The wood chip mulch will provide moist soil and will provide lots of food for beneficial critters and fungi in the soil and most importantly around the root system. Earthworms love such environment and will make sure the soil is well aerated under it. Mulch will also decompose with time enriching the soil with nutrients and will also supress the weeds from growing in that area which would only deplet the soil's nutrients.
NOTE!!! Never ever dig the wood chips into the ground. This will encourage anaerobic bacteria which will take up all the Nitrogen. Only cover the soil with 5-10cm of wood chip.