无土基质立体栽培条件下半夏生物量分配格局

在大棚内3层4组立体设施条件下,分上、中、下各层次随机设置无土基质:沙 沙、谷壳 沙、树叶 沙、锯末 沙4种处理.研究不同基质对半夏(Pinellia ternate)各器官生物量分配的影响,探讨半夏总生物量在无性繁殖、有性生殖及营养器官中的分配规律.结果表明,不同基质中,设施上层沙 沙基质中根的生物量最高;谷壳 沙基质是半夏块茎生长较适宜的基质;树叶 沙基质不利于半夏块茎生物量的积累,却有利于珠芽形成及叶片的生长;花序的生物量只是在设施中层谷壳 沙基质中较高;不同基质对总生物量的影响与对块茎生物量的影响表现基本一致.单株半夏总生物量用于无性繁殖(块茎、珠芽)的生物量投入比例在设施下层锯末 沙基质中最高;树叶 沙基质中的有性生殖投入比例与其它基质比较,其生殖分配相对较高;用于总繁殖(无性繁殖、有性繁殖)的投入比例在锯末 沙基质中排序第一;在树叶 沙基质中,与同一层次的其它基质相比较,用于营养器官(根、叶)的生物量投入比例都处于最高水平.

Biomass Allocation Pattern of Pinellia ternate Planted in Different Vertical Soilless Media

In this papers,the effects of four different soilloss media on biomass and the allocation patterns of total biomass to vegetative propagation,reproduction,total propagation and vegetive organ of pinellia ternate were studied.The four soilless media used in the experiments were listed as sand sand, husk sand, tree leaf sand, sawdust sand, which were regarded as four treatments and every medium was arranged in three small areas that were set vertically in a greenhouse, i.e. upper, middle and lower layer. The results showed that: root biomass of single plant planted in the sand sand medium of upper level were maxium;Husk sand medium was suitable for the tuber growth; Tree leaf sand medium was not profitable for accumulation of tuber biomass, but it was beneficial for growth of bulbil and leaf; The inflorescence biomass of single plant was higher than that of showing in middle level by using husk sand medium; The effects of the different soilless media on total biomass were consistent with their effects on tuber biomass. The allocation of total biomass to vegetative propagation (tuber, bulbil) was the highest in lower level by using sawdust sand medium; reproduction allocation in tree sand medium was higher than that in other soilless media; in sawdust sand medium, the rate of total propagation biomass (vegetative propagation, reproductive propagation) to total biomass of single plant ranked first; compared with the ratio in others media, the ratio of vegetative organ biomass to total biomass was the highest in tree leaf sand media of the same level.