分株和遮荫对花叶芒生长的影响

 盆栽条件下研究了分株和遮荫对观赏植物花叶芒(Miscanthus sinensis‘Variegatus’) 生长的影响, 为种苗快速扩繁和应用配置提供技术依据。分株试验有4个处理, 初始分蘖数分别为2～3、5～6、10～12和20～23个/盆, 结果表明初始分蘖数对植株生长有明显影响, 分株生长6个月后, 植株的茎数、花序数、冠幅和地上生物量随初始分蘖数的增加而显著提高, 但对植株高度没有影响。初始分蘖数为20～23个/盆时, 繁殖系数最低, 仅为2.1, 而初始分蘖数为2～3个/盆时繁殖系数最高, 为6.7, 是前者的3.2倍。通过覆盖不同层数的黑色尼龙网形成了4个遮荫度, 分别为0, 25% , 50%和75%。遮荫度对花叶芒的生长有显著的影响, 25%~50%遮荫度下, 花叶芒的株高、茎数、花序数、地上和地下生物量以及叶绿素含量都显著高于全光照条件下的, 但遮荫度增加到75%时, 这些指标又明显降低, 由此得出25% ～50%的遮荫度适合花叶芒生长, 高于50%的遮荫度不利于其生长。

Influences of Division Size and Shade Density on the Growth of Miscanthus sinensis (Anderss) ' Variegatus'

Pot experiments were conducted to determine appropriate division size and to understand the effects of shading density on Miscanthus sinensis (Anderss) ' Variegatus'. Plants from 4 initial division sizes, of 2-3, 5-6, 10-12 and 20-23 tillers, were evaluated following a complete growing season. It was indicated that number of shoots and inflorescences, crown size and shoot biomass increased significantly with increased initial division sizes, but plant height was not affected by initial sizes. However, division of 2-3 tillers produced 3.2 times as many new shoots per initial tiller as did 20-23 tiller division. Plants of Miscanthus sinensis " Variegatus' were grown under shading densities of 0, 25%, 50% and 75% provided by polypropylene shade cloth. At shading densities of 25%-50%, shading increased plant height, shoot and inflorescence number, shoot and root biomass, as well as chlorophyll content, but at high shading density of 75%, all these measurements decreased. So 25% -50% shading is recommended for planting and production of Miscanthus sinensis (Anderss) ' Variegatus'.