I read that ISFPs and ESFPs may have a strong connection to the nature, animals, and even babies, and both use Fi. But I guess it only applies to them, I don't know. I don't have this. No aspect of Fi in my knowledge have any relations with strong connections with nature.
I have a strong connection to nature and have noted quite a few INFP's do as well. Functionally I'm not sure exactly how this would tie in, but it seems like being away from people, appreciating the beauty and harmony, having time to just dawdle and reflect with no pressing issues or deadlines could be very fi-oriented. I'm sure fi isn't the only function that would appreciate it, but I can see how Fi would find value in the harmony, purity and authenticity.
Man suffers only because he takes seriously what the gods made for fun - Watts
Nature has a collective and responsive conduct and order to it. So wild yet purposeful. Nothing is cruel in nature, for everything that seeks its own survival assists everything else in the system. So as an Fi dom, that unspoken value for everyone and everything with the individual's aims ultimately benefiting nature hits home.