Under the elevated CO2 concentration,branches and number of roots ,release of exudates,absorption of nutrient elements by roots,mycorrhiza infecti on rate and biomass of plants were increased.

• 根的分枝和数量增多,根系的分 泌量和吸收能力可能增加,植物的生物量增加。对臭氧伤害的抗性增强。