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Transcript
Before the bell…
 Take out your notes sheet from yesterday
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.