Site #4: Old growth - Glacial-till
July 20, 1995
L.M. Arocena and K. Driscoll
Depth (cm) Horizon Description 
  S Bryophytes. 
5-4 Ln  Deciduous leaves, twigs, coniferous needles. 
4-1 Fa  Moist; very dark brown (7.5YR 2.5/2 m); moderate non-compact matted, loose, fibrous; abundant, fine roots; few Collembola; few, random fungal mycelia. 
1-0 Hh  Moist; very dark brown (10YR 2/2 m); strong, granular, friable, gritty; abundant, very fine roots; few Lumbricida, few Collembola; few, random droppings; few, random fungal mycelia. 
0-6 Ae  Gray (7.5YR 6/1 m); silt loam; moderate to strong, fine to medium, subangular blocky; slightly friable; abundant, medium and coarse, horizontal, exped roots; charcoal fragments between LFH and Ae; presence of weathering rock fragments (~ 2-50 mm in diameter) with Fe oxides; clear, wavy boundary. 
6-22 Bt1  Strong brown (7.5YR 4/6 m); clay loam; moderate, fine to medium, subangular blocky; friable; plentiful, medium, horizontal and plentiful, fine, horizontal and vertical, exped roots; gradual, smooth boundary. 
22-42 Bt2  Dark brown (7.5YR 3/3 m); clay loam; moderate, medium, subangular blocky; friable; plentiful, medium, horizontal, exped roots; gradual, smooth boundary. 
42-58 BC  Brownish yellow (10YR 6/8 m); clay loam; moderate, medium to coarse, subangular blocky; firm; few, fine to medium, vertical, exped roots; gradual, smooth boundary. 
58+ C  Yellowish brown (10YR 5/6 m); clay loam; massive; very few, fine to medium, vertical, exped roots; abundant weathering of rocks with Fe oxides. 
Selected physical and chemical properties - Pedon 4.
 
HORIZON Sand
%		 Clay
%		 Silt
%		 C
%		 Ti
%		 Zr
ppm		 pH
dH2O		 pH
0.01M CaCl2 
Ahe 30.7 15.2 54.1 1.4  0.409  105  4.2  3.5 
Bm1 29.9 15.4 54.7 1.3  0.464  186  4.5  3.8 
Bm2 38.1 16.4 45.5 1.0  0.378  117  5.1  4.1 
BC 48.5 16.2 35.3 0.48  0.358 109  5.2  4.2 
C 60.4 18.6 21.0 0.31  0.391  117  5.5  4.4 
 
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 2.0 < 0.011 0.19 0.90 0.038 0.023 6.9 
Bm1 0.17 0.45 < 0.011 0.0060  0.31 0.048 0.027 6.1 
Bm2 0.56 0.17 < 0.011 0.10  0.077 0.026 0.014 3.8 
BC 0.27 0.75 < 0.011 < 0.005 0.20 0.021 0.030 3.6 
C 0.025 2.7 < 0.011 < 0.005 0.39 0.026 0.030 5.4 
 
HORIZON Alp
%		 Fep
%		 Alo
%		 Feo
%		 ODOE* 
Ae 0.0090  0.032  0.025  0.056  0.32 
Bm1 0.075  0.27  0.11  0.29  0.64 
Bm2 0.10  0.12  0.22  0.12  0.33 
BC 0.072  0.064  0.091  0.041  0.050 
C 0.035  0.036  0.036  0.045  0.030 

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

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