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Wy a few gpercenk of the nutrient uptake of trees, often less than 1C$,
is retained in the trunk, and this is approximtely the same as nutrient
amountc in preaipitation,
to 4 ~ 9 of ~ those 2 in trunks of 1;he min trees.
Brush timber contains nutrients equivalent
Timbt-1~ extraction
therefore removes only a smil fraction of the annual nutrient kcom
to a site, but, nevertheless, removes muck nore - for some nutrient:
mom than ten times more - than that removed h the minal crop,
To summarize the above, the ckzractefistics of soils under different
land uses and rnanagernerrts often differ mrkedly as a result of the use
or mnagemnt.
ahen use and ~nagement are altered, soil changes occur
as natural adjustmeats of the ecosystem t o the factors applied.
These
changes rarely load to severe deterioration in soil quality, or to soil
erosion, unless changes hax been made suddenly and without ca,wf'ul
planning.