"why are they important? what habitat are they living? what animals eat their seeds? are they important economically? what minerals or grounds they need?" 
I ask you if you could enlarge Dipterocarpaceae making better known this group of trees in Wikipedia, adding links to "Dipterocarpaceae"  and information about  "Dipterocarpaceae" existence on topics as trees articles in tropical articles or botanical or biodiversity articles.  You are welcome if you want edit this article, Lauraceae or some genera or species in these families or another one. Really, there are few knowledge about tropical and subtropical trees and they are so many. I thank you very much your help.