Biogeochemical cycles packet


What is the biogeochemical cycle?

The biogeochemical cycle refers to the movement of elements and compounds moving continuously between Earth and its organisms. The biogeochemical cycle involves the movement of elements and compounds among four major systems: (1) land and soil (lithosphere), (2) organisms (biosphere), (3) air (atmosphere) and (4) the ocean (hydrosphere).

What is geochemical cycling?

Geochemical cyclingrefers to the flow of elements through the Earth’s reservoirs; the term underlines the cyclical nature of the flow in a closed system. The standard approach to describing the geochemical cycling of elements between the Earth’s reservoirs is with the box models that we introduced previously in chapter 3.

Can cycling with the biosphere control the abundance of O2?

Simple comparison of these inventories tells us that cycling with the biosphere cannot control the abundance of O2in the atmosphere, because the inventory of O2is considerably larger than that of either CO2or organic carbon.

How much organic carbon is in the biosphere/soil/ocean system?

The total amount of organic carbon in the biosphere/soil/ocean system is estimated to be about 4000 Pg C (700 Pg C in the terrestrial biosphere, 2000 Pg C in soil, and 1000 Pg C in the oceans).

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