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运用实验生态学方法对紫穗槐、侧柏、沙棘与油松种间关系的研究结果表明，这几种混交树种的根、叶对油松苗木的生长均有不同程度的促进作用，其中紫穗槐的这种作用最为显著，尤其是对直径生长的促进作用，其作用程度强烈地受到混拌和浇灌入盆栽基质中根、叶量的影响。混交树种对油松种子的发芽力影响不大，但对种子活力的影响却十分明显，种子活力随浸种根、对浸提液浓度的增加而锐减，其中叶对种子体内脱氢酶活性的抑制作用显著大于根的作用，特别是沙棘对的这种作用。
The results of experimental ecological research on the relationship between Amorpha fruticosa, Platycladus orientalis, Seabuckthorn and Pinus tabulaeformis showed that the roots and leaves of these mixed tree species all promoted the growth of Pinus tabulaeformis seedlings to varying degrees, This effect of Acacia confusa was the most significant, especially for the promotion of diameter growth. The degree of its action was strongly influenced by the mixing and watering of roots and leaves into potting medium. Mixed tree species had little effect on the seed germination of Pinus tabulaeformis seeds, but had a significant effect on the seed vigor. The seed vigor decreased with the increase of the extract concentration, and the activity of the dehydrogenase Inhibition was significantly greater than the role of roots, especially the sea buckthorn pairs of this effect.