В. И. Савич The paper considers some issues relating to the evaluation of oxidation-reduction (redox) properties of soils using a system of titration methods with oxidizers and reducing agents, and con-trolled-potential coulometry on electrodes from a soil-coal paste. The redox status of soils can be additionally evaluated using the gas-discharge imaging method through determining the anti-radical activity of soil solutions and the content of antioxidants, carbon dioxide and oxygen, as well as positively and negatively charged complex compounds of cations, air ions in the soil, and the energy status of soils. It is shown that the amount of reduced substances increases in case of abundant soil moisture and increased humus content. The authors prove the reasonability of estimating the redox buffer capacity of soils and offer its mathematical description using 15 equations of pair correlation. In the pH range from 3 to 10, the value of AEh / ApH has amounted to 62.2 in the sod-podzolic soil and 43.9 in gray forest soil. Studies have proved the need to determine the Eh value in the root zone of plants in order to evaluate the redox status of soils. It is shown that plants adapted to the anaerobiosis conditions are highly prone to regulate Eh in the root zone and the absorption selectivity of individual elements. It has been found that to optimize the properties of soils and the “soil-plant” system, it is advisable to take the following joint measures: regulate the Eh factor of soils, inactivate the toxicants that appear in anaerobiosis, and introduce into the plants microelements that are an integral part of the redox enzymes of plants. It is proved that the most complete evaluation of the redox status of soils requires integral interpretation of redox properties, processes and modes to develop models of an optimal redox status of soils necessary to perform various ecological functions.
Научная статья 
buffer capacity