ABSTRACT
Fixation into Terrestrial Ecosystems...................................87 4.3 Regulation of Biological N
Fixation ............................................................90 4.4 Effects of Increased CO
on Symbiotic N
-Fixing Systems.........................91 4.5 Environmental Factors Influencing CO
Effects ...........................................93 4.5.1 Soil N Availability..............................................................................93 4.5.2 Soil Phosphorus Availability..............................................................94 4.5.3 Increased Temperature .......................................................................95 4.5.4 Water Stress........................................................................................96 4.5.5 Elevated Tropospheric Ozone ............................................................97
4.6 Expected Effects on Ecosystem N Availability.............................................99 4.7 Summary ......................................................................................................102 References ............................................................................................................103
