不同生境条件下软紫草(Arnebia euchroma)结实特性的差异

The Differences on Fruiting Characteristics of Arnebia euchroma(Boraginaceae) in Different Habitats

对软紫草在自然生境及人工栽培条件下的结实结籽特性进行比较分析。结果表明：软紫草不同居群、同一居群的不同生境以及同一生境的不同年份，在结实特性上均表现出不同程度的差异。自然居群软紫草植株的花数、结实率、结1～2粒和3粒种子的花的频率分布、种子产量、结籽率及种子千粒重均远低于人工栽培居群，彼此间存在极显著差异；自然居群各样地植株的花数、结实率、结1粒和2粒种子的花的频率分布、种子产量及结籽率均表现为样地S1〉样地S3〉样地S2，种子千粒重表现为样地S1〉样地S2〉样地S3，其中，结实率、种子产量、结籽率和种子千粒重在各样地间存在极显著差异。不同年份中，自然居群样地S1植株的结实、结籽率无显著差异，但花数、种子产量和种子千粒重存在极显著差异；而栽培居群植株的花数、结实结籽率、单株种子产量存在极显著差异，种子千粒重存在显著差异。

The fruiting and seed-set characteristics on Arnebia euchrorna （Royle） Johnst （Boraginaceae） in natural habitat and artificial population were compared in this article. The results showed that the fruiting characteristics of A. euchroma had some differences between natural and artificial population, among different habitats of natural population and between different years in the same habitats, and the habitat factors had obvious influence on the fruiting and seed-set characteristics of A. euchroma. The flower numbers, fruiting rate, seedset rate and seed yield per plant, the frequency distribution of flowers producing one, two or three seeds, and 1 000-seed weight were far lower in natural habitat than that in artificial population and there was extremely significant difference between them. In natural population, it appeared S1 〉S3 〉S2 in the flower numbers, fruiting rate, seed-set rate and seed yield per plant, frequency distribution of flowers producing one and two seeds, and S1 〉S2〉S3 in 1 000-seed weight and there were extremely significant differences in fruiting rate, seed-set rate, seed yield and 1 000-seed weight among them in 2004. In S1 of natural population, there was no significant difference in the fruiting rate and seed-set rate and extremely significant differences in the flower numbers, seed yield and 1 000-seed weight between 2004 and 2005, but there were extremely significant differences in the flower numbers, fruiting rate, seed-set rate, seed yield and significant difference in 1 000-seed weight in artificial population between them.