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MICHIGAN STATE UNIVERSITY EXTENSION
By Bill Cook MSU Extension Service Forester
MANAGEMENT OPTIONS FOR MIXED HARDWOOD
TYPES
Forest management practices vary considerably across forest types, site
conditions, market availability, and many other factors. There simply is
not any single way or best way to manage all forests, or even a
particular kind of forest. While nature is a dynamic system that defies
simple categorization, there remains a body of knowledge and experience
that can be very effectively applied.
The "mixed" hardwood type is a particularly hard one to manage because
it can include such a wide variety of species and conditions. However,
we can exclude some common forest types. Northern hardwoods are stands
dominated by sugar maple. Oak- hickory types are dominated by oaks and
hickories, of course. "Mixed" hardwoods also don't include stands
dominated by aspen or paper birch.
To take a stab at defining "mixed" hardwoods; they are probably upland
sites dominated by red maple, with lots of other possible species in the
stand. For the most part, these are stands that have been beat-up pretty
badly in the past.
Deciding what to do will depend a lot upon two things; 1) the soil-site
conditions and 2) current species composition. On nutrient-rich and
well-drained sites, there will be more choices. Potentials tail-off as
site quality declines. As for composition, without spending a lot of
money, we're pretty much stuck with what's there, al- though options
exist to "push" forest succession in one way or another. Try to extract
the best quality out of whatever exists.
Family forest owners with an interest in twiddling around in the forest
have the ability to do more than what might be accomplished on most
corporate or public forests. For family forests, time spent in the woods
represents more recreation than billable hours. With about 300,000
owners in Michigan, each with some kids and/or friends, we can reach a
work force of a million people in short order. This is an incredible
resource. The first step in managing these "mixed" forest types is to
settle on a vision for the future. Change will take time. Record this
vision in a management plan. Account for practical considerations such
as biological potential, work availability, cost-share programs, and
wood product markets. You'll likely find other considerations along the
way, too. This is where working with a professional forester can come in
really handy.
Mixed hardwoods with elements of sugar maple, red oak, black cherry,
white pine, hemlock, and other species valuable for either timber or
wildlife can be favored. Mini-management areas can be developed to
expand these desirable elements. Often that means removing less
desirable trees and shrubs, scuffing up the ground to expose bare soil.
and then letting nature take its course. However, if deer densities
exceed something like 20-25 per square mile on your forest, then all
bets are off, unless you can afford a lot of expensive fences.
With woodlands in especially bad shape but growing on decent sites,
consider a series of clearcuts or sheIterwood cuts. Starting over might
be a whole lot faster and better than trying to mini-manage and nudge
your way to an objective. Sometimes, underplanting certain species is a
good idea. Of course, sun-loving tree species are not an option.
Time will be needed. Helping heal abused woodlands requires an
investment of patience and persistence. But, the rewards will come. As
you closely work with your forest, you will see small changes in
positive directions. This will feel very satisfying. Eventually, there
may be enough volume and/or value to interest a commercial timber sale.
The revenue will feel good to your pocketbook, but the giant step
forward in forest improvement will feel even better. Good forest
management always looks to the future of the forest and better quality.
Sometimes, these "mixed" hardwood forests have more fun built into them
than the eye first sees. Raising good kids and successfully sending them
off into the world takes many years of loving care. The next best thing,
perhaps, is applying the same idea to a woodland.
MANAGEMENT OPTIONS FOR DIFFICULT SPECIES
Forest management practices vary considerably across forest types, site
conditions, market availability, and many other factors. There simply is
not any single. way or best way to manage all forests, or even a
particular kind of forest. While nature is a dynamic system that defies
simple categorization, there remains a body of knowledge and experience
that can be very effectively applied.
In many cases, some tree species are difficult to regenerate. Nature
has a lot of variables to consider. When you mate that with the number
of human variables, there is little wonder that a "one size fits all"
prescription is a very rare thing in forest management In some cases and
in some places, forest regeneration cannot be achieved.
