Growth is the increment of the body size. Nutrients are essential for growth, reproduce and development for organisms. Therefore trees are also required nutrients for it growth. Tropical rainforests are comprised of evergreen trees which do not shade their leaves seasonally but their older leaves do. After leaves and branches falling, they are quickly decomposed by bacteria, fungi, termites and earthworm in the forest floor. Rate of the decomposition is also high under the favorable conditions, high temperature and high moisture. As a results of high temperature, water is transpiration but water vapors are hold by the canopy cover therefore humidity of the forest is high.
As soon as decomposition, nutrients are absorbed by trees. They have buttressed trunks and shallow roots which are extensive in order to absorb nutrients from within large area. Therefore most of the nutrients remain in the biomass of the trees rather than soil. Trees are cut down and removed from the forest land for cultivation. After cultivation, nutrients which remained in the soil is also removed from the land, therefore there is no way to add nutrients to soil like earlier decomposition. Therefore once trees are gone, nutrients are also gone. Therefore cultivation in the rainforest land is less efficient. Tropical rainforests are considered as “wet dessert”.
Distribution of the tropical rainforest of the world
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