Advances in the Studies on Salt Tolerance of Fruit Trees Advances in the Studies on Salt Tolerance of Fruit Trees Responses and Resistance Mechanism of Pinus massoniana under the Stresses of Simulated Acid Rain and Aluminum Study on Physiological and Biochemical Responses of Camellia oleifera to Low Phosphorus Stress Physiological and biochemical responses of Phaeodactylum tricornutum and Chaetoceros minutissimus to enhanced UV-B irradiation