育苗基质对米老排容器苗生长及叶绿素荧光特性的影响

Effect of Media on Growth and Chlorophyll Fluorescence Characteristics of Mytilaria laosensis Container Seedlings

摘要:

为筛选米老排容器苗生长的最佳基质配方，研究了黄心土和轻基质不同配比对容器苗生长和叶绿素荧光特性的影响。结果表明，米老排苗高、地径和总生物量随轻基质比例的增加呈先增加后降低的趋势，且以T₅处理（黄心土∶轻基质=5∶5）达最大值，分别是对照的3.60、1.97和13.5倍。除主根长外，各处理的根系指标均大于对照。随轻基质比例的增加，米老排幼苗总根长、总根表面积、总根体积等均表现为先增加后减少的趋势，以T₅处理达到峰值；而根系平均直径则随轻基质的增加呈增大的趋势。T₅处理的初始荧光Fo最小、最大荧光Fm和PSⅡ最大光化学效率（Fv/Fm）最大，其光化学能力最强。因此，米老排容器苗在黄心土∶轻基质=5∶5中生长最优，建议推广轻基质比例为50%~60%的混合基质作为米老排容器育苗基质。

Abstract:

In order to screen out the optimal media formula for Mytilaria laosensis container seedling, the effect of different proportion of yellow soil and light media on the growth and chlorophyll fluorescence characteristics of container seedlings was investigated. The results showed that the seedling height, root diameter and total biomass tended to increase at first and then decrease with the increment of light media proportion, reaching up to the peak grown in T₅ media (yellow soil:light media=5:5), which were 3.60, 1.97 and 13.5 times more than those of control (yellow soil), respectively. Except of length of main root, the root indicators grown in all media were larger than those in control. With the increment of light substrate proportion, the total length, surface area and volume of seedlings root in all media increased at first and decreased later, and the peak appeared in T₅ media. The average diameter of seedling root generally increasd with the increment of light media proportion. Among all media, the initial fluorescence (Fo) of seedlings grown in T₅ was the smallest, and the maximum fluorescence (Fm) and PSⅡ maximum photochemical efficiency (Fv/Fm) in T₅ were the largest, showing the highest photochemical capacity. Therefore, the growth of M. laosensis container seedlings was the best in T₅ media (yellow soil:light media=5:5), it was suggest that the mixture media with 50%-60% of light media could be used as container nursery media for M. laosensis.