The highest net primary productivity in terrestrial surroundings occurs in swamps, marshes, and tropical rainforests.
Primary productivity is the rate at which energy is changed with the help of photosynthetic and chemosynthetic autotrophs to organic substances. The total amount of productivity in a region or an area is gross primary productivity. A certain amount of organic material is used to contain the life of the producers; what remains of the process is called net productivity.
Net primary production is what is not used by plants and available for secondary production is called net primary productivity.
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