The forest floor plays a very important part in the rainforest ecosytem. It is home to many organisms and is the place where biomass decomposes. Despite that, though, rain forest soil is very poor in nutrients; the majority of the nutrients are in the plants and leaves.
The leaves of the canopy often make the ground layer of the rainforest a dark and humid place. However, despite its constant shade, the rainforest floor is an important part of the forest ecosystem. The forest floor is where decomposition takes place. Decomposition is the process by which decomposers like fungi and microorganisms break down dead plants and animals and recycle essential materials and nutrients.
Like others mentioned above, the forest floor is home to thousands, if not millions, of species of insects, bacteria, fungi and other microorganisms that process the nutrients held in dead and decaying biomass and help to make it available to other plants. So in this regard, the forest floor is an imporant place for nutrient cycling, leaf litter, branches and trees fall to the ground, and there they decay to only become once again part of the forest system. Soil is also a vast sink for carbon (e.g. carbon is sequestered and accumulates in soil), so it is a relevant piece of the equation of how much carbon can the rainforest sequester. Soil type, topography and geology all impact the hydrology of a region, which can impact water and nutrient availability.
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