不同遮荫水平下4个玉簪品种的生长性状分析

Growth characteristic analyse of shading levels on four Hosta Cultivars

研究了 4个玉簪品种 (Hosta‘GoldenEdger’ ,H .‘Antioch’ ,H .sieboldiana‘Elegans’ ,H .plan tagenea‘Aphrodite’)在全日照的5 0 %、30 %和 5 %条件下的生长性状 ,结果表明 ,4个玉簪品种的生长性状均受光照强度的影响 ,随遮荫程度的加深 ,所有供试品种的各生物量增量均表现下降 ,H .‘GoldenEdger’和H .plantagenea‘Aphrodite’对光照较H .‘Antioch’和H .sieboldiana‘Elegans’敏感 ,前二者的适合生长光强为全光照的 5 0 %以上 ,后两者适合生长的光强为全光照的 30 %～ 5 0 % ;光强对所有供试品种的单株总叶面积和株高均没有显著影响 ;各品种比叶重随光强减弱而下降 ;5 0 %以上遮荫不利于芽及花序的产生。遮荫还改变各品种器官间的生物量分配比例 ,5 0 %以上遮荫使根生物量比例减少 ,叶片生物量增加 ;随着遮荫程度的加深 ,所有供试品种的各器官干重的总体减少程度大于鲜重。

Four Hosta cultivars (respectively Hosta ‘Golden Edger’, H. ‘Antioch’, H. sieboldiana ‘Elegans’ and H. plantagenea ‘Aphrodite’ ) in three shading levels(respectively 50%, 30%and 5%full sun)were studied, results showed that growth characters of four Hosta cultivars at different light intensities were significantly affected. Accompanied with shading levels increasing, the plants’ increments of biomass decreased, H. ‘Golden Edger’ and H. plantagenea ‘Aphrodite’ were more sensitive than the others, the suitable light intensities for the former two were above 50%full sun, the latter two were 30%～ 50%full sun; The total leaf areas and heights of the plants were insignificantly influenced by light intensities; Specific leaf weight of four Hosta cultivars decreased. Over 50%shadings, all four Hosta cultivars had fewer buds and inflorescences. The proportion of different organs biomass distribution were also affected by shadings, over 50% shadings decreased root biomass proportion, but increased leaf proportion; With shadings increased, dry weights of all four Hosta culticars dropped quickerly than fresh weights.