Effects of Magnesium Deficiency on Growth and Active Oxygen Scav􀀁enging System in Cucumber under Different Light Intensities Photosynthetic Characteristics of Phalaris arundinacea Linn. in Flood Plain Grassland of Zhenjiang Recovery of vegetation in subtropical monsoon evergreen broad -leaved forestⅠ.Principle:Response of Photosynthesis of plants on different disturbed forestlands to environmental factors Effects of Magnesium Deficiency on Growth and Active Oxygen Scav􀀁enging System in Cucumber under Different Light Intensities