DD.Xerands

Key to Suborders 

DD. Other Andisols that have a xeric moisture regime. Xerands, p. 323 

DD. Xerands are the more or less well drained Andisols that have a xeric moisture regime and a frigid, mesic, or thermic temperature regime. Most of the Xerands in the United States are in Oregon, Washington, Idaho, and California. Most Xerands have a frigid or mesic temperature regime and formed under coniferous forest vegetation. Some formed under grass or shrub vegetation. Characteristically, Xerands have an ochric or mollic epipedon and a cambic horizon. Most of the Xerands in the United States developed in late-Pleistocene or Holocene deposits. 

Definition 

Xerands are the Andisols that:

1. Have a xeric soil moisture regime;

2. Have a frigid, mesic, or thermic soil temperature regime; and

3. Do not have a histic epipedon or the aquic conditions characteristic of Aquands. 

Key to Great Groups 

DDA. Xerands that have a 1500 kPa water retention of less than 15 percent on air-dried samples and less than 30 percent on undried samples throughout 60 percent or more of the thickness either:

1. Within 60 cm either of the mineral soil surface or of the top of an organic layer with andic soil properties, whichever is shallower, if there is no densic, lithic, or paralithic contact, duripan, or petrocalcic horizon within that depth; or

2. Between either the mineral soil surface or the top of an organic layer with andic soil properties, whichever is shallower, and a densic, lithic, or paralithic contact, a duripan, or a petrocalcic horizon. Vitrixerands, p. 326 

DDB. Other Xerands that have a melanic epipedon. Melanoxerands, p. 325 

DDC. Other Xerands. Haploxerands, p. 323

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