A secondary forest is a forest in which a number of intolerant trees have grown in the secondary transition process. 40% of Japan's forest is secondary forest. It often exists very close to human habitation. For example, copse and brush are categorized as secondary forests, and as such have often been the target of continuous deforestation.
When deforestation discontinues, the transition progresses, and eventually, intolerant trees are taken over by shade bearing trees, thereby becoming a climax forest. This phenomenon is not considered problematic in and of itself, but bears the risk of sacrificing the animals and plants in particular to secondary forests. It is also suggested that the forest's resistance to rain and wind decreases.
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