Form 5a - ICP Forests

q
r
s
t
u
v
Accumulation of pedogenetic silica
Strong reduction
Illuvial accumulation of sesquioxides
Illuvial accumulation of clay
Urban and other man-made materials
Plinthite
w Development of colour or structure in B (only used with B)
x
y
z
Fragipan
Pedogenetic accumulation of gypsum
Pedogenetic accumulation of salts more soluble than gypsum
(144).4 Horizon vertical
A number is given to designate the vertical subdivision of a master horizon on the basis of
structure, texture, colour, etc. The number 1 is used to designate the upper part of the master
horizon. The number 2 the part of the master horizon situated below, etc. If there is no vertical
subdivision, a 0 (zero) shall be submitted.
(145) Horizon limit superior/inferior
(Soil)
The upper/lower limit of the horizon depth (in centimetre). The limit between organic and
mineral horizons corresponds to 0 cm. For organic horizons, the limits are negative values. For
mineral horizons, the limits are positive values. Note that on peat soils thicker than 40 cm, the 0
cm line is located at the upper limit of the peat layer.
(146) Horizon distinctness D_HORI_DISTINCT
(Soil)
The distinctness of the lower horizon boundary refers to the thickness of the boundary zone in
between adjacent horizons. The topography of the boundary indicates its shape.
Code Distinctness (cm)
1 Extremely abrupt 0.3 - 1 cm
2 Very abrupt 1 – 2 cm
3 Abrupt 0 - 2 cm
4 Clear 2 - 5 cm
5 Gradual 5 - 15 cm
6 Diffuse >15 cm
Page 147 / 151