Define biogeochemical cycles

A biogeochemical cycle is the continuous transport and transformation of materials in the environment through biota, soil hydrosphere (water) and atmosphere (air).It involves the uptake of materials /nutrients from the reservoirs (storage pools) and subsequent conversion of these elements into living compounds and ultimate return to the reservoirs. Most nutrients enter the biogeochemical cycles as gaseous and/or minerals dissolved in water, soil, lakes, streams and seas. Their movement within the ecosystems can be viewed in terms of a food chain. Producers are the initial entry points of inorganic nutrient incorporation from the environment. Over 99% of the energy driving the biogeochemical cycle is derived from the sun which drives photosynthesis and atmospheric-ocean circulation. Other sources of energy

i). The equilibrium Model: This states that an ecosystem always tends towards stability. As soon as the community of an ecosystem is disturbed due to external environmental change, it quickly returns to its original state

ii). The non-equilibrium model: It states that the ecosystem stability is rarely attained because of disturbances caused by frequent external environmental change and do not allow it to develop an ordered state of species assemblage in an ecosystem.
2.2.4Biogeochemical Cycles
A biogeochemical cycle is the continuous transport and transformation of materials in the environment through biota, soil hydrosphere (water) and atmosphere (air).It involves the uptake of materials /nutrients from the reservoirs (storage pools) and subsequent conversion of these elements into living compounds and ultimate return to the reservoirs. Most nutrients enter the biogeochemical cycles as gaseous and/or minerals dissolved in water, soil, lakes, streams and seas. Their movement within the ecosystems can be viewed in terms of a food chain. Producers are the initial entry points of inorganic nutrient incorporation from the environment. Over 99% of the energy driving the biogeochemical cycle is derived from the sun which drives photosynthesis and atmospheric-ocean circulation. Other sources of energy include geological processed such as subduction and uplift (volcanic activities), associated plate tectonics and weathering, physical or chemical erosion, nutrient transport and rock/sediment formation, which is part of the sedimentary /rock cycle.
The types of biogeochemical cycles.

They can be grouped into three categories: -

I – The Hydrological cycle
II – The Gaseous Nutrient cycles
III – The Sedimentary element cycles

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marto answered the question on March 20, 2019 at 07:21