Ally Cropping provides about 75% as much grain as a standard field with other harvests available at other times of the year, an agroforest has lots of small harvests that provide food in the long term for small communities.

The forest provides habitat for edible wildlife, and fungus that store up calories over time

The other thing is that a mature forest produces a larger harvest the an annual field becuse of the larger photosynthetic surface. The trees are big and tall they catch more light from less space and create a matrix to grow food. Kinda like a tent compared to a sky scrapper.