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Effects of manganese concentrations on the chlorophyll fluorescence characteristics and growth of Karenia mikimotoi Effects of clonal integration on growth of invasive plant Alternanthera philoxeroides under two kinds of trampling stress Comparison of Leaf Photosynthetic Physiological Characteristics in Vive Carya illinoensis Varieties Effects of different day/night warming on the photosynthetic characteristics and chlorophyll fluorescence parameters of Sinocalycanthus chinensis seedlings