Effects of Nanostructural Organization of Soil Gels on the Fractional Composition of Soil Humic Substances

摘要

The abundance, resources, and composition of humus are among the most important quantities that determine almost all valuable properties of soils [1]. The qualitative features of soil humus are characterized via determination of its fractional-group composition based on different solubilities of humic substances (HS) as a function of pH [1]. This approach offers a very useful tool for evaluating the state of soils. However, it has a serious drawback because of its underlying idea that soil humus is a mixture of humic acids (HA), fulvic acids (FA), and humin. As a result, there is no satisfactory explanation to some trends in variation of the fractional-group composition of humus (on the background of an unchanged total humus percentage) during a season or upon soil freezing [2].