It would become a forest.
"Glade" might be the word you're looking for. There are also a number of similar terms.
A large increase in herbivores. In a few decades there could possibly be a large decrease in vegetation. Though I'm not sure on the last part.
If the producers happen to be large trees, they can be small in number but still have a large biomass, therefore allowing them to support a community of more consumers.
Chaos, large masses need to be regulated in some way.
It might support large shellfish fisheries as well as acting as nurseries for young fish.
I think it would be more humid not much would happen i guess.
the birds will die
they will incresa
magnetron
they will all die (or get cooked)
they will all die (or get cooked)
The sun would be cooler