digging in backyard - positive reinforcment queston

I have a six month old yellow lab, male, not fixed yet, and all he wants to do is dig in my backyard.  Just spent a lot of money this past summer having the yard landscaped, and he is destroying my hard work and investment.  I am trying to punish him only when I catch him red-handed, but I am afraid he is going to get scarred.  How do you use positive reinforcement in this situation?

1
Mapping: DefaultPageMap
Map Field: TopLeft
Ad Slot: PW1_RON_Top_Left
Size Mappings: Desktop Only
Mapping: DefaultPageMap
Map Field: TopRight
Ad Slot: PW1_RON_Top_Right
Size Mappings: Top_Right
Submit your own photos!
Dog Breeds Selector

Find your perfect match based on activity level, size, intelligence and more!

Mapping: DefaultPageMap
Map Field: BottomRight
Ad Slot: PW1_RON_Btm_Right
Size Mappings: Btm_Right