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Hi All, Jan 13, 2016
My memory may be incorrect but, according to it, hardwood was being =
chipped in Guysborough Co. for export to Europe by 1990. If not that =
early then at least for a substantial time.
Does anyone know the history of chipped wood exports and how healthy =
or unhealthy the regrowth has been from those harvested in the first =
five years ?
I think it would be impossible to build all of the nuances and =
subtle readjustments of soil-climate-plant relationships into a model =
and understandably the Noseworthy version, so far as I can see, made no =
attempt to do so.
Podzols have a very high weathering rate for a good reason. =
Weathering can be represented by the general equation--
Mineral + H+ > Cation =20
and the rate of the forward reaction will be increased by leaching. =
Plants do not absorb nutrients in proportion to their concentration in =
soil solution [selective absorption of nutrients was documented by about =
1930]. If Ca were to become limiting then one would expect decrease of =
Ca in the soil solution which would force the weathering reaction of Ca =
containing minerals.
That being said, the Noseworthy thesis if useful with respect to =
aspects which are less affected by subtle readjustments. There are good =
tabulations of nutrient content of various species and an array of =
graphs which portray nutrient removal under various harvesting =
scenarios.=20
One important message generated by this model, when combined with =
common sense, is that it would be unwise to harvest the entire top for =
biomass. Harvesting should remove only stems and leave branches and tops =
for a variety of reasons nutrient removal being one of them.
Yt, Dave Webster, Kentville
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<STYLE></STYLE>
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<BODY>
<DIV>Hi All, =20
=
=20
=
=20
Jan 13, 2016</DIV>
<DIV> My memory may be incorrect but, according to it, =
hardwood was being chipped in Guysborough Co. for export to =
Europe by 1990.=20
If not that early then at least for a substantial time.</DIV>
<DIV> <FONT color=3D#ff0000>Does anyone know the =
history of=20
chipped wood exports and how healthy or unhealthy the regrowth has been =
from=20
those harvested in the first five years ?</FONT></DIV>
<DIV> </DIV>
<DIV> I think it would be impossible to build all of =
the=20
nuances and subtle readjustments of soil-climate-plant relationships =
into a=20
model and understandably the Noseworthy version, so far as I can see, =
made no=20
attempt to do so.</DIV>
<DIV> </DIV>
<DIV> Podzols have a very high weathering rate for a =
good=20
reason. Weathering can be represented by the general equation--</DIV>
<DIV> Mineral + H+ > =
Cation =20
</DIV>
<DIV>and the rate of the forward reaction will be increased by =
leaching.<FONT=20
color=3D#ff0000> </FONT><FONT color=3D#000000>Plants do not absorb =
nutrients in=20
proportion to their concentration in soil solution [selective =
absorption of=20
nutrients was documented by about 1930]. If Ca were to become limiting =
then one=20
would expect decrease of Ca in the soil solution which would force =
the=20
weathering reaction of Ca containing minerals.</FONT></DIV>
<DIV> </DIV>
<DIV> That being said, the Noseworthy thesis if useful =
with=20
respect to aspects which are less affected by subtle readjustments. =
There are=20
good tabulations of nutrient content of various species and an array of =
graphs=20
which portray nutrient removal under various harvesting scenarios. =
</DIV>
<DIV> </DIV>
<DIV> <FONT color=3D#ff0000>One important message =
generated by=20
this model, when combined with common sense, is that it would be =
unwise to=20
harvest the entire top for biomass. Harvesting should remove only =
stems and=20
leave branches and tops for a variety of reasons nutrient removal being =
one of=20
them.</FONT></DIV>
<DIV> </DIV>
<DIV> Yt, Dave Webster, Kentville</DIV>
<DIV> </DIV></BODY></HTML>
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