Forest Stewardship

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Forest Stewardship Basics of soils Rob Harrison,
Professor of Forest Soils College of Forest
Resources University of Washington Seattle, WA
98195-2100 http//www.forestsoils.org/ForestStewa
rd/
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Forest Land Stewardship includes a faith in the
future, and that what you do today will benefit
and be enjoyed by people a long time from now.
To quote Aldo Leopold "We abuse land because
we regard it as a commodity belonging to us. When
we see land as a community to which we belong, we
may begin to use it with love and respect." "A
thing is right when it tends to preserve the
integrity, stability and beauty of the biotic
community. It is wrong when it tends
otherwise." If you think you're owning forest
land for the money, you may want to think again.
However, many people should be able to pay the
cost of owning their land (taxes, etc.) and enjoy
some financial benefit from the land by growing
and selling trees. That may not be among your
goals, and often isn't, but it is a very worthy
goal for many landowners.
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Tree growth expression is a factor of 1) Tree
genes 2) environment, including edaphic, or soil
factors An Edaphologist focuses on the soil as
a habitat for living things, particularly plants
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Soil provides (or doesnt) 1) physical
support 2) air, CO2 to green, O2 to roots 3)
water 4) temperature moderation 5) protection
from toxins (buffering) 6) nutrient
elements Often not included Home for
plant-beneficial organisms (mutualists)
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That said. Trees do NOT need soil to get any of
those Trees can grow without soil However, if
that was the case, what would the poor soil
scientists do? Also important, though some of
the processes of soil formation create better
conditions for plant growth, many dont, and soil
development doesnt necessarily coordinate with
optimizing plant growth.
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A typical elemental content life of granitic soil
development
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RobHarrisonwhole soil structure texture
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Ectomycorrhizae
Endo- mycorrhizae
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N Cycle of 38-y old DF (Wash State) vs. 22-y-old
Eucalyptus grandis plantation, S. Brazil