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Floral Syndrome and Insect Pollination of Liriodendr on chinense Pollen viability,stigma receptivity and pollinators of Weigela florida CORRELATION BETWEEN FLORAL TRAITS OF CHRYSANTHEMUM (DENDRANTHEMA MORIFOLIUM) AND INSECT VISITORS The Relations Among the Nectar Secretive Rhythms, Nectar Compositions and Diversities of Floral Visitors for Both Eleutherococcus senticosus and E.sessiliflorus Pollination Ecological Studies of Tamarix chinensis in the Middle Reaches of Heihe River and Yantai Seashore Effects of ecological educational on recreational impacts