Why are NTFPs an important component to sustainable forestry?

Essentially, NTFPs can be used to supplement or supplant timber cutting
from forests ecosystems.  Even-aged timber management, the most
common form of forest management in Pacific Northwest forests,  
typically contributes to a decline in forest health through reducing
complex ecological systems to monocrop tree plantations.  Active
management for NTFPs on the other hand can potentially maintain
ecosystem complexity and play an important role in restoring biodiversity
and balance to damaged forests.  Furthermore, extraction of a broader
range of natural resources other than just timber products can lead to
economic diversity and stability for rural forest communities and the
state economy in general.