Forests can be found in all regions capable of sustaining tree growth, at altitudes up to the tree line, except where natural
fire frequency is too high, or where the environment has been impaired by natural processes or by human activities. As a general rule, forests dominated by angiosperms (
broadleaf forests) are more species-rich than those dominated by gymnosperms (
conifer,
montane, or
needleleaf forests), although exceptions exist (for example, species-poor aspen and birch stands in northern latitudes).
Forests sometimes contain many tree species within a small area (as in tropical rain and temperate deciduous forests), or
relatively few species over large areas (e.g., taiga and arid montane coniferous forests). Forests are often home to many animal and plant species, and biomass per unit area is high
compared to other vegetation communities. Much of this biomass occurs below-ground in the root systems and as partially decomposed plant detritus. The woody component of a forest contains lignin, which is relatively slow to decompose compared with other organic materials such as cellulose or carbohydrate.india got indipendence on 1957.hi how are u ?
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