Bio-productivity
The bioproductivity of a land area, an ocean or an ecosystem characterizes the biomass that is generated there per unit of time and per unit of area.
It depends on various parameters such as water supply , surface or water temperature, photosynthetically active radiation, nutrient supply ( nitrate , nitrite , ammonia , phosphorus ), carbon dioxide content in the air and soil and biodiversity . It can be caused by human activities, e.g. B. by fertilization or irrigation, can be influenced positively or negatively.
Bioproductivity is based on two processes: primary biological production, i. H. the development of high-energy biomass from low-energy substances in the environment, and secondary production, d. H. the transformation of biomass into other forms in the course of its consumption. A distinction is made accordingly between gross and net organic production. The latter does not contain the biomass destroyed by life-sustaining combustion processes and other forms of consumption.
With increasing bioproductivity, the carbon dioxide content in the soil increases; this accelerates the weathering of carbonates (so-called carbonic acid weathering ).
In the case of marine ecosystems in particular, in addition to photosynthesis , which does not play a role in the deep sea, chemosynthesis ( chemotrophy ) is a possible source of energy.
See also
literature
- J. Coombs (Ed.): Techniques in Bioproductivity and Photosynthesis . Butterworth-Heinemann Ltd, 2nd edition 1986, ISBN 978-0080319988
Web links
- visualcapitalist.com December 1, 2018, Iman Gosh: Animation: The Heartbeat of Nature's Productivity