interphase soil processes

the chemically significant components of the soil atmosphere
-CO2-O2
why CO2 is important in soil
impacts solution pH
why O2 is important in soil
impacts redox status
when gases readily diffuse thru the soil
under water-unsat conditions
the effect of carbonic acid in rain and soil
makes rain naturally acidic and hastens the weathering of soil minerals
the role of oxygen concerning redox statur
oxygen is an oxidizing agent (electron acceptor)
the type of environment in the presence of oxygen
oxidizing (aerobic)
the type of environment in the absence of oxygen
reducing
why there’s reducing conditions in water-saturated soil
the low water solubility of O2
what happens as a result of the degradation of biopolymers and the dissolution (aka weathering) of minerals in soil?
the products of this breakdown get released into the soil solution and many reprecipitate to form relatively stable minerals, such as hydrous metal oxides
dissolution
weathering of soil minerals
exchangeable ions
ions in solution that are attracted to inorganic and organic surfaces by relatively weak electrostatic forces
adsorbed substances
soluble substances that form direct chemical bonds with soil particle surfaces
hydrophobic partitioning
mechanism of retention where a substance is essentially repelled from the polar soil solution and partitions into the nonpolar molecule framework of soil organic matter
the 7 elements that constitute 98% of the mass of soils
-O
-C
-Si
-Al
-Fe
-Ca
-K
the phase change that occurs in soils during synthesis
going from soil atmosphere or soil solution to soil solids
the phase change that occurs in soils during decay
going from soil solids to soil atmosphere or soil solution
the phase change that occurs in soils during precipitation
going from soil solution to soil solids
the phase change that occurs in soils during weathering
going from soil solids to soil solution
ion exchange in soils
exchange of ions between soil solution and soil solids
the phase change that occurs in soils during adsorption
going from soil solution to soil solids
the phase change that occurs in soils during partitioning
going from soil solution to soil solids
the phase change that occurs in soils during desorption
going from solid phase to soil solution
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