Teaming with Microbes is a great place to start reading about such a topic. Microbes are constantly dieing, propagating, hibernating, fighting and eating but you learn more than reading the book I referenced. My best advice, as this has been credited to many others, that I've heard this from, is to simply "observe nature". I find that most real quality organic books discussed in thread has a pretty clear message especially One Straw Revolution. "observe nature" Mulch: Cannabis leaves, straw, coco chips, wood chips, all make for a fine mulch. Even sand in a pinch.