Nitrogen
- What is the magnitude of the nitrogen fixation rate in major biomes?
- How much of this fixation is deterrnined by natural processes
unaffected by man, and how much is under advertent or inadvertent control of humans?
- How is the fixation reate changing?
- Are stores of nitrogen in major soil systems deteriorating?
- What effect does anthropogenic nitrogen have on rivers and coastal biomes?
- Have NO, NO2, and N2O emissions from combustion and agricultural soils enhanced
global concentrations of these gases?
- If so, what effects may be expected on other important species, such as troposphenc ozone?
