The quote I gave didn't link to a Palestinian objecting to non-indiginous trees, but a Rabbi:
The problem is this: "Go Neutral" isn't neutral: many of the forests that Keren Kayemet LeYisrael (KKL-JNF in Israel) has planted are unsustainable single-species plantations, providing little habitat for native plants or animals, and no meaningful offset for your carbon footprint. Even in the best forest, one tree takes 70 years to absorb a ton of carbon according to JNF – but it only takes each of us a year to release 20 or more tons. In the monoculture forests that carbon goes back into the atmosphere much sooner, as other trees die off without reseeding themselves. And there's no way to make sure your money goes to the best forests for the earth: KKL has not yet responded to our request to find out which forests are sustainable and self-seeding.
Rabbi David Seidenberg
http://www.neohasid.org/negev/the_giving_tree2/But, as I said, a better gesture would be to give up land under Israeli Military Occupation (i.e. land not in Israel) - or alternatively, why not donate olive trees instead?
Cheers,
Shafique