I love this. What a way to see not only land but all "possessions." If we are to live in a harmonious way with nature (which seems the best way to survive longterm in the wild), we truly have to enter into a relationship with every "thing," in that we must know how to find it, build it or otherwise obtain it, how to maintain it, how to reuse it if it breaks or wears out or how to compost it. How different that is from our disposable society in which we buy some piece of crap from the big box and then throw it out after one use!
And it seems to be territorial with something that you have a relationship with would seem to be different than something you "possess." Relationships are fluid and you could conceive of bartering, sharing, or gifting under certain circumstances. Whereas possession seems concrete, it's MINE, I've branded my name on it, part of my value as an individual is my possession of certain things.
Also, if I have a relationship to Mother Earth, and someone else comes along, well, they might have a relationship as well, and so I would take that into account. Whereas if it's MY piece of land, then there's no room for anyone else, and another person would just be an intruder/invader.