Certain trees immediately come to mind; white cedar paper birch, white
pine, eastern hemlock oaks. basswood, hickories, butter nut, and others.
There are two broad categories of reasons why trees sometimes don't
regenerate well. First, environmental reasons and. second, human
reluctance to implement proven forest management techniques. Of course.
the reasons are often inter-related.
Environmental reasons range widely. White-tailed deer may
preferentially feed on some seedlings. If browse pressure is too high.
many years may pass before regeneration can grow past the height of a
deer. Competition with understory plants may preclude the success of
certain species of trees. Site and soil conditions may have changed.
preventing regeneration. The introduction of insects and diseases can
all but eliminate some tree species. These effects typically don't occur
everywhere. The effects might ebb and flow over time. In other cases,
impacts are wide- spread and long term.
Examples? Well, deer browsing can easily preclude the regeneration of
cedar, white pine. hemlock, and other species. Pennsylvania sedge can
inhibit regeneration of not only most trees, but also many understory
plants. Historic fires and changes in water tables due to road
construction can alter site conditions that prevent regeneration of some
tree species. Most everyone will remember the devastating effects of
Dutch elm disease and chestnut blight. The emerald ash borer currently
threatens similar loss in our ash resource.
The many environmental challenges to tree regeneration represent one
more good reason to actively manage forests. Nature will not necessarily
produce what we want or need. Nature is not always best. Nature has also
been forever altered by human history.
Despite some of these environmental factors, the human element is more
important.
What are some of the human variables? Perhaps, the main challenge is
the wide- spread benign neglect many forest owners implement on their
forest lands. Doing "nothing" has consequences in forest composition and
ecology, sometimes negative consequences. Species such as aspen, paper
birch, cherry, and balsam fir disappear.
Certain insect and disease cycles can accelerate, diversity may be
lost, tree stress increases, and forest vigor declines. These outcomes
come as a surprise to many. Many tree species require bare mineral soil
and lots of sunlight in order to reproduce. In nature, these conditions
occur after wildfires, severe windstorms, and widespread mortality from
an insect or disease. In forest management, harvest techniques mimic
these natural events, but are often considered "bad" because of their
visual impacts.
As more people build more homes in the forest, a whole host of problems
increase, particularly the introduction of exotic pests. Broken canopies
result in the more or less permanent reduction in late successional
plants and animals. A well-planned timber harvest has temporary
environmental impacts and resembles natural occurrences. Forests never
recover from home construction and urban splatter.
Human perceptions, values, and desires often trump science and
research. This is particularly true in forestry. As a result, that
lakeshore cabin surrounded by paper birch becomes a sea of broken trees
and thick shrubbery because the owner chose not to open the canopy and
disturb the forest floor for the paper birch seeds. White pine is
underplanted at considerable cost, in less than optimum conditions,
because revenue- generating methods are somehow perceived as harmful.
Yellow birch is subjected to "plan B" site quality because thick mats of
forest litter cover the soil.
If someone were to stick their neck out and try to suggest a single
forest management technique that would resolve most of these
regeneration challenges. it would probably be a combination of timber
harvesting (more light) and soil surface disturbance (good seedbeds for
many species). The science is there in most cases. Of course, such
suggestions fly in the face of certain visual quality perceptions.
However, this wouldn't be the first case where the realities of nature
and human attitudes don't match' And, it won't likely be the last. As
always, work with a professional forester to help you make the best
decisions possible.
As an MSU Extension forester. l provide
educational programming for the entire Upper Peninsula. My office is
located at the MSU Upper Peninsula Tree Improvement Center near
Escanaba. The Center is the headquarters for three MSU Forestry
properties in the U.P. with a combined area of about 4.000 acres. A
collection of these newspaper articles, back to July 1997, can be viewed
on the following website: www.michigansaf.org under the "Forest Info r"
button.
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