[Effect of atmospheric CO2 and temperature increment on crop physiology and ecology]

The effect of atmospheric CO2 and temperature increment on crop growth, photosynthesis, yield, and water and nutrient use efficiency was summarized and discussed in this paper. Under high CO2 concentration in the future, the photosynthetic rate of crops may be enhanced to some extent, and their biomass and yield may also be increased. Their stomatal conductance may be reduced, while water use efficiency (WUE) may be increased under elevated CO2 concentration. The aboveground biomass and root production, especially fine root production, will be greatly enhanced, and consequently, litter production increased, C/N ratios increased, plant litter decomposition rates declined under CO2 enrichment. Plants grown under elevated CO2 concentration may release more substrate into rhizosphere, which may lead to an increased activity of soil microorganisms, acclerated mineralization of nutrients, and improved nutritional status of the plant.