关键词: 樟树, 组培苗, 轻基质, 容器规格, 空气切根, 缓释肥

Abstract: In order to promote the seedling nursery efficiency for the native broadleaf tree Cinnamomum camphora, 6 combinations of light substrates were designed for analyzing the effects of substrate composition, container size, air-cutting and slow-release fertilization on a genetically-selected clone of seedlings. The substrate compositions had significant influences on height (HT), basal diameter (BD), HT-to-BD ratio, SPAD value and survival rate. A single addition of vermiculite, perlite or sawdust into peat soil obviously improved the seedlings’ performance, and the synchronous supplement of both sawdust and perlite achieved the optimal results. While the complement of peat soil with coconut dust resulted in similar growth situation with 100% yellow soil, which was apparently inferior to other light substrates. Larger containers led to an increase in the growth traits, SPAD value and survival rate when compared with smaller ones, but had little impact on HT-to-BD ratio. Air-cutting induced an increment of basal diameter, an inhibition of main root extension, faster growth of lateral roots and fibrous roots, and occurrence of more developed root system. Slow-release fertilization up-regulated the height, HT-to-BD ratio and SPAD value, but exerted little influences on survival rate.

Key words: Cinnamomum camphora, tissue-cultured seedling, light substrate, container size, air-cutting, slow-release fertilization