Fwd: [NatureNS] Red Herring & Forestry

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To: <naturens@chebucto.ns.ca>
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Date: Sat, 9 Jan 2016 17:44:15 -0400
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Hi Paul & All,                    Jan 9, 2016
    Yes Paul it does but the atmospheric average does not bear =
faithfully on CO2 near the ground where plants grow.
    I have not looked at this in many years so dates are approximate and =
details may be a bit scrambled. In about 1925 someone tested the idea =
that increasing CO2 in a greenhouse would increase growth rates. =
Contrary to expectation it decreased rates.=20
    Much later it was discovered that the apparatus used to generate CO2 =
was also generating a byproduct (ethylene I think) which decreased =
growth. When this was removed the growth rate increased as expected.     =
I think somewhat elevated concentrations of CO2 are (or were) used =
commercially for the purpose of increasing growth. If it is raised too =
high things get out of wack.
    In the early 50s I read a copy of Geiger; The Climate Near the =
Ground. published 1913 ? He had assembled a huge amount of information =
on gradients of CO2 near the soil surface and at modest heights above =
it; all in calm air conditions. At night this is partly due to nearby =
plants (CO2 is heaver than air I think) but mostly it is due to soil + =
root respiration. Low plants like Violets probably benefit from this.=20
    Recently, probably 80s, CO2 and temperature up to 12 Metres above =
field crops was recorded at various heights to enable modeling of =
photosynthesis.=20
   =20
    Another entirely different case shows how interpretation of =
observations can be tricky. Someone noticed that a small zooplankton, =
raised in a room that was isolated from daylight, started to go into a =
reproductive phase at the same time each year. Clearly it had some =
built-in biological calendar and turned on the juice when the right day =
arrived.=20
    Quite a few years later this was found to be due to some chemical =
that was produced each year (perhaps by the same zooplankton) at the =
same time in the local reservoir and not removed during treatment. =
Details may be scrambled a bit but this is the basic story.=20

Yt, Dave Webster
   =20
  ----- Original Message -----=20
  From: rita.paul@ns.sympatico.ca=20
  To: naturens@chebucto.ns.ca=20
  Sent: Saturday, January 09, 2016 11:35 AM
  Subject: Re: Fwd: [NatureNS] Red Herring & Forestry


  =EF=BB=BF I couldn't agree more Dave!=20
  One thing I always wondered about was CO2 and food production.=20
  Seems its essential for to grow food - does increasing the CO2 level=20
  increase the yield of crops? the growth rate of trees?=20
  Enjoy the winter=20
  Paul=20
  =20
    On January 9, 2016 at 10:00 AM David & Alison Webster =
<dwebster@glinx.com> wrote:=20


    =20
      ----- Original Message -----=20
      From: Nicholas Hill=20
      To: naturens@chebucto.ns.ca=20
      Sent: Friday, January 08, 2016 12:01 PM=20
      Subject: Re: Fwd: [NatureNS] Red Herring & Forestry=20
      =20
      "when we cut the forest and ploughed our prairies, we never knew =
what we were doing because we never knew what we were undoing" (Wes =
Jackson citing a Wendell Berry letter)=20
      <snip>=20
      Hi Nick & All                                        Jan 9, 2016=20
          With reference to the above quote, I assume you will agree =
that those who preach should be prepared to live within the confines of =
their sermon.=20
         =20
          In this case, in justice to those pioneers who risked all and =
endured hardship for a shot at a modest slice of "Freedom from Want and =
Fear" would it not be appropriate, for those who spread or accept this =
view, to dispense with clothing, live under a rock and eat sow bug =
dropping ?=20
      =20
          Surely you will also agree that it is unseemly to denigrate =
those long dead and especially unseemly to feast at the banquet which =
they made possible while doing so.=20
      =20
      Yt, Dave Webster, Kentville=20

   =20
  No virus found in this message.
  Checked by AVG - www.avg.com
  Version: 2016.0.7294 / Virus Database: 4489/11362 - Release Date: =
01/09/16

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<DIV>Hi Paul &amp; All,&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; =
&nbsp;&nbsp;&nbsp;=20
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; Jan 9, 2016</DIV>
<DIV>&nbsp;&nbsp;&nbsp; Yes Paul it does but the atmospheric average =
does not=20
bear faithfully on CO2 near the ground where plants grow.</DIV>
<DIV>&nbsp;&nbsp;&nbsp; I have not looked at this in many years so dates =
are=20
approximate and details may be a bit scrambled. In about 1925 someone =
tested the=20
idea that increasing CO2 in a greenhouse would increase growth rates. =
Contrary=20
to expectation it decreased rates. </DIV>
<DIV>&nbsp;&nbsp;&nbsp; Much later it was discovered that =
the&nbsp;apparatus=20
used to generate CO2 was also generating a byproduct (ethylene I think) =
which=20
decreased growth. When this was removed the growth rate increased as =
expected.=20
&nbsp;&nbsp;&nbsp; I think&nbsp;somewhat elevated&nbsp;concentrations of =
CO2 are=20
(or were) used commercially for the purpose of increasing growth. If it =
is=20
raised too high things get out of wack.</DIV>
<DIV>&nbsp;&nbs