planting techniques on soil properties and survival rate of trees

Soil was improved by flue gas desulphurization from coalfired power plant and krilium before soil was filled into tree well, meanwhile, three different cushion rubbers were placed at the bottom of three well (haulm + sand, sand, cobblestone + sand). Soil pH, soil total salt content and tree survival rate were measured in this study. The results of this study showed that the average pH of different soil depths in the treatment plots decreased by 9.01%12.10% ( P＜0.01) , whereas that in the control plots increased generally, and soil pH of haulm + sand treatment was significantly lower than those of other treatments (P＜0.05). The average soil salt content of different soil depths in the treatment plots significantly decreased by 1.62%67.59% (P＜0.01), whereas those in the control plots increased by 22.37%58.21%, and soil salt content of haulm + sand treatment was lower than those of other treatments(P＜0.05). The survival rate of trees was no significant difference between three cushion rubbers at 45 d, 75 d, 165 d, respectively, whereas significant difference was observed between the treatment plots and the control plots (P＜0.01). The survival rate of Sophora japonica, Fraxinus chinensis, Picea crassifolia and Malus micromalus in the treatment plots increased by 28.7%31.1%, 88.3%112.6% , 46.0%48.0% and 26.5%33.6%, respectively when compared with the control plots.