Yes, but it still doesn't affect the (rational) landowner's decision. Imagine an improvement that can net the owner $Y a year in profit. A rational owner should always make that improvement, regardless of whether the government is also taxing them $X a year on the land.
If they doesn't have the money/capital to do so, they should sell the land to someone else. Obviously not every landowner acts fully rationally, but in the aggregate, landowners should act pretty closely to that model.