If you're not backpacking with the camera to get to the locations, you don't need to worry as much about portability, and none of those subject require very extensive movements, unless you plan to do some still life at harvest time (and even then, it's not absolutely necessary, but a monorail with lots of movement capability will give you more creative choices). Basically any camera that doesn't leak light, locks down tightly, has basic movements, and fits your budget will do. You could start with a 150mm lens (again, any 150/5.6 lens made since the 1970s) and maybe a 90mm (a 90/f:8 Super-Angulon is versatile and not too expensive), and those will cover most landscape situations.
If you're going to travel with the camera by plane, though, a folding wooden camera like a Tachihara, ultralight Ikeda Anba, Chamonix, Shen-Hao, Wista, or if you like metal a Toyo, Horseman, or older Linhof Technika might be a better choice with today's restrictions on baggage.