光照对3种针叶树种幼苗生长与根系发育影响的研究

以白皮松、油松和红皮云杉3个针叶树种1a生幼苗为对象,研究在100%全光(CK)、70%透光和40%透光3种光照下幼苗生长和根系发育规律,结果表明:不同光照条件下3个树种幼苗生长随时间变化存在不一致性,白皮松和油松高生长、地径生长均表现为全光照高于低光照处理,而红皮云杉在低光照处理下,其苗高和地径高于全光照。油松和红皮云杉根长、根系表面积、根系体积各时期发育,均表现出全光照70%透光40%透光趋势;而白皮松在根长和根系表面积方面,则为70%透光高于全光照和40%透光,在根系体积方面,全光照高于70%透光和40%透光。适度遮阴有利于白皮松幼苗生长,不利于油松幼苗生长,而红皮云杉幼苗对光照适应范围较宽。

The research of the effect of lighting on the seedling growth and root development of 3 coniferous species

The growth and root development law of seedlings under the condition of 100%light ( CK) , 70%and 40%light transmittance by choosing Pinus bungeana、Pinus tabulaeformis and Picea koraiensis of 3 coniferous species 1 a as the ob-ject.The results showed that it existed inconsistencies under different light conditions that three species seedling growth with time changes.The height and ground diameter growth of Pinus bungeana and Pinus tabulaeformis presented that full exposure treatment was higher than low-light illumination.However, the height and diameter of Pinus tabulaeformis under low light conditions was greater than full illumination.The each period of development of root length, root surface area and root volume of Pinus tabulaeformis and Picea koraiensis exerted full light>70% light transmission>40% light transmit-tance.The root length and root surface area of Pinus bungeana under light transmission was higher than the full exposure and 40%light transmittance.Furthermore, the root volume of Pinus bungeana under full light was higher than 70% light transmission and 40%light transmittance.The proper shading was beneficial to seedling growth.But it was suitable to the seedlings growth of Pinus tabulaeformis while the light adaptation range of Picea koraiensis was wide.