Dirtmechanic
Garden Addicted
Now that you mention it, one of the most fascinating descriptions I have ever heard related to soil was one of fungi using some form of mycelium to extend into a hostile pH area an snare bacteria. I am a geek I know.life is a stew and most of that stew likes to cook around the neutral/central part of the pH scale. DNA/RNA are acids after all. as you get off towards either side of the pH scale life becomes less diverse in numbers and the ability to cope with the harsher environments. i'm not sure what the far extremes might be as life can be pretty creative, but i do know that it sure isn't as varied or productive at those extremes. when your environment isn't hospitable/easy then you have to spend more energy on defenses instead of living on easy street. the more defenses you have to put up the harder it becomes to procreate... this is the boundary issues all systems have from organisms to social groups.