The AML recalssifies the landscape based on two input maps, namely a)
topographic position as derived from a topographic reclassification procedure
like topoclass.aml, and b) a geologic reclassification
of the many stratigraphic units as usually present in geologic maps (see
e.g. geoclass.aml). Geologic reclassifications
are usually necessary in order to maximize the ecological usability of
geologocal maps and to reduce the excessive number of units that usually
show similar ecological response. The following table exemplifies how the
reclassification is done. The geological and the topographic classes (in
green) are used to generate maps of the soilproperties "Depth",
"CFC" (coarse fragment
content), and "SSMC" (specific
soil moisture holding capacity). The reclassification
scheme is based on an expert system classification as porposed by R.F.
Fischer (unpubl., see Roberts et al., 1993 for further explanations).
===========================================================
*IGNEOUS COARSE (1)
-------------------
Texture: DEPTH(m):
CFC(%): SSMC(mm/m):
RIDGE:
Sandy
1.0 70
70
SLOPE:
Sandy Loam 2.0
50 120
TOE SLOPE: Sandy Loam
2.5 30
120
BOTTOM:
Silty Clay Loam 3.0 10
150
*IGNEOUS FINE (2)
-----------------
Texture: DEPTH(m):
CFC(%): SSMC(mm/m):
RIDGE:
Sandy Loam 0.5
80 120
SLOPE:
Silt Loam 2.0
60 170
TOE
SLOPE: Silt Loam
2.5 40
170
BOTTOM:
Clay Loam 3.0
20 120
*SEDIMENTARY COARSE (3)
-----------------------
Texture: DEPTH(m):
CFC(%): SSMC(mm/m):
RIDGE:
Sandy Loam 1.0
70 120
SLOPE:
Silt Loam 2.0
60 170
TOE
SLOPE: Silty Clay Loam 2.5
50 150
BOTTOM:
Clay Loam 3.0
20 120
*SEDIMENTARY FINE (4)
---------------------
Texture: DEPTH(m):
CFC(%): SSMC(mm/m):
RIDGE:
Silt Loam 1.5
80 170
SLOPE:
Silt Loam 2.5
60 170
TOE
SLOPE: Silty Clay Loam 3.0
40 150
BOTTOM:
Clay Loam 3.5
10 120
*ALLUVIAL & OTHER COARSE MIXED DEPOSITS
(5)
-------------------------------------------
Texture: DEPTH(m):
CFC(%): SSMC(mm/m):
RIDGE:
Sandy
0.5 80
70
SLOPE:
Loamy Sand 2.0
70 100
TOE
SLOPE: Loamy Sand
2.5 60
100
BOTTOM:
Loamy Sand 3.0
50 100
===========================================================
The newly generated grids (depth, CFC, and SSMC, respectively) can be
used for further analysis now. See swb.aml for
further examples.
| Command: | &r soilprop (at GRID prompt) |
| Required input: | Grids of surface geology and topographic classes |
| Output units: | Grids of SSMC, Depth, and CFC |
| Speed of calculations: | Rather fast |
| Flexibility of the routine: | Medium; user can adjust AML at interface |
| User interface: | Limited, but simple and easy |
| Known errors: | - |
| Programmer | N.E. Zimmermann |
| Download: | soilprop.aml (use: "save link as") |
| Contact: | niklaus.zimmermann @ wsl.ch |
References:
Roberts, D.W., Fisher, R.F., Long, J.M. and Jack, S.N., 1993. The Leaf Area Allocation Model. Final Report for EPA Cooperative Agreement #817539.
Last Updated: 9/08/00
[top] [back] [home]