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percent of atmospheric carbon fixed by each land plants and phytoplankton per year

Range	6-8 percent per year
Organism	Biosphere
Reference	Kiang et al. Spectral Signatures of Photosynthesis I. Review of Earth Organisms. Astrobiology 2007. 7(1) p.223PubMed ID17407409
Primary Source	Cramer et al, Comparing global models of terrestrial net primary productivity (NPP): overview and key results. 1999, Global Change Biol. 5 (Suppl. 1), 1–15. Cramer et al. Global response of terrestrial ecosystem structure and function to CO2 and climate change: results from six dynamic global vegetation models. 2001. Global Change Biol. 7(4), 357–373. Reeburgh 1997 Figures summarizing the global cycles of biogeochemically important elements. Bull. Ecol. Soc. Am. 78(4), 260–267.
Entered by	Phil Mongiovi
ID	101685