Responses of winter wheat seedling growth and allelochemical content to elevated CO2 and O3 concentrations. Effect of NaHCO3 stress on uptake and transportation of Na+, K+ and Ca2+ in three shrub species. Effects of elevated O3 concentration and UV-B radiation on the chlorophyll content and active oxygen metabolism of soybean leaves. Effects of elevated O3 on  leaf litter decomposition and nutrient release of Quercus mongolica in city.