CHEN Zheng-fa1,XIA Qing2,SHI Dong-mei1,JIANG Guang-yi3,GUO Hong-zhong3 (1.College of Natural Resources and Environment,Southwest University,Chongqing 400715,2.Water Authority of Wansheng District in Chongqing City,Chongqing 400800,3.ChongqingMunicipal Environmental Monitoring Station of Soil and Water Conservation Ecology,Chongqing 401147)
