Site #7: 1920 Fire Fluvial deposit (gravel)
July 27, 1995
L.M. Arocena and K. Driscoll
 
Depth (cm) Horizon Description 
  S Bryophytes. 
3-2 Lv  Twigs, coniferous needles, fungal mycelia. 
2-0 Hr  Moist; very dark brown (10YR 2/2 m); weak; massive, friable, fibrous; common, very fine roots; few Collembola; few, random fungal mycelia. 
0-17 Ae  Grayish brown (10YR 5/2 wet); loamy sand; weak, medium, subangular blocky breaking into single grain; non-sticky and non-plastic; abundant, fine to medium, vertical, exped roots; clear, smooth boundary. 
17-36 Bt  Dark brown (7.5YR 3/3 m); loamy sand; moderate, fine to medium, subangular blocky; friable; few, coarse, vertical and horizontal and plentiful, medium, vertical, exped roots; gradual, smooth boundary. 
36-65 C  Dark yellowish brown (10 YR 3/4 m); loamy sand; massive; friable; very few, medium, vertical, exped roots. 
65+ IIC Gravel deposit 
Selected physical and chemical properties - Pedon 7.
 
HORIZON Sand
%		 Clay
%		 Silt
%		 C
%		 Ti
%		 Zr
ppm		 pH
dH2O		 pH
0.01M CaCl2 
Ae  69.1  2.80  28.1  0.78  0.314  171  4.3  3.5 
Bf  73.8  5.20  21.0  2.7  0.281  129  4.4  3.7 
C  78.3  2.60  19.1  2.3  0.250  123  4.6  4.1 
 
HORIZON By NH4OAc By NH4Cl 
Al
cmol(+)kg-1		 Ca
cmol(+)kg-1		 Fe
cmol(+)kg-1		 K
cmol(+)kg-1		 Mg
cmol(+)kg-1		 Mn
cmol(+)kg-1		 Na
cmol(+)kg-1 		 CEC
cmol(+)kg-1 
Ae  < 0.022  1.2  < 0.011  0.24  0.15  0.012  0.035  2.6 
Bf  0.12  0.43  0.064  0.12  0.094  0.028  0.011  5.9 
C  0.30  0.16  0.031  0.033  0.030  0.010  0.014  2.8 
 
HORIZON Alp
%		 Fep
%		 Alo
%		 Feo
%		 ODOE* 
Ae 0.0010  0.0040  0.0090  0.010  0.090 
Bf 0.18  0.41  0.40  0.53  2.9 
C 0.15  0.14  0.49  0.26  1.6 

o = (NH4)2C2O4      p = Na4P2O7      * = optical density of oxalate extract 

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