Abstract: The air seeding effects in Pinus tabulaeformis Carr. Have been studied bythe way of variance analysis and quantitative gradual regression. The resultsshow that among many factors elevation, slope site, thickness of soil layerand slope gradient have combined influence on air-seeding effects. The mu-ltiple linear equation has been formulated by the relations between these fourcritical factors and aerial seeding effects, and the more satisfactory resultshave been obtained in the use of predicting air seeding effects. Therefore,this study will be very useful for choosing site conditions and evaluating sitequality of seeding area, and increasing aerial seeding effect, and also hascertain significance for predicting effect of aerial seeding at early stage.

Key words: Pinus tabulaeformis carr, Air-seeding effects, Site factors, Variance analysis, Quantitative gradual regression