CAUSES OF SUCCESSIONS 



455 



shallow, salt, or brackish water in a warm-temperate climate, 

 while the remaining portion supports in places a most luxuriant 

 growth of land plants. Year by year, along the margin of the 



' 





$pH ; ',.&; Sv*H; 



&lf 





FIG. 350. Aspen succession after forest fires in coniferous woods, Colorado 



After Clements 



submerged part of the delta, as this emerges from the water, 

 the -change from aquatic to land vegetation goes on, and year by 

 year the flora which first establishes itself in the newly emerged 

 mud is succeeded by others more adapted to ordinary soil. 



