Effects of copper toxicity on photosynthesis and transpiration of three Elsholtzia splendens Nakai ex F.Maekawa populations Effects of arbuscular mycorrhizal fungi inoculation on the photosynthetic pigment contents, anti-oxidation capacity and membrane lipid peroxidation of Elsholtzia splendens leaves under copper stress Effects of soil microbe inoculation on the growth and photosynthetic physiology of Elsholtzia splendens under copper stress Cu hyperaccumulators in mining area Effects of Soil Microbes on Photosynthetic Characteristics and Chlorophyll Fluorescence Parameters of Elsholtzia splendens under Copper Stress Condition