ABSTRACT
Introduction ................................................................................................................................. 190 Important Chemical Reactions .................................................................................................. 190
Principal Elements Involved ................................................................................................. 190 Relation of Features to Redox Potential .............................................................................. 191
Basic Kinds of Features .............................................................................................................. 193 Organic-C-Based Features ..................................................................................................... 193 Iron and Manganese-Based Morphological Features Related to Reduction ................. 193
Redox Concentrations ....................................................................................................... 194 Redox Depletions .............................................................................................................. 196 Reduced Matrix ................................................................................................................. 199 Gley Soil Colors .................................................................................................................200
Formation of Redoximorphic Features ....................................................................................200 Redox Depletions ................................................................................................................... 201 Redox Concentrations............................................................................................................ 202 Reduced Matrix ...................................................................................................................... 203 Effects of Texture on Redoximorphic Feature Appearance .............................................. 204 Time Needed to Form Redoximorphic Features ................................................................ 204 Constructed Wetlands............................................................................................................ 206 Ditching Effects ....................................................................................................................... 207
Interpreting Morphological Features of Reduction ............................................................... 208 Relating Feature Abundance to Duration of Saturation and Reduction ........................ 208 Seasonal High Water Table Determinations ....................................................................... 209 New Approaches .................................................................................................................... 210
Problem Situations ...................................................................................................................... 211 Identifying Relict Features of Reduction ............................................................................ 211
