Influences of enhanced ultraviolet radiation(UV B,280～315nm)on population quantity dynamics of weeds,soil macroanimals and wheat aphids in the wheat field ecosystem were investigated,Under UV B radiation,species number and population quantity of weeds and soil macroanimals decreased,species diversity changed,total biomass of weeds reduced.UV B radiation decreased population quantity of wheat aphids,which were significantly correlated with HCel,soluble protein content,CHO and the concentrations of Mg and ...