Week 11: The Global Nitrogen Cycle, lecture material (pdf-file, two extra slides)

Reading assigment: Chapter 12 of the textbook: The Global Cycles of Nitrogen and Phosphorus

Notes:

• Domestic animals are the largest source of atmospheric ammonia, which gets mostly deposited on land in the regions of large animal facilities (Table 12.1) !
• Increased N-fixation via fossil fuel combustion (N₂ --> NO_x) has contributed much to air pollution (Table 12.2), still dwarfing the lightning source
• The global N₂O budget (Table 12.3) as evaluated/revised by the IPCC (2001) is here
• Confer to Figure 12.7 with regards to my comments on the feedback between NPP and nitrogen fertilization ("saturation" occurs)