Effects of elevated atmospheric CO2 and nitrogen application on cotton biomass, nitrogen utilization and soil urease activity. Effect of root-zone CO2 enrichment on tomato photosynthetic physiology. Near surface CO2 concentration and its quantitative relationship with character of underlying surface in Shanghai City, China. Effects of plastic film mulching on soil CO2 efflux and CO2 concentration in an oasis cotton field. Effects of elevated CO2 concentration on physiological characters of three dwarf ornamental bamboo species. Effects of drought stress, high temperature and elevated CO2 concentration on the growth of winter wheat.