Effects of fertilization on the relative competitive ability of Eupatorium adenophorum and Lolium perenne at their seedling stage
施肥对苗期紫茎泽兰和黑麦草相对竞争力的影响

To test the suppressive ability of replacement species Lolium perenne on invasive alien species Eupatorium adenophorum,a field experiment was conducted to study the effects of applying fertilizers N and P on the relative competitive ability and growth performances of these two species at their seedling stage.The results showed that the competitive ability of E.adenophorum was enhanced after applying N and P as measured by the relative competition intensity(RCI),while that of L.perenne was only slightly enhanced with the application of P.However,L.perenne was more competitive than E.adenophorum under any treatments of fertilization.Fertilizer N increased the plant height,branch number,and dry biomass of E.adenophorum significantly,and only high application rate of fertilizer P increased the dry biomass.The tiller number of L.perenne was increased but its dry biomass was unchanged under the higher application rates of N,while the dry biomass was increased significantly by the higher application rates of P.E.adenophorum was not sensitive to the application rates of P in its energy allocation as measured by the root/shoot ratio.It was suggested that more application of P and no or less application of N could enhance the replacement of E.adenophorum by L.perenne.