Disjunctive high elevation (island) forests probably have the same current climate, same substrate (lithology) and the same post-glacial vegetation history. For the phenomena see my endemics article (although herbs in this case); however, in the same area we see the phenomena also with woody formations.

I extend my sense of gratitude to both of you specially Abhishek to provide me the link which helps a lot to find the reason in real, thanks to both of you once again.

Sunit

See also Statistical research :

for ex. 

Dupont, Vicky 2011.

Statistical analysis of the spatial symmetry of periodic vegetation patterns in semi-arid lands - exist resumé de la thèse

http://www.secheresse.info/spip.php?article20534