土壤基质和芽体大小对水鳖冬芽萌发及早期生长的影响

Effects of Winter Bud Size and Soil Matrix on Germination and Early Growth of Hydrocharis dubia(Blume)Backer

为了弄清楚影响浮叶植物水鳖的早期生活的潜在因素,设计了一个3×2因子的室外实验来研究基质和冬芽对水鳖早期生活阶段的影响,即实验用的冬芽分成小、中、大3组,让它们分别在2种不同的土壤基质(沙、泥)中生长.实验结果表明,在相同的基质中,随着冬芽的不断增大,水鳖的萌发率、不同器官(根、茎、叶、叶柄)生物量和总生物量等都有相应的提高;相对来说,大的冬芽和沙基质有利于水鳖早期的萌发、构建和生存,而大的冬芽和泥基质则有利于萌发后水鳖的生长;生物量倾向于根部的分配方式,有利于植物度过不利的环境而更有利于它的生存.

The effects of winter bud size and soil matrix on the emergence and size of the fluitante Hydrocharis dubia （Blume） Backer was investigated in an outdoor experiment in order to determine the underlying factors affecting its persistence at early life history stages. Winter buds were sampled and sorted into three groups （small, medium, and large） and buried in plastic pots with unsterilized sand and mud sediments respectively. Percent emergence, total plantbiomass and plant height were relatively enhanced by winter bud size in the same sediment, increasing with increasing winter bud size. The large winter buds and sand sediments had a greater the early plant emergence, establishment and survivorship compared to small ones and mud sediments. The results indicate that large winter buds and mud sediments might favor the later survivorship of the immature plant. Allocation to root appears to enhance the ability of immat-ure plants to survive unfavorable conditions.