Exponential growth
6
Exponential growth?
7
Exponential growth?
8
A standard model of logistic growth
9
A standard model of logistic growth
10
Optimal resource use
• Optimal versus stable / resilient plans
• Is Maximum Sustainable Yield (MSY) the optimal resource use?
Poplar plantationSource: Lignovis GmbH
Common beech forest
14
Multifunctional resource use
15
Forest policy law from 1876
with orders / prohibitions:
Ø Planning duty
Ø Prohibition of
privatization
Ø Prohibition of clear cuts
and order to maintain
forests
Example: Switzerland
1903
1961
16
Forestry and sustainability
1903
1961
17
German forestry in the 18th century
«Sylvicultura oeconomica oder haußwirthliche Nachricht und
Naturmäßige Anweisung zur wilden Baum-Zucht» (1713)
‘continuirlich beständige und nachhaltende Nutzung’
Context: Mining and smelting led to deforestation, timber
shortage, increasingly long timber transports, rising prices
=> Economic, not ecological considerations led to the demand
for a different use ('suffer great need in the future'). At the
same time, Carlowitz invoked the creation mandate of
"preservation".
Hans Carl von Carlowitz
1645-1714
Forest policy and biomass use
18
Dynamical systems: population growth
19
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