Soil structure, stabilization

Mineral Colloid-Organic Substance-Microorganism Interactions in Relation to Soil Structural Stability... 

Hemanz JL, Lopez R, Navarrete L, Sanchez-Giron V (2002) Long-term effects of tillage systems and rotations on soil structural stability and organic carbon stratification in semiarid central Spain. Soil Tillage Res 66 129-141... 

J. P. Quirk, Some physico-chemical aspects of soil structural stability—A review, in Modification of Soil Structure (W. W. Emerson, R. D. Bond, and A. R. Dexter, eds.) Wiley, Chichester, U.K., 1978. Y. Chen and A. Banin, Scanning electron microscope (SEM) observations of soil structure changes induced by sodium-calcium exchange in relation to hydraulic conductivity, Soil Sci. 120 428 (1975). Y. Chen, J. Tarchitzky, J. Brouwer, J. Morin, and A. Banin, Scanning electron microscope observations on soil crusts and their formation, Soil Sci. 130 49 (1980). 

Soil physical properties most likely to be altered by biomass burning are soil structure, soil wettability, and clay mineralogy (Table HI) (43). The destruction of organic matter results in losses of soil structure, increases in bulk density, diminished aggregate stability and decreases in macropore space (44). 

The infiltration problem caused by water quality is also related to the structural stability of the surface soil (see below). 

CCP3 Soil biological activity and structural stability... 

Soil carbohydrate Hydrolysis and various estimation techniques Indicates potential energy source abundance, various technique controls formation and stabilization of soil structure, dependent upon organic inputs Safarik and Santruckova (1992)... 

The environmental significance of favourable soil structure lies in an improved resistance to structural soil damage, such as compaction and erosion. Soil structure can be measured by a diverse number of physical parameters, such as the stability of aggregates, coarse pores, air capacity and water holding capacity. 

There is a need to resume studies of soil saccharides and peptides. These can compose as much as 30-40% (when account is taken of the compositions of humin materials). Much is known about how polysaccharides of known structures interact with soil colloids, but it has not been possible as yet to know in sufficient detail the structures of the polysaccharides that persist in the soil. Hence we do not know the mechanisms of their binding to soil mineral colloids. The same applies for the peptide materials, though it is clear that polysaccharides and peptides have important roles in soil structure formation and stabilization. 

Oades, J. M. (1984). Soil organic matter and structural stability Mechanisms and implications for management. Plant and Soil 76, 319-337. 

Cass, A. and M. E. Sumner. 1982. Soil pore structural stability and irrigation water quality I-Empirical sodium stability model. Soil Sci. Soc. Am. J. 46 503-506. 

At 3 min, once again incipient gel shells begin to form, and flow channels are opened in several of them. This is shown in Fig. 13.15f. (Due to minor differences in soil structure and gel formation, flow does not usually occur uniformly, and the final shape may be quite different from a sphere. In this case, the figure shows that at this time, flow stopped through the bottom and right-side of the stabilized mass.)... 

Interactions of soil minerals with organic matter and microorganisms exert a vital role in the formation of short-range-ordered metal oxides, humic substances, mineral colloid-humic complexes, aggregates, and the structure and porosity of soils. These nonliving and living reactive components and the structural stability... 

Figure 8.10. The boundary between structural stability (flocculation zone) and instability (dispersion zone) as influenced by chemical factors in soils.

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