what's your favourite Carbon sequestration scheme? (we are going to need more than one).
What I know, is soil. I have inadvertantly been adding charcoal from incomplete combustion form my woodburner ash to my compost raised beds for 15 years, and always marvelled at the continued fertility compared to bought compost. i had 10 year old compost that was still too fertile for decent seedling compost, where bought stuff was fine on the second year. also the bulk of the beds seemed to reduce only very slowly.
when i came on line 2 years ago, i found out about bio-char and terra preta experiments, and could immediately relate them to my experience. (might well be a bit of comfirmation bias there but whatever).
the theory is, the charcoal lasts for centuries, being a very stable form of carbon. it is also extremely porous, and once 'activated' holds nutrients, trace elements and minerals, and provides a good home for microorganisms, particularly funghi that sperad through the compost or soil and bulk it up with another long lasting carbon form from the mycelium sheath, as well as conecting the roots of plants and creating multiple symiotic relationships.
phew! thats the problem with trying to describe systems, its hard to start and even harder to stop. i'll try draw and post up a diagram when i have time.
Edited by gerda - Sat, 20 Dec 2008 13:57:29 GMT