HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Harris, W. G. Articles by Comerford, N. B. Search for Related Content PubMed Articles by Harris, W. G. Articles by Comerford, N. B. Agricola Articles by Harris, W. G. Articles by Comerford, N. B.

Experimental Formation of Aquod-like Features in Sandy Coastal Plain Soils

Soil and Water Science Department, Univ. of Florida, Gainesville, FL 32611

*Corresponding author (wghs{at}gnv.ifas.ufl.edu).

ABSTRACT

Coastal-plain Spodosols of the southeastern USA are inexplicably associated with fluctuating water tables. This study tested hypotheses that account for water-table influence in Aquod genesis: (i) sand-grain coatings are released when Fe (a binding agent) is dissolved by organic acids; (ii) coatings migrate to form an eluvial-illuvial sequence; (iii) C and metals accumulate in the illuvial matrix; (iv) imperfectly drained sands are predisposed to podzolization due to low crystalline Fe; and (v) a minimum solution residence time near the site of acid release is required. Toeslope and summit positions on hillslopes were sampled and subjected to physical, chemical, and mineralogical characterization. Iron dissolution at increasing loading rates of oxalic acid was monitored by batch extractions. A column experiment was conducted to test predisposition and residence-time effects on formation of Aquod-like features and on effluent composition. Columns were eluted daily with oxalic acid (0.001, 0.05, and 0.01 M) under freely drained or 22-h saturation conditions. Ratios of iron/aluminum in oxalic acid extracts were higher at higher loading rates. Iron abundance and crystallinity increased from toeslopes to summits. Aquod-like features (light eluvial zones, darkened lamellae, etc.) developed most conspicuously in toeslope columns, and only for the 22-h residence treatment. Columns most affected released less Fe, Al, and oxalic acid. Results supported our hypotheses for laboratory conditions. Further study is needed using in situ methods and indigenous solution components.

Received for publication March 11, 1994.

This article has been cited by other articles:

				M. Chen, L. Q. Ma, and W. G. Harris Arsenic Concentrations in Florida Surface Soils: Influence of Soil Type and Properties Soil Sci. Soc. Am. J., March 1, 2002; 66(2): 632 - 640. [Abstract] [Full Text] [PDF]

				W.G. Harris and K.A. Hollien Changes across Artificial E-Bh Boundaries Formed under Simulated Fluctuating Water Tables Soil Sci. Soc. Am. J., May 1, 2000; 64(3): 967 - 973. [Abstract] [Full Text]