Twenty years of net photosynthesis, climatic and anthropic factors from biomes of Bahia State, Brazil

The Brazilian biomes Atlantic Forest, Cerrado, and Caatinga are considered biodiversity hotspots in the world and are fundamental to the global and regional carbon balance. However, deforestation and/or burning and changes in land use and land cover have contributed to the increase of carbon dioxide (CO2) in the atmosphere as well as the consequent greenhouse effect and global warming. Net photosynthesis is a natural CO2 levels regulation process in the atmosphere and it is influenced by vegetation composition, climatic and anthropogenic factors. In this sense, this study aimed to evaluate the Net Photosynthesis (PSN) in 20 years in the Brazilian biomes Atlantic Forest, Cerrado, and Caatinga, to verify the monthly correlation between PSN and intervening factors, such as climatic variables and burned areas, as well as to determine trends of increase and decrease over the years of all variables studied. The study was based on eight-day MOD17 Net Photosynthesis images and the results showed that monthly PSN in the three biomes is more positively correlated (p-value