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J. Jpn. Soc. Soil Phys.
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No. 3/, p. ,+ -, ,**-

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    *Soil Proﬁle Distribution and Terrain Attribute on a Hilly Site
Junichi KASHIWAGI** Graduate School of Agriculture, Hokkaido University
Abstract
The purpose of this study was to appreciate the spatial variability of upland soil proﬁle oncomplex hillslope and to consider the adequacy of geomorphological information to explain thesoil proﬁle distribution. On a +.,-ha upland ﬁeld of central Hokkaido, Soil proﬁle was investigated at +/. locations on a +.-m grid.

Apparent di#erences were recognized according to

the location on a slope position. In the landsurface model units of Interﬂuve and Convex Creep
Slope, horizon sequence was Ap/C-type, the color of Ap-horizon soil in this area was relatively
bright and coarse texture.

In the units of Colluvial Footslope and Alluvial Toeslope, horizon

sequence was Ap/Ab/B/C-type, the Ap-horizon soil color was relatively dark and ﬁne texture
inﬂuenced by sedimentation. Terrain attributes, slope gradient, slope curvature, speciﬁc catchment area etc, calculated from the 1m-digital elevation model were highly correlated with
A-horizon thickness except for slope gradient.

Thick A-horizon was observed at the location

which topographic conditions were convex slope, low altitude and high speciﬁc catchment area.
The multiple regression model of A-horizon thickness by terrain attributes didn’t have su$cientresult for quantitative tool. However landsurface model units identiﬁed the A-horizon thickness
distribution. Geomorphological analisys is useful to guide soil management system with consideration of spatial variability.
Key words : soil proﬁle, spatial variability, terrain attributes, landsurface model units,
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Analysis and Slope Mapping, Zeitchrift fur
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Kirkby, M. J. (+312) : Hillslope Hydrology, JOHNWILEY & SONS.
Kreznor, W.R., Olson, K.R., Banwart, W.L. and John-

A OPNQ RQA

son, D.L. (+323) : Soil, Landscape, and Erosion Re-

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lationships in a Northwest Illinois Watershed,[ =?D3%2# $'(1<

Soil Sci. Soc. Am. J., /- : +10-ῌ+11+.

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Miller, M.P., Singer, M. J. and Nielsen, D.R. (+322) :abcGde1  PLANC fg RQM

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Moore, I.D., Grayson, R.B. and Ladson, A.R. (+33+) :Digital Terrain Modelling : A Review of Hydrological, Geomorphological, and Biological Appli-

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tural Nonpoint Source (AGNPS) Pollution Model,
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ῌ ῑ ῐ ῍Park, S. J., McSweeney, K. and Lowery, B. (,**+) :Carson, M.A. and Kirkby, M. J. (+31,) : Hillslope Form

Identiﬁcation of the Spatial Distribution of Soils

and Process, Cambridge University Press.

Using a Process-based Terrain Characterization,

Conacher, A. J. and Dalrymple, J.B. (+311) : The Nine
Unit

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toPennock, D. J., Zebarth, B. J. and DeJong, E. (+321) :Pedogeomorphic Research, Geoderma, +2 : +ῌ+/..

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Curtis, L.F., Doornkamp, J.C. and Gregory, K. J.
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Dalrymple, J.B., Blong, R. J. and Conacher, A. J.

HummockyTerrain,Saskatchewan, Canada

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Snedecor, G.W. and Cochran, W.G. ª «¬w
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Model, Zeitchrift fur Geomorphologie N.F. Bd.,

Controlling Throughﬂow Generation : A Discus-+, : 0*ῌ10.

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sion, Earth Surface Processes, / : +21ῌ+3+.

Daniels, R.B., Gilliam, J.W., Cassel, D.K. and Nelson, L.

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Digital Elevation Model Resolution : E#ects onin the North Carolina Piedmont, Soil Sci. Soc.

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Soil-Landscape Modeling, Geoderma, +** : 01ῌ23.
Timlin, D. J., Pachepsky, Ya., Snyder, V.A. andBryant, R.B. (+332) : Spatial and Temporal Variability of Corn Grain Yield on a Hillslope, Soil Sci.

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Zevenbergen, L.W. and Thorne, C.R. (+321) : Quantitative Analysis of Land Surface Topography,
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