PLANT SUCCESSION 



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FlG. 103. An illustration of relatively rapid secondary succession. The 

 fire that destroyed this Oregon forest (above) did not appreciably affect the 

 soil organic matter and was not followed by erosion. As a result, Douglas fir 

 soon became established and, when fourteen years old, formed a closed stand 

 10 to 15 feet tall (below).— U. S. Forest Service. 



many of the effects of previous vegetation upon the habitat are 

 eliminated, resulting in a slow vegetational development. After 

 wind throw or lumbering, many of the products of community 

 reaction remain and succession is rapid. If seedlings and young 

 trees are not destroyed, progress of succession tends to exceed that 

 of the original trend. 



