The elevated atmospheric CO2 could directly affect photosynthesis and respiration, as well as carbon that was carried to roots, and finally the symbiosis of mycorrhizal fungi and plant roots.

• 摘要大气CO2浓度升高对植物的光合作用、呼吸作用等产生直接影响，进而影响到运送到根系中碳的量，菌根真菌也随之受到影响。