In
Technodiversity, the technogram of the stand is a central element for decision
making, which forest harvesting method will fit to the local stand conditions. It
has the same structure as the ecogram of the harvesting methods. When
both graphs match the methods is well suited for the given stand.
The
structure of the technogram is a 5x5 matrix with the T-classes as X-axis
and the P-classes as Y-axis. The T-class is given by the
natural conditions of the stand.Concerning the
P-class, the owner can decide for himself about the value of the stand. The higher the value, the higher the costs for
technical actions that
he accepts. This represents
the idea of “sacrifice”.
As a principle,
all 25 fields can be selected.But if the owner decides that for him the value of a forest stand is
correlated with its biological productivity, then some combinations of
P-classes and T-classes are quite unlikely (i.e., dry and very productive, wet
and very productive, moist and not productive). Under this condition, only 16 “fields” are filled up.
Let us take an
example:A decision maker sees that the soil in
his forest is moist. So, the T-class is fixed at T3. In addition, the stand has
a high productivity. He may personally decide that this productivity is so
important for him, that he doesn’t want to sacrifice more than 10% of the soil.
So, the distance between the trails must not be less than 40 m.In the graph, he localizes
this stand at the field T3P3 (see the red ring).
Unfortunately,
this is an assessment only for normal weather conditions. In case of a dry weather spell, the moist soil may dry
a bit and behave like fresh soil. So, he should move one column left (sun symbol) to T2 “fresh”. And when it has rained for
several days (rain symbol),
then he moves one column right to T4 “wet”, because the soil, which
normally is moist, now behaves like a wet soil. 0During
this “movement” the system of opening-up, that is fixed by the P-class, does
not change.
