Sentence 1: Particularly strong erosion occurred in warmer melting periods during the ice ages , when the climate of the tundra reigned and the soil was not protected by a dense vegetation ceiling .
Sentence 2: Particularly strong erosion occurred in warmer melting periods during the ice ages , when tundra climate reigned and the soil was not protected by a dense cover of vegetation .
Question: Do Sentence 1 and Sentence 2 express the same meaning? Yes or No?