Role of Soluble Organics in the Soil Processes of a Podzol, Central Cascades, Washington

Speciation of Al in soil solution from forest soils in northern Kyoto with special reference to their pedogenetic process

“…Moreover, the 1H-NMR spectra showed that the fulvic acids in the soil solution appeared to be a mixture of simple phenolic acids, carboxylic acids, and/or polysaccharides, and scarcely contained a soil fulvic acid-like fraction consisting of phenolic components highly substituted by acidic functional groups. On the other hand, in the above-cited cases for Spodosols, a certain amount of a soil fulvic acid-like fraction was detected in the soil solution (Dawson et al 1978). Thus, the higher ratio of DOC/organic A1 in this study could be partly attributed to the lack of a strong chelating agent in the organic matter dissolved in the soil solution.…”

Sources and Transformation of Dissolved Organic Carbon in the Harp Lake Forested Catchment: The Role of Soils

“…The dominant process by which organic carbon, aluminum and iron accumulate in the B horizon of Spodosols is generally assumed to be through transport in solution from surface layers followed by sorption and precipitation (Dawson, Ugolini & Fasth 1978;Brady 1984). Sorption and desorption exchange equilibria are determined by many factors, including soil mineralogy, organic carbon content, solution pH and sorption kinetics (Nodvin, Driscoll & Likens 1986;Jardine, Weber & McCarthy 1989).…”

Comparison of nutrient concentrations in organic layers between broad-leaved and coniferous forests

“…Soil genesis under forest vegetation is also affected by the substances derived from decomposing litter (Dawson et al 1978). In general, the concentrations of nutrients in the fresh litter of broad-leaved species are higher than those of coniferous species (Morita 1972), and broad-leayed litter usually decomposes more quickly than coniferous litter (Williams and Gray 1974).…”