几种混交树种根、叶对油松生长的影响

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。

tudies of the Relationship Between Pinus tabulaeformis and Some Tree Species of the Mixed Forest

Conducted studies of relationship between Pinus tabulaeformis and Amorpha frvticosa, Platycladus orientalir, Hippopha rhamnoides by means of experimental ecological method.The results show that root and leaf of these tree species has all positive effect on growth of P.tabulaeformis seedlings, of which the effect of A. fruticosa is the most significant,especially the effect on ground diameter growth of the seedings. Degree of the effect was strong affeCted by amount of the root or the leaf mixed in growing medium of POt culture. Root or leaf of these tree species has small effect on seed germination of P. tabulaeformis, but the effect on the seed vigor is most observable. The seed vigor decrees speedily with increment of soaking liquid content ofthe root or the leaf, of which the effect of the leaf on activity of dehydrogenase is greater than those from the root, especially the effect of H. rhamnoides leaf