I tend to agree with BiologyBill,
Moira Wilson of the University of Manchester has developed a ceramic dating technique
which sounds perfect to draw an exact time line of TP development year over year.
At an accuracy of years we could see the speed at which the system built on itself once initiated.
Archaeological dating by re-firing ancient pots - physicsworld.com
My reviews of the agronomic field trials & literature using Biochars clearly show consistent positive effects in temperate & tropical soils, what is not known, and in debate, are some of the mechanisms for the "black box" nature of biochar effects : MYC / AMF & microbe refuge theory, Glomalin soil aggregation & water films, microbial mats & quorum sensing, expansion of aerobic soil horizons & suppression of the anaerobic. As a feed ration for livestock & aquaculture; http://superstoneclean.com/video-presentations/
and the most startling, plant chemical signaling for expression of dormant genetic traits.
I sent DuPont work with heavy metals last year which initiated field trials Hg showing a 95% reduction of food web uptake! Their lab bench results showed good binding, but did not hit 95% reductions until the in situ study with the full complement of microbes, fungi and the bioturbation's of macro fauna.
This same problem remains for explanation of the mechanisms of other char applications, The internal biology changes when char is used as a feed ration, The role of Phosphorous chars for both plant availability and an heavy metal binding remediation techniques. The intricacies of fostering increased aerobic conditions into deeper soil horizons, I'm just so glad we have all these positive affects that tantalize
researchers and will build funding support to answer the mechanism questions.
What the CFC / Ozone success story was for raising the importance and attention to atmospheric chemistry, I feel biochar soils will be for carbon soil chemistry, Mycology and Microbiology.
So Much work to be done,
The Terra Preta Prayer
Our Carbon who art in heaven,
Hallowed be thy name
By kingdom come, thy will be done, IN the Earth to make it Heaven.
It will give us each day our daily bread and forgive us our atmospheric trespasses
As we forgive those who trespass against the Kyoto protocols
And lead us not into fossil fuel temptation, but deliver us from it's evil
low as we walk through the valley of the shadow of Global Warming,
I will feel no evil, your Bio-fuels and fertile microbes will comfort me,
For thine is the fungal kingdom,
and the microbe power,
and the Sequestration Glory,
For ever and ever (well at least 2000 years)