Environmental Engineering Reference
In-Depth Information
Figure 28.10
Tropical forest
management for environmental
protection and sustained yields.
Source: After Simmons (1989).
Table 28.2 Economic return from different uses of
one hectare of lowland tropical rain forest in
eastern Peru
Use
Annual income
(US$)
a
Net present
value (US$)
b
Comments
Extractive uses
Latex harvest
22
440
Does not include other forest
products or tourism
Edible fruits harvest
400
6000
Total (harvesting)
422
6440
Sustainable selective
logging
15
490
Total (harvesting +
sustainable logging)
437
6930
Conventional
'development' uses
One-time removal of
marketable timber
1000
Cutting destroys extractive
resources
Reforestation with Gmelina
arborea
159
3184
Not sustainable
