Check out this article, I found it really interesting:
http://blog.ted.com/2014/05/09/shubhendusharma/
Summary of article:
Shubhendu Sharma runs a company that plants mini-forest ecosystems that grow into self-sustaining forest quickly. Sharma uses an accelerated method that helps the forest develop quickly. In the article he describes his method as having six steps:
1) You start with soil. We identify what nutrition the soil lacks.
2) We identify what species we should be growing in this soil, depending on climate.
3) We then identify locally abundant biomass available in that region to give the soil whatever nourishment it needs. This is typically an agricultural or industrial byproduct — like chicken manure or press mud, a byproduct of sugar production — but it can be almost anything. We’ve made a rule that it must come from within 50 kilometers of the site, which means we have to be flexible
4) We plant saplings that are up to 80 cm high, packing them in very densely — three to five saplings per square meter.
5) The forest itself must cover a 100-square-meter minimum area. This grows into a forest so dense that after eight months, sunlight can’t reach the ground. At this point, every drop of rain that falls is conserved, and every leaf that falls is converted into humus. The more the forest grows, the more it generates nutrients for itself, accelerating growth. This density also means that individual trees begin competing for sunlight — another reason these forests grow so fast.
6) The forest needs to be watered and weeded for the first two or three years, at which point it becomes self-sustaining
The use of dense packing and competition is an interesting idea. Imagine every parking lot with its own forest, cool!
Here is a Ted talk by Sharma:
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