大叶醉鱼草居群、种子萌发特征及适应性的初步研究

通过对云南和四川交界地区大叶醉鱼草生物学特征的调查表明:该物种在野外条件下,其居群单株的平均分枝数、单株最大茎的平均直径、居群的平均高度与海拔呈显著相关,居群的平均花序(果序)长度、千粒种子平均质量与海拔相关性不明显。此外,该物种的种子萌发率(4年内)随储存时间的增加而升高,且对光照不敏感。最后,结合研究结果讨论了大叶醉鱼草在国外能成为外来入侵种,而在国内没有产生危害的原因。

A Preliminary Study on Population, Seed Germination Characters and Adaptability of Buddleja davidii Franch.

The biological characters of wild Buddleja davidii populations were investigated in vicinal region of Sichuan and Yunnan provinces.The result suggested the average branch,numbers of individual,the average diameter of the biggest stem of individual in population and the average height of population showed distinct pertinence as altitude change.However,the average inflorescence(infructescence) length of population and the average quality of 1000 seeds showed little pertinence as altitude change.Furthermore,germination percentage of B.davidii enhanced as deposited time increase in four years.Light has a minor effect on germination percentage.Finally,the reason why B.davidii can become an invasive species in some other countries and may not endanger native biodiversity was discussed according to the present results.