Guild: Wheat + Alder?

Reading a lot of fascinating stuff about Black Alder, Alnus Glutinosa. I was thinking, if I plant a small forrest of Alder trees, and use this land for cereal production, especially wheat, I might have solution for a lot of my problems, but do I get some new problem that I did not think about?

Wheat should make most of it's growth in the spring, when Alder is still without leaves. When Alder comes to leaves, I can harvest wheat, and what is the best, I work in the shadow that Alder brings. I leave straw mulch where it is to protect Alder from drying and from weeds, if it matters. In the autumn, Alder drops a tons of excellent manure. But meanwhile, bacteria in Alder roots is fixing nitrogen becouse Alder is nitrogen fixing plant. Before winter I sow new wheat, maybe only under the heavy mulch of straw and leaves.

Does this looks to you sustainable for a number of years? Am I missing something?

It seems a good idea, take a look at agroforestery books,

A. glutinosa likes wet soils, maybe switching for A. cordata is a better idea depending on your weather conditions ?