作者单位:Minist Transport, Tianjin Res Inst Water Transport Engn, Tianjin 300456, Peoples R China[1]Chinese Acad Sci, South China Bot Garden, Key Lab Vegetat Restorat & Management Degraded Ec, Guangzhou 510650, Guangdong, Peoples R China[2]E China Normal Univ, Sch Ecol & Environm Sci, Shanghai 200241, Peoples R China[3]