Rain forests, temperate forests, grassland, and deserts—all are immense developments of plant societies depending upon climatic differences for their occurrence. There are some other plant communities which also depend for their development on still other differences of climate. Two such are the vegetation of mountain tops in the tropics, and that strange tundra vegetation near the poles which lives all its life on the ice, only the roots and soil in which it grows thawing out during the brief summer. Temperature rather than rainfall is the cause of these and some other plant societies of more local occurrence. Forests may be found in all stages of succession from those just beginning the process to those final forest monarchs which, having won out in the race, are, until one of them falls, often slow to perpetuate the type.The first chapter gives definition of forest, importance and benefits of forest and decline of forest. The second chapter gives tropical, temperate and grasslands forest.
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