Taking a typical plain agricultural landscape in Fengqiu County,Henan Province as the study area,the relationships of the abundance of amphibians and their single adult species with environmental conditions at both habitat and landscape scales with four dispersal abilities(250,500,1000 and 2000 m) were explored with the support of redundancy analysis(RDA).The explanatory variables were separated into three categories: habitat characteristics variables[chemical oxygen demand( COD),NH3-N,total phosphorus( TP)...