 () Citation Context ...tain laurel ecosystem. Higher B horizon clay in the oak–blueberry ecosystem reflects this ecosystem’s frequent occurrence on south-facing upper...
Under both vegetation types, the largest differences in residual water fluxes were near the soil–weathered rock contact. However, there was a significant relation between minor differences in fluxes and soil horizon boundaries, confirming the effects of vegetation conversion on soil properties and ...
Although the Alfisols contain an argillic horizon, and the Entisols have no such horizon of clay accumulation, the main impact on GPR effectiveness is related to mineralogy. The bedrock at the Alfisol site, which contains more mafic minerals (5% hornblende and 20% biotite), is more ...
Case studies show that, in arid and semi-arid desert sand-covered terrains, sampling of fine-fraction (-120 mesh, <0.125 mm) clay-rich horizon soil is cost-effective for regional geochemical surveys for sandstone-type uranium, gold, and base metal deposits. Fine-fraction sampling, selective-...
This was done by pitting and sampling on some selected soil geochemical profile lines. The sampling was controlled by various regolith horizons and for each horizon, samples were taken from preserved residuals, mottled zones, transported sandy soil, sap rock and degraded laterite materials. The ...
The light REEs (LREEs) tend to be concentrated in the B horizon and laterally across the hilltops, whereas the HREEs are mobilized by groundwater and soil solutions and accumulated in the upper C horizon vertically and the footslope profiles laterally. In conclusion, nepheline syenite was ...