独花兰野生种群研究——开花与营养体状态的关系

Relationship between Flowering and Vegetative Status of Changnienia amoena Chien: A Field Population Study

对安徽省天堂寨自然保护区独花兰野生种群的花果期节律和营养体状态研究表明 ,开花植株占观察样本的 3 7 5 %,个体是否开花与假鳞茎数目、地下茎总体积和叶面积呈极显著相关关系。绝大多数开花个体具有 3个假鳞茎且其总体积通常达 8cm3,叶面积达 3 3cm2 。个体较大的植株开花持续期较长。花葶在花果期具有不同的生长时相 :开花期中止生长 ,幼果期呈逻辑斯谛型生长。面对日益增长的人类采掘风险 ,独花兰开花与大型植株的关联可能是其生活史中影响种群生存的脆弱点之一。

The vegetative status and the flowering and fruiting developmental rhythm of Changnienia amoena were investigated in Tiantangzhai population of Anhui province during the flowering and fruiting period. It did not flower until the plant has developed three pseudo_bulbs with a total volume of more than 8 cm 3 per shoot, and the leaves had a total area of more than 33 cm 2. Larger plants displayed a longer flowering duration. Scapes showed different growth phases during the flowering and fruiting period: discontinuing growth during flowering, and showing a logistic type of growth during young fruit development. The close correlation of flowering with large plants might be a vulnerable point in the life cycle of Changnienia amoena while facing increasing exploitation by human beings, which could threaten the survival of the species.