usig this rule

If a power or ability is countered or lost, all game effects of that power or ability immediately end, but any actions already in progress are resolved normally.

This mean if i lose smoke cloud or barrier the marks are gone or stay?, i remember a rule sayin they dissapear but i cant found it u.u

And this make me thing in 2 other things Poison Ivy NML4 if sh die what happend with the objects she made, and spiral new power if she die the gateaway stay?

They go away. Anything created by a character usually goes away when they are KO'ed, unless a power/ability specifies otherwise.

Do you have the exact line of the smoke cloud and barried? because i read they remains in game till the begin of your next turn, thats make me think u.u

And ok about the plants and gateaways

Your first post quotes the exact line from the rulebook on why Barrier or Smoke Cloud would go away if the figure is KO'ed.

So what happens if i give to my clix a 2nd action token to use Barrier and after that when it takes pushing dmg he loses barrrier ability... ? Barrier disapear?

Yep. So don't push to use Barrier or Smoke Cloud unless you know your characters dial.

Yes. If Barrier is lost then any tokens placed by it are removed.

What about this one from Terra, where it says it stays until destroyed, would that keep then on the map when she dies? Doesn't seem quite clear.

WALL OF STONE: Give Terra a free action and place up to 2 blocking terrain markers within range; these markers remain on the map until destroyed or until Terra uses this ability again. When Terra is adjacent to one of these blocking terrain markers, she can use Toughness.

No, because the effect does not specifically say that the markers will remain even if she is KO'd.

they dont say that about being KOd, but they do say they stay until they are destroyed or she uses the power again. Doesnt say " or is KOd"

But once Terra is KO'd, the effect of her trait ends, so there is nothing keeping the markers on the board anymore and they will be removed.

If you're KO'd, the power isn't showing anymore. Therefore, it is lost.

Can barriers be destroyed like walls?

Yes. ........

Better yet, they can be destroyed like blocking terrain. Destroying walls has the added requirement of sharing a side with the square the character is in. Destroying blocking terrain requires only adjacency.