I don't do this myself but many organic gardeners lay corrugated cardboard on top of the soil and then pile their mulch on top. They say that this really conserves moisture, helps build the soil and that the earthworms love eating the cardboard. You can Google lasagna gardening to read about layering methods.
I sort of tried this one year and didn't like it but I'm told that my mistake was in not wetting the cardboard really well before adding the mulch on top. Now I just mulch heavily with straw and am very happy with this method. I have clay soil here.
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