Land plants equilibrate O2 and CO2 concentrations in the atmosphere

  title={Land plants equilibrate O2 and CO2 concentrations in the atmosphere},
  author={Abir U. Igamberdiev and Peter John Lea},
  journal={Photosynthesis Research},
The role of land plants in establishing our present day atmosphere is analysed. Before the evolution of land plants, photosynthesis by marine and fresh water organisms was not intensive enough to deplete CO2 from the atmosphere, the concentration of which was more than the order of magnitude higher than present. With the appearance of land plants, the exudation of organic acids by roots, following respiratory and photorespiratory metabolism, led to phosphate weathering from rocks thus… 
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