"Landscape" is often very different than "nature."
Landscape implies stunning vistas, for which a wide angle, or even ultra wide angle, is helpful.
Nature often implies wildlife -- which may be rather far from the camera, so a good telephoto lens.
I don't shoot with Nikon, but I do use the Tamron 17-50 2.8, which is also made for Nikon. I know Nikon users recommend it as well. That would be a good camera for landscapes. It would generally be wide enough, though some people would want to go ultra wide.
For wildlife, you want as much reach as you can get for a reasonable price, in a lens without it getting toooo heavy. I love the Tamron 70-300 usd, which gives you the equivalent of 450mm reach.