The first is called "extractive reserves", which sounds a bit contradictory. The idea is to allow selective and sustainable extraction of certain resources while preserving the ecosystem as a whole. Read more about extractive reserves here at World Watch Institute.
"Intercropping" is another idea that looks great. By planting certain species of trees alongside staple crops, nutrients are retained in the soil, significantly increasing yields. Read about tree intercropping here at SciDev.net.