So there are traditional gardens, forest gardens, etc. Most of the time, when I hear about polyculture gardening, it is referenced either as a food forest or forest garden. I have been wondering if there is another term out there that encompasses more than just forest biomes. I sort of envision a term that covers all varieties of ecosystem mimicry that is bent to favor human habitation (food, medicine, materials, etc) so that while it does include a forest garden, it could just as easily include a prairie style pasture or a human-centric ‘desert’ biome. Does such a term already exist and I am unaware of it or do I need to invent the word for my little project?
I think the broadest term is “edible landscaping,”and in a desert biome it would be an “edible xeriscape.”
The idea you are getting at falls under the umbrella term “bioregionalism.”
Forest biomes are often chosen in areas with sufficient rainfall because they are very efficient for soil building: they can even be achieved in the desert, without irrigation (I recently saw a case study in the Sonoran desert).
People working with agroforestry are in some way attempting to counter-act deforestation: forests are cleared to make grasslands and pasture at an alarming rate, so it makes sense that permaculturists often try and focus on reforestation efforts, and thus forest biomes.
I also have the impression that biomes like grassland, alpine, wetland etc. tolerate less human disturbance, and would be harder to usefully replicate (ie. their animal constituents would be less inclined to live there if humans are present, whereas a forest biome lends itself to domesticated animal husbandry and intense biodiversity). It would be more useful for people to just leave sensitive natural biomes of those types alone.