Evolution of the Earth's Environment and Closed Ecosystem

Proposition of Geophysiology

Abstract

Because of the existence of biosphere, the earth's environment and biosphere have formed a self-developed system maintaining habitability for biota, which is called the geophysiological system or Gaia. Carbon isotope records in sedimentary rocks imply that the ancient earth was not abiotic but, rather, has been in a state of global biotic saturation since almost 4 Gyr ago and that microbial photoautotrophs must have been fully operative almost 4 Gyr. This reveals that our environment has been under the influence of life since its early stage. Biological removal of CO₂ from the atmosphere and production of O₂ through H₂ O-splitting photosynthesis have made a large difference of the earth's environment from the other lifeless planets'. Biosphere and the earth's environment have interdependently evolved as a holistic system just like a living system.
We argue a new theory on evolution of the earth's environment, which is constructed upon a new life-view that a living system forms a self-developed and self-organized system so as to be satisfied with the principle of existence against the external disturbances. Thus, geophysiological researches are most appropriate for studies about evolution of the earth's environment. Studies on closed ecosystem must play very important roles upon geophysiology, because the earth itself is forming a huge closed ecosystem. Then we performed experiments using a microcosmic type closed ecosystem to investigate the property of the living systems like as the earth.
Our experimental ecosystem has been maintained for more than 400 days. The kinetic of oxygen concentration change depends on the length of dark period. And we get hints at further studying about interrelationships between homeostasis organized in the ecosystem and an increase in oxygen concentration, or about the meaning of the existence of animals in the ecosystems.