This isn't the case. Land value taxation, since it would reduce the profitability of holding land without using it, would decentralize land ownership, allowing a greater number of parties to participate in this decision making process. The market's level of efficiency would, no doubt, be aided by that process. In a more open market, it is not the government or a few privileged individuals who would decide land use, as it is with the current tax policies. With the participation of more potential land owners, market efficiency would increase, not decrease.
Lumber is a resource.
Actually, though, this may be where your confusion lies. Well, perhaps, your instructors were Neo-Classical economists. They, like Marxists, assert that labor and capital are the basic factors of production. So, in the case of lumber, it is produced out of resource. It isn't a resource, then, but a product.