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they do so bcoz their communities were hugely effected by shifting cultivation... they were nt settled..! they changed places when they found d resources in shortage.. n forests r considered as best sources...! forests has plants, grass where they can graze their cattle.. fresh air.. & water ... they did cultivation.. so they used nearby water.. ie water frm ponds, lakes, rivers., etc... nt only dis.. dey collected forest products n then sell dem...! they also used forest products like fruits n many other commodities for their survival.. so, as far as forests were totally beneficial n provided as gud sources...! dey often lived on d edge of forests...!
hey.. i only remember dis frm 9th class :P.. so, i put on everything i remember.. dnt knw if it's gud/...!
bt still i tried n hope it's right.....:) :)