Spatial Variability in Soil Ion Exchange Chemistry in a Granitic Upland Catchment
M. I. Stuttera,e,*,
L. K. Deeksb,d and
M. F. Billettc,e
a The Macaulay Institute, Craigiebuckler, Aberdeen. AB15 8QH, UK
b National Soil Resources Institute, Cranfield University, North Wyke, Devon. EX20 2SB, UK
c Centre for Ecology and Hydrology, Bush Estate, Penicuik, Midlothian. EH26 0QB, UK
d Soil-Plant Dynamics Unit, Scottish Crop Research Institute, Dundee. DD2 5DA, UK
e School of Biological Sciences, University of Aberdeen. AB24 3UU, UK

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Fig. 1. Site location and detail of the two soil positions in relation to surface topography and drainage.
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Fig. 2. Sample designs of (a) Typic Placaquod and (b) Typic Humaquept soil plots.
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Fig. 3. Triangular diagrams contrasting base cation distributions between plots and horizons of (a) Placaquod and (b) Humaquept soils. Cation proportions are expressed on a molc basis. The precipitation chemical composition is given for comparison ( ).
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Fig. 4. Variograms for selected properties of (i) O and (ii) B horizons of the Placaquod and (iii) O and (iv) B horizons of the Humaquept.
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Copyright © 2004 by the Soil Science Society of America.