Soil chemical change is usually viewed as a change in one or more of the commonly employed methods for the chemical analysis of the solid phase of the soil (a capacity change). The pools (kg ha-1) of nutrients commonly analyzed in standard soil analyses are often very large and therefore are thought to change very slowly. On the other hand, changes in the solution phase of the soil, although very strongly affected by changes in the solid phase, can take place almost instantaneously (an intensity change). The interactions between capacity and intensity type changes are complex, but chemically consistent with one another (Reuss and Johnson, 1986). This paper reviews laboratory studies, field studies, and modeling exercises which demonstrate the interactions between capacity and intensity-type changes in soil adsorbed cation and anions, both over the short term and long term. Reuss, J.O., and D.W. Johnson. 1986. Acid Deposition and the Acidification of Soil and Water. Ecological Studies No. 59. Springer-Verlag, New York. 118 p.
Johnson, D.W., Richter, D.D. (2009): Short- and Long-term Perspectives of Soil Change: Interactions between Capacity and Intensity (Invited) . Fall meeting, American Geophysical Union, December 2009. 90(52). Abstract B34B-01. .