Well if you're asking what I have actually argued for in such circumstances and yes I have and am writing 10yr and longer tree management plans for park areas very high profile...the tree owners have to decide what they really want..trees or turf...long term you will be very hard pressed to keep both in anything like pristine conditions.
Vertical mulching is an option together with drenching the soil with a suitable compost tea suitability decided by quality tests that can be assessed. But ultimately without the carbon input (mulch) you're just giving CPR to a critically ill patient (for want of a suitable analogy) you can't sustain it long term you have to provide the Carbon, for many more reasons than just the organic chemistry.
Read through this little piece by someone we might remember?
TreeHelp.com: Features: Troubles in the Rhizosphere - Part 1