Pb,Zn single stresses of 200(P1,Z1),400(P2,Z2),600(P3,Z3),and 800(P4,Z4)mg/kg and composite stresses of 100+100(M1),200+200(M2),300+300(M3),and 400+400(M4)mg/kg were set in this study using the potted seedlings of Magnolia officinalis subsp.biloba,and no Pb,Zn treatment...MORE Pb,Zn single stresses of 200(P1,Z1),400(P2,Z2),600(P3,Z3),and 800(P4,Z4)mg/kg and composite stresses of 100+100(M1),200+200(M2),300+300(M3),and 400+400(M4)mg/kg were set in this study using the potted seedlings of Magnolia officinalis subsp.biloba,and no Pb,Zn treatment a...