Forum:Spiritual Forest

I don't quite understand Spiritual Forest. Card effect being "Each turn, the first face-up Beast-Type, Beast-Warrior Type, or Plant-Type monster you control that would be destroyed by battle, is not destroyed."

My first question is, is it only the monster I've summoned that turn that cannot be destroyed? As in I would have to consistently summon a monster of that type or just the monster I summoned.

My second question is, if the monster is destroyed and I have another monster on the field, does it take the effect on the next turn?

Thanks in advanced!