IMPACTS OF URBAN RIVER RECONSTRUCTION ON NATIVE VASCULAR PLANTS IN A CHINESE RIVER ECOSYSTEM Beta diversity of wetland vegetation in the middle and upper reaches of the Fenhe River watershed Interrelation between Plant Species Diversity and Soil Factors in the Middle and Lower Reaches of Fenhe River Characteristerics of periphyton community in the source of Fenhe River, North China Phytoplankton diversity and off-flavor-producing Microcystis in the Taiyuan region of the Fenhe River