遮荫对山麦冬生长特性和生物量分配的影响

Effect of shading on growth characteristics and biomass distribution of Liriope spicata(Thunb.)Lour.

研究了不同遮荫水平（遮光率分别为：对照0％、20％、50％、70～75％、80～85％、92.5％）对山麦冬生长以及生物量分配特性的影响。结果表明，随着遮荫程度的加重，山麦冬的生物量增量表出现先上升后下降的趋势，在遮荫50％水平下生物量增量达到最高；随光强减弱同化物分配发生改变，叶重比增加，根重比和根冠比下降。此外，遮荫还提高了植株的含水量和冠径。我们还观察到强光环境和深度遮荫均不利于花序、分蘖和块根的形成。因此，我们认为山麦冬作为耐荫植物对光环境具有一定的适应能力，强光或严重遮荫均不利于其正常生长发育。

The effects of different shading levels （ shading levels were： control 0%, 20% , 50% ,70 - 75%, 80 - 85%, 92. 5% ） on growth characteristics and biomass distribution of Liriope spicata （Thunb.） Lour. were investigated. The results showed that, as shading increasing, biomass increments first increased, then decreased. In 50% shading levels, Liriope spicata （ Thunb. ） Lour. gained the largest biomass increments. Shading significantly affected the biomass distribution, as shading increasing, leaf weight ratio increased, while root weight ratio and root/shoot decreased. Moreover, shading increased the water contents of Liriope spicata （ Thunb. ） Lour. and its spreading. Neither high irradiance nor high shading levels were of significant benefit to form inflorescences, buds and root tubers in this study. We suggested that Liriope spicata （Thunb.）Lour, as a shade tolerance plant, was able to acclimate to a large radiation scale; however, high irradiance or high shading did certain harm to its growth.