Do Range buffs apply to Powers that affect "a land with your Presence" or "one of your lands"?
No. "A land with your Presence" specifies a requirement for the land you're affecting (similar to, eg, "a land with Dahan" or "a land with Blight"), not a numeric Range. While it is usually the same in practice as "a land at Range 0", when using effects that modify Range the distinction matters.
For powers like Punish Those Who Trespass or Firestorm that have a base effect with normal range and a further effect referring to "lands where you have presence", the range on the base effect can be extended, but the further part cannot.
For instance, if you reach all the thresholds of Punish Those Who Trespass and have extended range, you can use the base effect to deal damage in a distant land and use the further part to deal damage where you have presence (without extension). (Discussion elsewhere) Tags: Range, Presence, Targeting, Reaching Grasp, 10 more...
All other targeting requirements still apply. This includes source restrictions, so if, e.g., a Power must be targeted from a Sacred Site and you have none, Shadows of the Dahan won't let you use it, or if it needs to be targeted from a Jungle, you need Presence in a Jungle to use it. The same applies for target restrictions other than Range, like lands with Invaders, unblighted lands, or restrictions on the target terrain; these must also be obeyed. (Discussion elsewhere) Tags: Range, Targeting, Shadows of the Dahan (Shadows Flicker Like Flame), Finder of Paths Unseen, 3 more...
Remember that if there are explicit instructions about where to Repeat a Power, those take priority. So if a Power Card says "Repeat this Power in an adjacent land", you may (and must) target a land adjacent to the original, rather than choosing a new target the usual way. (Discussion elsewhere) Tags: Repeat, Targeting, Shadows of the Dahan (Shadows Flicker Like Flame)