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plant use of CO2 vs diffusion into the air (Was: C02 problems)

 > > From: George Booth
 > > I wonder if any of the scientists among us have any info on how much CO2 
 > > plants 
 > > use when they are strongly photosynthesizing?  I have evidence of how fast
 > > it 
 > > diffuses into the atmosphere.   
 > From: eworobe at cc_UManitoba.CA
 > In eutrophic, productive systems with hardwater macrophytes can almost 
 > completely remove the dissolved CO2 during a sunny day. The result is a 
 > pH of around 9.5 to 10.0 and an almost complete removal of calcium from 
 > the water column (a drop from about 60 to 0 ppm in some lakes that have 
 > been measured). Dont underestimate the ability of aquatic plants to 
 > remove CO2 from your tank... on the plus side, most tanks are so poorly 
 > lit that this is not a problem.

 > From: "Roger S. Miller" <rgrmill at rt66_com>
 > [...]
 > The C fixation rate is in nanomoles per square meter of plant surface per 
 > second.  The list covers quite a variety of plants, and it looks to me 
 > like their fixation rates can be ranked as:
 > coral > surface-attached plants > rooted plants > plankton
 > The plankton average 450.  Rhizophytes (rooted plants) average 1,967.  
 > Haptophytes (surface-attached plants) average 3,218.  The one coral on 
 > the list was 5,220.

I'm no real Scientist (or Biology consultant for that matter =:)
but I suspect that the plant surface area in my 55 gal tank filled
with plants is pretty small relative to the eutrophic systems
eworobe at cc_UManitoba.CA speaks of.

Perhaps some very kind, scientifically motivated person will
post to this list re the ~ 2000 nanomoles per square meter of
plant surface per second for rooted planks figure, a guessimate
of the m^2 plant surface in, say, a heavily planted 55 gal tank,
and their conversion into C02 utilization in ppm in a tank?!

It would be interesting to validate George's idea with some
scientific hand-waving, imo.

goin' home through 4" of snow on a 6" base...
- - - - -
Steve Rader
Network and Systems Manager
WiscNet--Internetworking for Wisconsin