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Stabilization and Incorporation into Biomass of Phenolic and Benzenoid Carbons during Biodegradation in Soil
Author(s) -
Kassim Ghiath,
Stott Diane E.,
Martin J. P.,
Haider K.
Publication year - 1982
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1982.03615995004600020018x
Subject(s) - ferulic acid , chemistry , loam , biodegradation , biomass (ecology) , humus , organic chemistry , environmental chemistry , agronomy , food science , soil water , environmental science , biology , soil science
The biodegradation, incorporation into biomass, and stabilization in humus of specific carbons of ferulic, p ‐hydroxycinnamic, anisic, and benzoic acids and catechol were followed in Steinbeck loam (pH 5.0) and Greenfield sandy loam (pH 7.0). Biomass was estimated by the fumigation procedure. The least incorporation into biomass was noted for the three‐side chain carbon of ferulic acid (1.0 to 1.4%) and the greatest for the two‐side chain carbons of either ferulic or p ‐hydroxycinnamic acids (10.9 to 17.6%). Greater amounts of carbon were evolved as carbon dioxide (CO 2 ) and incorporated into the biomass in the acid soil than in the neutral soil. Approximately 74% of the ring carbons of catechol were stabilized in the neutral soil after 12 weeks but only 2% of that was in biomass. The amount of residual carbon found in the biomass decreased with time. The amount of residual ring‐carbons of anisic and benzoic acids incorporated into the biomass were 19 and 15%, respectively. As the substrate concentration increased from 1 to 10,000 ppm, the carbon released as CO 2 from ferulic acid and glucose ranged from 47 to 85% and from 63 to 85%, respectively. The residual ferulic acid and glucose carbons in biomass ranged from 2.2 to 11% and 19 to 39%, respectively. The study indicated that relatively higher amounts of the phenolic carbons were stabilized in the soil humus while greater amounts of the glucose carbons were incorporated into the soil biomass, and that compared to glucose, greater amounts of the residual carbons of the phenolic compounds were not solubilized by 6 N HCl hydrolysis.