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Canonical Analysis and the Principal Components Analysis of Plant Community with Its Environmental Factors in the Yellow River Delta Relationship between soil enzyme activities and trace element contents in Eucalyptus plantation soil Canonical Correlation Analysis of Physiological and Chemical Index in Leaves and Quality Characters in Chewing Cane Relationship between Periphyton Distribution and Water Quality of Gufu River of Three Gorges Reservoir Area Principal Component and Canonical Correlation Analysis of the Environmental Factors Influencing the Growth of Caragana korshinskii Kom. in Grassland