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The pore space of soil contains the liquid and gas phases of soil, i.e., everything but the solid phase that contains mainly minerals of varying sizes as well as organic compounds. In order to understand porosity better a series of equations have been used to express the quantitative interactions between the three phases of soil.
Representative bulk densities of soils. The percentage pore space was calculated using 2.7 g/cm 3 for particle density except for the peat soil, which is estimated. [43] Soil treatment and identification Bulk density (g/cm 3) Pore space (%) Tilled surface soil of a cotton field 1.3: 51 Trafficked inter-rows where wheels passed surface 1.67: 37
Porosity of surface soil typically decreases as particle size increases. This is due to soil aggregate formation in finer textured surface soils when subject to soil biological processes. Aggregation involves particulate adhesion and higher resistance to compaction. Typical bulk density of sandy soil is between 1.5 and 1.7 g/cm 3. This ...
In fact the pore space of soil is a uniform fractal e.g. a set of uniformly distributed D-dimensional fractals of average linear size L. For the clay soil it has been found that L=0.15 mm and D=2.7. [20] The surface tension of water explains why the water does not drain out of a wet sand castle or a moist ball of clay.
Soil structure describes the arrangement of the solid parts of the soil and of the pore spaces located between them (Marshall & Holmes, 1979). [1] Aggregation is the result of the interaction of soil particles through rearrangement, flocculation and cementation.
Atmospheric CO 2 concentration is 0.04%, but in the soil pore space it may range from 10 to 100 times that level, thus potentially contributing to the inhibition of root respiration. [66] Calcareous soils regulate CO 2 concentration by carbonate buffering, contrary to acid soils in which all CO 2 respired accumulates in the soil pore system. [67]
When talking about groundwater, there are two types to keep in mind: One, the kind researchers are now worried about, is the unconfined water that gathers in the pore spaces of soil very close to ...
Spaces of different shapes and sizes exist within and between these soil aggregates. The larger spaces between aggregates are called macropores. Macropores can be formed under the influence of physical processes such as wet/dry and freeze/thaw cycles, which result in cracks and fissures of soils.