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Relationship Between Plant Phenolic Acids Released during Soil Mineralization and Aggregate Stabilization

USDA-ARS Southwest Watershed Research Center, 2000 E. Allen Road, Tucson, AZ 85719

View larger version (17K): [in a new window]   Fig. 1. Model chemical structure for the phenolic acids (PAs) studied here. The identities of the R1–R4 groups for the various PAs are listed in Table 1.

View larger version (32K): [in a new window]   Fig. 2. Chromatographic trace of phenolic acids (PAs) isolated with alkaline extraction of the (a) Webster soil (unamended control) and (b) Webster soil incubated for 9 d with alfalfa residue. The identities of the PA compounds are given in Table 1.

View larger version (33K): [in a new window]   Fig. 3. Recovery of (a) the isolated phenolic acids (PAs) and (b) the isolated PAs except for coumaric and ferulic acid after incubation of corn residue for 9, 29, 84 d. The identities of the PA compounds are given in Table 1. Points without standard error bars have standard errors less than the marker size (n = 2).

View larger version (29K): [in a new window]   Fig. 4. Linear response and plateau regression relationship between aggregate mean weight diameter (MWD) (mm) measured at d 84 and (a) soil coumaric acid content and (b) total soil ester-linked phenolic acids (PAs) content at Day 84.

View larger version (26K): [in a new window]   Fig. 5. Relationship between organic C content at d 84 and (a) soil 4-hydroxy-benzaldehyde content and (b) total soil ester-linked phenolic acid (PA) content at d 84.

View larger version (14K): [in a new window]   Fig. 6. Chromatographic trace of phenolic acids (PAs) following alkaline extraction of the extracellular polymer produced by Chromobacterium violaceum. The identities of the PA compounds are given in Table 1.

View larger version (18K): [in a new window]   Fig. 7. Chromatographic trace of phenolic acids (PAs) following alkaline extraction of the humic acid isolated from the Webster soil under native prairie vegetation. The identities of the PA compounds are given in Table 1.