This research uses the field test the method,take the Salix,Fraxinus Americana, Lonicera tatarica L.,Ligustrum obtusifolium Sieb.,Syringa oblate Lindl.,Forsythia suspense Vahl. and Lagerstroemia indica L. 7 kind of plant's two years lives the cuttage seedling as the object of study,studies them under the Tianjin nature salt alkaloid coercion its photosynthesis factor,the chlorophyll fluorescence parameter, the chlorophyll, malondialdehyde,super oxide dismutase,the organic osmotic regulation material and the...