It probably was of little interest to Tolkien - we also don't hear much about infrastructure and economic methods in other realms, though they clearly existed beneath the surface of the story we read, or else how could the Rohirrim buy bridles or the residents of Minas Tirith be supplied with wood or coal?
Tolkien, it should be noted, likely wasn't much interested in such things in real life; it's shocking to modern ears, but he had a wife to take care of making sure there was bread in the pantry. It's also worth noting that the cutting off of supplies or destruction of resources doesn't figure highly in the depiction of warfare in LotR. Only Saruman seems to have this in his store of tactics.
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Gordon's alive!
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