Effect of organic materials on respiration intensity of annual Malus. hupehensis Rehd. root system Effects of Low-temperature on Enzymes Activities of Nitrogen Metabollism and Free Amino Acids Contents in Root of Malus baccata Borkh. and Malus hupehensis Rehd. Seedlings Effects of Low-temperature on Enzymes Activities of Nitrogen Metabollism and Free Amino Acids Contents in Root of Malus baccata Borkh. and Malus hupehensis Rehd. Seedlings Two New Varieties of Malus hupehensis (Pamp.) Rehd. from Shandong Province