length of harvest cycles

K N and P J Harris ecoli at cix.compulink.co.uk
Thu Jan 4 14:10:46 EST 1996


> ==========
> bionet/mycology #783, from rexs13 at teleport.com, 2702 chars, Wed  03 
Jan 1996 01:17:45 -0
> ----------
> Article: 2818 of bionet.mycology
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> From: rexs13 at teleport.com
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> Subject: length of harvest cycles
> Date: Wed, 03 Jan 1996 01:17:45 -0800
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> Aside from other considerations such as erosion, here is my argument 
for
> lengthening timber harvest cycles. The following paragraph is based 
soley
> on my experiences and my interpretation of information available from
> various sources (find out about Dr. Andrew Moldynke's work on 
microscopic
> arthropods from OSU entomology dept.):
> As mycelium forms mycorhizal relationships with the roots of the trees 
and
> these relationships are necessary for continued forest, soil, and tree
> health, these longer harvest cycles are important to insure continued
> forest (and tree) health as some species of fungi do not appear until 
the
> trees are several decades old. The individual trees derive immediate
> benefit from these relationships by having increased nutrient uptake 
and
> availability. I can tell upon entering a stand of trees if their are a
> large number of truffles in the stand by the health of the stand and
> appearance of the individual trees. It appears to me (although I do 
not do
> comparative soil tests for nutrients, ph, etc. to rule out other 
factors)
> that the trees with the beneficial mycorizae grow faster and the 
stands of
> trees are healthier. The long term benefits from these relationships 
are
> less apparent to the casual observer. Soil is formed by fungi-eating
> arthropods, both macroscopic and microscopic (don't smash that
> millipede!!!) and it is probable that some of these mycophages are 
fungi
> specific. If the fungi that they require does not grow well in the 
very
> young trees and only grows in association with older trees or, as is 
the
> case with several saprophitic fungi, on dead trees, then a neccesary
> component of the soil may not be produced. I somehow cannot get the 
mental
> picture of the log trucks hauling away loads of soil from Gravel Creek
> (Siletz drainage) by moving the small trees to the GP mill for 
chipping. 
> Am I the only person to have reached this conclusion?
> If I am mistaken in any of these points, which ones?
> If nothing else, this should provide medium for thought.
> Rex Swartzendruber
> 
> For pictures of some Tuber gibbosum and Picoa carthusiana go to
> http://www.teleport.com/~rexs13.
A bit over the top with "soil is formed....."
Soil is formed from parent material by the actions of microbial 
populations, the inputs of plants, the climate, the topography and time.
Sure, arthropods are important in some situations but not all.

Peter Harris,
Soil Science Dept,
Reading Univ. Uk.
aka P.J.Harris at reading.ac.uk




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