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Effects of NaCl stress on substances linked to osmotic adjustment and on photosynthetic physiology of Melilotoides ruthenica in the seedling stage Effects of NaCl Stress on Activities of Protective Enzymes, Contents of Osmotic Adjustment Substances and Photosynthetic Characteristics in Grafted Tomato Seedlings Influence of Bagging on the Structure of Apple Production Investment as Well as Its Resultant Problem of Shading Studies on the Physiological Characteristics of Drought Resistance in Winter Wheat Cold-tolerance of walnut cultivars: A comprehensive evaluation. Legislative Mode and Relative Problems of Nature Reserve Law in China Study on the Benefit and Risk of the Investment on the Commodity Forest Management Based on Forestry Policies THE DROUGHT RESISTANCE OF FOUR BROAD-LEAVED SPECIES IN THE NORTH OF CHINA WITH PV TECHNIQUE Effect of Drought Stress on Water Characteristics of Sabina vulgaris Studies on Adaptive Mechanism of Alfalfa in Drought Stress at Seedling Stage