[Terrapreta] charcoal degradation - uncertainties about its half life

[henry buehler]

New satellite imaging has revealed that hurricanes Katrina and Rita produced
the largest single forestry disaster on record in America — an essentially
unreported ecological catastrophe that killed or severely damaged about 320
million trees in Mississippi and Louisiana. "This is the worst environmental
disaster in the United States since the Exxon Valdez accident ... and the
greatest forest destruction in modern times," said James Cummins, executive
director of the conservation group Wildlife Mississippi and a board member
of the Mississippi Forestry Commission. "It needs a really broad and
aggressive response, and so far that just hasn't happened." "I was amazed at
the quantitative impact of the storm," Chambers said. Of 320 million trees
harmed, about two-thirds soon died. "I certainly didn't expect that big an
impact." Chambers was even more surprised when his team calculated how much
carbon will be released as the storm-damaged vegetation decomposes. The
total came to about 1.1 billion tons, equal to the amount that all the trees
in the United States take out of the atmosphere in a year.
we need to build into our refining capacity the ability to consume trees
again like we did before we drilled for oil.

On 11/16/07, Brian Hans <bhans at earthmimic.com> wrote:
>
> Thank you Andrew and Mariska for bring up this very important topic,
> likely the most important topic that TP should be discussing.
>
> Im not going to cite any ref. material but after a few weeks of discussing
> TP with various soil scientists, it seems that charcoal can infact break
> down over time, organically and chemically. It is also easily lost thru
> erosion and other climate events. I heard serious questioning about the
> perported lifespan of charcoal in the soil. I also heard the term 'priming
> effect' but he didnt have a cite... likely from the one Andrew ref'ed. Tho
> charcoal remains longer than raw bio-mass and has many benefits because of
> that, there is very little longer term data on this topic and definately
> more needs to be done.
>
> To confuse the matter, an activated carbon specialist mentioned to me that
> hardness would likely determine retention time in the soil, which goes to
> the feedstock AND quality of process.
>
> I am convinced that charcoaling is generally better than composting or
> just letting it rot. But just as compost has a 1/2 life in the soil, so does
> charcoal.
>
> Brian Hans
>
>
> *Andrew Zimmerman <azimmer at ufl.edu>* wrote:
>
>
> Mariska - It is generally assumed that charcoal (black carbon) is not very
> biodegradable because of its chemical composition (highly aromatic, with
> relatively little nitrogen, etc) and simply because it remains in the soil
> for long periods of time.  However, recent work (papers attached) has shown
> that microbes can indeed respire and abiotic reactions can breakdown this
> material to at least some extent, especially when more labile organic matter
> is also added (so called 'priming' effect).  In fact, my laboratory has
> found the same and is currently working on defining the properties of
> biochar and its remineralization rates better.  -AZ
>
>
> At 01:21 PM 11/15/2007, mariska evelein wrote:
>
> Hello List
>
> A problem I stumbled across today is the half life of charcoal in the
> environment.
>
> No one seems to have rigorous scientific proof that charcoal is inert, but
> we are all assuming it is.
>
> According to the attached peer reviewed article (new directions in black
> carbon organic geochemistry, masiello, 2004) there are some serious gaps in
> how much black carbon is produced yearly and how much of it we find in the
> environment, suggesting there is either a problem with our scientific
> experiments, or there are other processes that cause a black carbon loss
> that we haven't found out about yet. Even a thousand year life span can't
> explain the carbon quantities.
>
> Does the fact that we find charcoal in our ancient soils mean that this
> represents all the charcoal that was produced at that time? How do we know
> that we are not only finding a fraction of what was once there?
>
> I would really like to believe that most the charcoal we put in our soils
> will stay there indefinately, but am struggling to do so until I find some
> peer reviewed evidence that proofs this.
>
> Can anybody provide me with this?
>
> Mariska
>
>
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>   *___________________________________________* Andrew R. Zimmerman, PhD
>
> Assistant Professor      Department of Geological Sciences 241 Williamson
> Hall P.O. Box 112120 University of Florida Gainesville, FL 32611 Office:
> (352) 392-0070 Fax: (352) 392-9294 azimmer at ufl.edu
> www.clas.ufl.edu/users/azimmer/index.html
>
> "The state of disequilibrium is one from which, in principle at least, it
> should be possible to extract some energy...."                           -
> J.E. Lovelock, Gaia
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