Effect of Simulated Acid Rain and Its Acidified Soil on the Biomass and Some Physiological Activities of Wheat Seedlings Effect of simulated acid rain and its acidified soil on lipid peroxidation of wheat seedlings Effects of acidification and CaCO3 application on various forms of manganese in soils A comparative study of resistance to soil acidification and growth of fine roots between pure stands of Pinus massoniana and Cinnamomum camphora