Before the bell…
 Take out your notes sheet from yesterday
Look at the next picture and answer…
 Why might you NOT want to log here?
 Think about characteristics of habitat/biome it is…
Look at the following pictures and think about things
that must be considered Pre Harvesting of Trees and
Post Harvesting of Trees.
Ecologically Sensitive Areas…
 Areas that are ecologically sensitive and could not
recover from harvesting (unsustainable) should not
be logged.
The Decision
 When forest managers (foresters) and loggers examine a potential
area for logging, these 6 qualities of the forest are analyzed.
Why would you
not log this tree?
#1-Type and age of the tree
 Type and age of the
tree (is the
sustainability of the
species threatened?)
are considered. Rare
species usually are
not cut…and trees
that are too
young/old may not
be cut
 What is wrong
with these situations?
This is Bad!!!
#2- Slope of Land
 Slope of land (will the removal of trees cause the soil to
erode and pollute waterways?)
Why would you
not log here?
#3- Soil Type
 Type of soil (will the soil have enough nutrients to
support re-growth?) This is not possible in rain forests.
Why would you
not log here?
#4- Climate
 Are there appropriate amounts of rain and a temperatures
ranges for the forest to re-grow? Is there a change in the
amount of light?
#5- Wildlife
 Wildlife - Are there any endangered or threatened
species? Is the wildlife sustainable?
What’s wrong here?
#6- Surroundings
 Surroundings (Location) (will it affect nearby ecosystems
such as streams and ponds? Does it fragment a larger
ecosystem?
What can we do after logging to
help the ecosystem grow back?
#1 & 2
 Mechanical Preparation – clear away the logging
debris (duff and slash) with equipment
 Slash burning – Removes debris by burning. This is
low in cost and good for steep slopes.
Why is it hard for trees to grow back here?
#3&4
 Herbicides – Controls weeds with chemicals so trees don’t
compete for resource. May harm wildlife and remove cover.
 Planting – Replant with genetically improved seedlings.
(most Pa forests will re-seed themselves)
#5,6,7
 Thinning – remove overcrowded and poorly growing trees
 Fertilize – Adds nutrients to the soil (usually not necessary)
 Protection – Protect from fire, disease, and insect pests.
This is continuous.