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Study of urban metabolic structure based on ecological network：a case study of Dalian CHANGES OF ULTRASTRUCTURE OF TISSUES IN FRUITS DURING RIPENING RELATIONSHIP BETWEEN MORPHOLOGY AND STRUCTURE OF LEAVES OF THE MAIN SAND-FIXED PLANTS IN MAO US DESERT AND ENVIRONMENT An Analysis of Age Structure and the Strategy for Asexual Propagation of Aneurolepidium chinense Population Ultrastructure of Chloroplast and Photosynthetic Properties of the Leaves at Different Position in Maize DEVELOPMENTAL ANATOMY ON THE STEM OF SINOMENIUM ACUTUM VAT. CINEREUM